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| WIRELESS COMMUNICATIONS DIVISION VDD TQ9203 Mixer IF out Mixer RF In Mixer LO In DATA SHEET LNA IN0 Select LNA IN1 Low-Current Cellular Band Downconverter IC LNA out GND LO Tune Features +5-V single supply Internal buffer amplifier on mixer LO port Product Description The TQ9203 RFIC Downconverter is a multifunction RF front end designed for the high dynamic range cellular communications standards. The design of the TQ9203 provides a 2.5dB system noise figure for excellent sensitivity, and a good signal range with -10dBm input IP3. Its low current consumption, single +5V operation and small, plastic surface-mount package are ideally suited for cost-competitive, spacelimited and portable applications. In addition, two selectable RF inputs simplify implementation of " antenna diversity"in applications such as CDPD. The TQ9203 is specified over a RF frequency range of 800 to 1000MHz, and therefore may be used for any of the cellular and cordless telephony standards. Electrical Specifications1 Parameter Frequency Gain Noise Figure Input 3rd Order Intercept DC supply Current Note On-chip matching to 50 Two selectable RF inputs Low-cost SO-14 plastic package 21dB system gain -10dBm typical input intercept point 2.5dB typ. system noise figure 10.5mA typ. operating current Min 800 Typ 21.0 2.5 -10.0 10.5 Max 1000 Units MHz dB dB dBm mA Applications Cellular Communications Spread-Spectrum Receivers Cordless Phones 1. Test Conditions: Vdd=5V, Ta=25C, filter IL=3.0dB, RF=881MHz, LO=966MHz, IF=85MHz, LO input=-6dBm 2. Specified with external noise-matching circuit elements, with image-stripping BPF IL=3dB 3. Frequency separation of the two signals is 500KHz; BPF IL=3dB Electrical Characteristics For additional information and latest specifications, see our website: www.triquint.com 1 TQ9203 Data Sheet Parameter RF Frequency LO Frequency IF Frequency LO input level Supply voltage Gain (LNA IN1) Gain (LNA IN0) Noise Figure Input 3rd Order Intercept Return Loss LO=-6dBm, RF=-35dBm LO=-6dBm, RF=-35dBm LNA IN0 Pin; SSB LNA IN1 Pin; SSB Frequency Sep. = 500KHz Mixer RF input Mixer LO input LNA OUT Return Loss Supply Current Note Conditions Tuned external match Tuned external match Tuned external match Min. 800 700 30 Typ/Nom Max. 1000 1300 300 Units MHz MHz MHz dBm V dB dB dB -6 4.5 18.0 5.0 21.0 21.0 2.8 2.5 -10.0 10 10 20 10.5 12 3.0 5.5 dB dBm dB dB dB mA 1. Test Conditions:, Vdd=5.0V, Ta=25C, filter IL=3.0dB, RF=881MHz, LO=966MHz, IF=85MHz, LO input=-6dBm: unless otherwise specified. 2. Conversion gain, noise figure, and IP3 assume an image stripping band-pass filter between the LNA section and the Mixer section with a 3dB insertion loss. Electrical Characteristics-LNA section only Parameter Gain Noise Figure Input 3rd Order Intercept Output Gain Compression Off Isolation, LNA In1/Out Off Isolation, LNA In0/Out Reverse Isolation Supply Voltage Supply Current Note Conditions RF=-40dBm LNA0 Active LNA1 Active Separation: 500KHz Select=0V, LNAo On Select=5C, LNA1 On Min. Typ/Nom 18.0 2.1 1.8 +13.0 1.5 -7 -5 38.0 Max. Units dB dB dB dBm dBm dB dB dB 4.5 Mixer Off(2) Powered down 5.0 8.8 5.5 V mA 1. Test Conditions:, Vdd=5.0V, Ta=25C, RF=881MHz. 2. Vdd pin supplies connect to both the LNA and the LO buffer amps. Mixer cannot operate without Vdd connection. Mixer Vdd through the IF pin connects only to the mixer FET. 2 For additional information and latest specifications, see our website: www.triquint.com TQ9203 Data Sheet Electrical Characteristics- Mixer section only Parameter Conversion Gain Noise Figure Output 3rd Order Intercept Mixer RF Return Loss Mixer LO Return Loss LO Input Power LO to IF Isolation LO to RF Isolation RF to IF