5 - 14 12 elizabeth drive, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 web site: www.hittite.com microwave corporation f ebruary 2000 y2k new! m odulators 5 smt excellent amplitude and phase balance direct modulation in the 2.4 ghz ism band 30 db carrier suppression use as a modulator or demodulator features general description the HMC236QS16G qpsk modulator is de- signed to phase-modulate an rf signal into quadrature phase states. device input is at the rf port and output is at the lo port. the polarity of the bias current at the control ports (i and q) defines the four phase states. excellent ampli- tude and phase balance is provided by closely matched monolithic balun and diode circuits delivering 30 db of carrier suppression in a 16- lead qsop package. the device also functions as an i/q demodulator with data emerging from the i and q ports when a qpsk modulated signal at the rf port is compared to a reference signal at the lo port. except for carrier suppression, the data pre- sented here was measured under static condi- tions in which a dc bias current (nominally 5 ma) is applied to the control ports. the HMC236QS16G replaces the hmc196c12. guaranteed performance, for 5ma bias current, 50 ohm system, -40 to +85 deg c parameter min. typ. max. units frequency band 2.3 - 2.5 ghz inserti on loss 11 13 db input return loss (in port) 8 12 db output return loss (out port) 12 15 db amplitude balance 0.5 1.5 db phase balance 1.5 4.0 deg carrier suppression (when driven with a 1 mhz square wave, 1.4 vp-p) 25 33 dbc input power for 1 db compression 3 6 dbm i &q bias current (bi as current forwa rd b iases interna l schottky di odes providing approximately 0.6 v at the control port s i & q). 3510ma i & q maximum data rate (50 ohm source impedance) 250 275 mhz gaas mmic smt qpsk modulator 2.4 ghz HMC236QS16G v 01.0300
5 - 15 12 elizabeth drive, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 web site: www.hittite.com microwave corporation f ebruary 2000 y2k new! 5 m odulators smt -20 -15 -10 -5 0 2.2 2.3 2.4 2.5 2.6 insertion loss (db) frequency (ghz) -90 ref +180 