Isolation Supply Current Conditions Min. Typ/Nom 0 12.0 10.0 15.0 10.0 -6.0 40.0 5.0 40.0 4.0 Max. Units dB dB dBm dB dB dBm dB dB dB mA Note 1: Test Conditions:, Vdd=5.0V, Ta=25C, filter IL=3.0dB, RF=881MHz, LO=996MHz, IF=85MHz, LO input=-6dBm: unless otherwise specified. -Absolute Maximum Ratings Parameter DC Power Supply RF Input Power Operating Temperature Storage Temperature Value 8.0 +10 -40 to 85 -55 to 150 Units V dBm C C For additional information and latest specifications, see our website: www.triquint.com 3 TQ9203 Data Sheet Typical Performance Test Conditions (Unless Otherwise Specified): Vdd=5.0V, Ta=25C, filter IL=3.0dB, RF=881MHz, LO=996MHz, IF=85MHz, LO input=-6dBm Conversion Gain vs. Freq. vs. Temp. 23 22 21 20 19 18 17 16 15 14 LNA Performance Noise Figure vs. Freq. vs. Temp. 3 2.5 Noise Figure (dB) -40C +25C +85C 2 1.5 1 0.5 0 +85C +25C -40C 869 872 875 878 881 884 Freq. (MHz) 887 890 893 Gain (dB) 869 872 875 878 881 884 887 890 893 Freq. (MHz) Input IP3 vs. Freq. vs. Temp. -6 -7 Input IP3 (dB) -8 -9 -40C +25C +85C Gain (dB) 19 18 17 16 15 14 13 12 869 872 875 878 881 884 Freq. (MHz) 887 890 893 869 872 LNA Performance Gain vs. Freq. vs. Temp. -10 -11 -12 -40C +25C +85C 875 878 881 884 Freq. (MHz) 887 890 893 Noise Figure vs. Freq. vs. Temp. 4 3.5 Noise Figure (dB) 2.5 2 1.5 1 0.5 0 869 872 875 878 881 884 887 Freq (MHz) +85C +25C -40C 890 893 Input IP3 (dB) 13.5 13 12.5 12 11.5 11 869 872 875 LNA Performance IP3 vs. Freq. vs. Temp. 3 -40C +25C +85C 878 881 884 Freq. (MHz) 887 890 893 4 For additional information and latest specifications, see our website: www.triquint.com TQ9203 Data Sheet LNA Performance Gain vs. Vdd vs. Freq. 17.5 17 Gain (dB) 16.5 16 820MHz 881MHz 947MHz Noise Figure (dB) 14 13 12 11 10 9 8 4 4.5 5 Vdd (V) 5.5 6 869 872 Mixer Performance Noise Figure vs. Freq. vs. Temp. 15.5 15 14.5 -40C +25C +85C 875 878 881 884 Freq. (MHz) 887 890 893 LNA Performance IP3 vs. Vdd vs. Freq. 16 15 Output IP3 (dB) 14 13 12 11 10 9 8 4 4.5 5 Vdd (V) 5.5 6 820MHz 881MHz 947MHz Input IP3 (dB) 11 10 9 8 7 6 5 4 869 872 875 Mixer Performance IP3 vs. Freq. vs. Temp. -40C +25C +85C 878 881 884 Freq. (MHz) 887 890 893 Mixer Performance Gain vs. Freq. vs. Temp. 6 5 Gain (dB) 4 3 2 1 0 869 872 875 878 881 884 Freq. (MHz) 887 890 893 -40C +25C +85C Gain (dB): Input IP3 (dBm) 10 9 8 7 6 5 4 3 2 1 0 -8 Mixer Performance Gain vs. Input IP3 vs. LO Power Gain 881MHz IP3 881MHz -6 -4 -2 LO Power (dBm) 0 For additional information and latest specifications, see our website: www.triquint.com 5 TQ9203 Data Sheet LNA0 S-Parameters, VDD=5.0V Freq 800 825 850 875 900 925 950 975 1000 |S11| 0.76 0.75 0.74 0.73 0.72 0.71 0.71 0.70 0.70 |S21| 4.30 4.42 4.50 4.54 4.58 4.57 4.53 4.50 4.43 |S12| 0.0033 0.0034 0.0038 0.0044 0.0047 0.0051 0.0054 0.0056 0.0062 |S22| 0.25 0.16 0.10 0.05 0.07 0.12 0.18 0.23 0.29 LNA1 S-Parameters, Vdd=5.0V Freq 800 825 850 875 900 925 950 975 1000 |S11| 0.82 0.82 0.82 0.81 0.81 0.80 0.80 0.79 0.79 |S21| 4.55 4.70 4.82 4.92 4.97 5.00 4.99 4.97 4.94 |S12| 0.0058 0.0061 0.0067 0.0069 0.0075 0.0078 0.0079 0.0078 0.0085 |S22| 0.30 0.23 0.16 0.09 0.03 0.05 0.11 0.16 0.21 LNA0 Noise Parameters, Vdd=5.0V Freq (MHz) 820 881 915 947 LNA1 Noise Parameters, Vdd=5.0V Rnoise ( ) 40.1 40.0 39.9 39.9 Fmin (dB) 1.51 1.54 1.57 1.60 opt (mag) 0.65 0.65 0.64 0.64 opt (ang) 26.5 29.0 30.5 32.0 Freq (MHz) 820 881 915 947 Fmin (dB) 1.30 1.33 1.36 1.39 opt (mag) 0.67 0.66 0.66 0.66 opt (ang) 27.4 30.4 31.5 32.7 Rnoise ( ) 38.9 39.9 39.9 38.7 6 For additional information and latest specifications, see our website: www.triquint.com TQ9203 Data Sheet Mixer S-Parameters, 5.0V Freq (MHz) 700 750 800 850 900 950 1000 1050 1100 RF IN |S11| 0.36 0.36 0.35 0.34 0.33 0.34 0.40 0.39 0.39 RF IN LO IN |S11| 0.21 0.19 0.17 0.15 0.13 0.17 0.26 0.33 0.31 LO IN Mixer S-Parameters, 5.0V Freq (MHz) 50 75 100 125 150 175 200 225 250 Mixer IF Out |S11| 0.993 0.991 0.991 0.994 0.995 0.995 0.994 0.994 0.994 Mixer IF Out For additional information and latest specifications, see our website: www.triquint.com 7 TQ9203 Data Sheet Application/Test Circuit C5 R2 Vdd C8 L5 Mixer LO In 1 2 R1 Vdd C3 3 4 5 C1 RF In L1 7 8 6 9 LNA out 14 L3 13 12 11 10 L4 Mixer RF In C7 C6 Mixer IF Out Bill of Material for TQ9203 Receiver Application/Test Circuit Component Receiver IC Capacitor Capacitor Capacitor Capacitor Inductor Inductor Resistor Reference Designator U1 C1 C3, C8 C5, C6 C7 L1, L3, L4 L5 R1, R2 Part Number TQ9203 1.5pF 0.01F 33pF 5.6pF 12nH 470nH 10 ohm Value Size SO-14 0402 0402 0402 0402 0402 0402 0603 Manufacturer TriQuint Semiconductor *Component values for L5, C6, and C7 depend upon the IF frequency and the IF filter impedance. R1 and R2 are optional. Here they are chosen for an 85MHz IF and 50W load. 8 For additional information and latest specifications, see our website: www.triquint.com TQ9203 Data Sheet TQ9203 Product Description The TQ9203 efficiently integrates a low-noise amplifier and high-intercept mixer, with performance equal to a discrete implementation, though use of circuit techniques from monolithic and discrete design practices. The LNA consists of two cascaded common-source amplifier stages, using a " DCstacked"topology, in which the same DC current flows through both stages. An external noise match is used to achieve optimum noise figure. Matching is performed with PC board microstrip lines or lumped-elements surface-mount components, using simple, well understood networks. The output on-chip impedance is matched to 50 ohms. The mixer is implemented as a " cascode"stage operating like a dual-gate FET mixer. A common-gate LO buffer provides the necessary gain to drive the mixer FET gate and establishes a good input match. The on-chip buffer amplifier allows for direct connection to a commercial VCO at drive levels down to -6dBm. An " open collector"IF output allows for flexibility, matching to various Ifs and filter types. The two topologies efficiently use the supply current for lowpower operation, approximately 10mA with a 5V supply. The overall circuit provides a distinct performance edge over silicon monolithic designs in terms of input intercept, noise figure and gain. Specifically, the circuit was intended for use in the following applications: cellular (AMPS, NADC, GSM, JDC, ETACS, etc.) and ISM band (902 - 928MHz). In addition, two selectable LNA inputs are available. They are implemented through the use of two independent first stages, each connected to the second-stage input. A SELECT pin controls which input is active by steering the current through the selected input stage and cutting it off from the other. This provides the optional functionality of a diversity switch in front of the LNA, but without the insertion loss and noise figure penalty from the switch. Power Supply Connection The TQ9203 was designed to operate within specifications over the power supply range of 4.5 to 5.5V, although it will function over a range of 4.0 to 6.0V. The internal biasing maintains stable operating points with varying supply voltage. However, the electrical parameters do vary slightly with supply voltage. Internally, the downconverter has 50pF of capacitance from Vdd to ground for RF decoupling of the supply line. This should be augmented with additional decoupling capacitance: 1000pF connected externally within 5mm of the package pin. A 10-ohm series resistor in the Vdd line may also be added (optionally) to provide some filtering of supply line noise. Connections to ground should go directly to a low-impedance ground plane. Therefore, it is recommended that multiple via holes to the ground plane occur within 2mm on the inside of the package pins. LNA Input Interfacing The TQ9203 LNA was designed for low-noise operation. It makes use of an optimum noise-matching network at the input, not a conjugate match, as would be used for maximum power transfer (although gamma optimum is near the conjugate match). Gamma optimum is referenced from the LNA input into the noise-match network in series with 50 ohms. The gamma optimum and the noise parameters for selected frequencies are shown in the LNA Noise Parameters table. There are several options for the physical realization of gamma optimum: a series-shunt microstrip transmission line network, a series capacitor/shunt inductor, and a series inductor. Ideal values for these components are included in the Noise Parameters table. The microstrip transmission lines can easily be constructed on FR-4 or G-10 circuit boards, using standard design techniques. The lumped-element components are surface-mount elements designed for RF use. Slight adjustments in the actual values of the elements are likely, due to the effects of component parasitics. It is important that the board-level circuit establishes an impedance of gamma optimum, measure at the solder pad of pin 6. Proper board design for gamma optimum eliminates the need for tuning adjustments and produces a low-noise circuit, which is tolerant of component variations. Operation Please refer to the test circuit above. For additional information and latest specifications, see our website: www.triquint.com 9 TQ9203 Data Sheet LNA Output (Pin 9) The LNA output is internally matched to 50 ohms over the 800 to 1000MHz frequency band and it is internally DC-blocked. Therefore, direct connections may be made to pin 9. Mixer RF Input The mixer RF input is matched close to 50 ohms and is internally DC-blocked. Pin 11 may be directly connected to the filter output. The filter must be as close as possible to the mixer RF input to maintain the proper termination impedance at the LO frequency. Include a shunt inductor of 22nH at the mixer RF input to improve the mixer noise performance by providing a short to ground at the IF frequency. This provides a secondary benefit of slightly improved input match. Mixer LO Input The mixer LO input is matched close to 50 ohms and is internally DC-blocked. Pin 1 may be directly connected to the LO input signal. A level greater than -6dBm is recommended. Standard VCO outputs of -2dBm work well. LO Tuning (Pin 13) L1 Mixer IF Interfacing The mixer IF port is a high-impedance, open-drain output. The impedance is a few K ohms in parallel with less than 1pF capacitance. The IF port S-parameters (S11) are listed in the table over the frequency range of 45MHz to 250MHz. It is possible to use Ifs above and below this range: however, at low frequencies the noise increases, and at high frequencies the LO/IF, RF/IF isolation decreases. The open-drain output permits matching to any chosen filter impedance. In general, a conjugate impedance match is recommended on this port to achieve best power gain, noise figure and output 3rd-order intercept. It is also important to properly center the tuned circuit at the desired IF. This maximizes circuit robustness to component tolerances. For proper mixer operation, pin 14, the open-drain output, must also be biased to Vdd. A practical matching network, which includes biasing, is shown. Vdd A shunt L on pin 13 resonates with some internal capacitance to produce a bandpass frequency response of the LO buffer amplifier. This attenuates noise at +/- one IF frequency away from the LO frequency. The approximate value of L is determined by the following equation: L=1/C (2f)2, where C=2.2pF TQ9203 14 C1 C2 Z Load 13 In practice, the value (and/or placement) of L should be empirically determined for a particular layout, since stray capacitance on the PCB layout can move the resident frequency from the expected ideal. The actual value of L should be adjusted until the buffer response (pin 1-> pin 13) produces a peak at the LO frequency. A measurement of the response may be accomplished with a simple coaxial probe " sniffer,"in which the end is positioned 50 - 100 mils from the inductor at pin 13. The frequency response of the LO buffer amplifier (pin 13) is directly measured on the network analyzer as the LO input (pin 1) is swept in frequency. The LO drive level should be set at approximately the operating level (-6 to 3dBm) for this measurement. This " tuning"needs to be done only in design, not in production. Vdd L1 C2 L2 TQ9203 14 C1 Z Load 13 10 For additional information and latest specifications, see our website: www.triquint.com TQ9203 Data Sheet Package Pinout Mixer LO input 1 2 3 4 5 6 7 TQ9203 14 Mixer IF Output GND 13 LO Tune 12 GND 11 Mixer RF Input Vdd LNA IN0 Select 10 GND 9 8 LNA Output LNA IN1 GND GND Pin Descriptions Pin Name Mixer LO IN Vdd LNA IN0 Select LNA IN1 LNA Out Mixer RF IN LO Tune Mixer IF Out GND Pin # 1 3 4 5 6 9 11 13 14 2,7,8, 10,12 Description and Usage Buffered LO port. There is an internal DC block on this port, which is matched to 50. Supply voltage for bias circuitry and LNA. This pin draws 8mA, typically. Decouple with 0.01uF within 0.25 inch of package. LNA IN0 is an auxiliary input and has characteristics similar to the LNA IN1 input port. Best performance is achieved with external noise-matching network. Internally DC blocked. Input port selection switch. CMOS-compatible drive, switches input ports from LNA IN1 to LNA IN0. Low=IN0, High=IN1. LNA IN1 is the primary input port. Best performance is achieved with external noise-matching network. Internally DC blocked. Output port from switched LNA section. Internally matched to 50. Internally DC blocked. Mixer RF Input port. Image stripping band pass filtering before Mixer section improves noise and spurious performance. No return to ground is required. Shunt L recommended for IF suppression. LO buffer tuning, inductor to ground. Mixer IF signal port. Open " collector-"type output requires connection to Vdd and impedance matching to load. Ground connection. Keep physically short for stability and performance. Use several via holes immediately adjacent to the pins down to backside ground plane. For additional information and latest specifications, see our website: www.triquint.com 11 TQ9203 Data Sheet Package Type: SO-14 Plastic Package Additional Information For latest specifications, additional product information, worldwide sales and distribution locations, and information about TriQuint: Web: www.triquint.com Email: info_wireless@tqs.com Tel: (503) 615-9000 Fax: (503) 615-8900 For technical questions and additional information on specific applications: Email: info_wireless@tqs.com The information provided herein is believed to be reliable; TriQuint assumes no liability for inaccuracies or omissions. TriQuint assumes no responsibility for the use of this information, and all such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. TriQuint does not authorize or warrant any TriQuint product for use in life-support devices and/or systems. Copyright (c) 1998 TriQuint Semiconductor, Inc. All rights reserved. Revision F, March 23, 1999 12 For additional information and latest specifications, see our website: www.triquint.com |
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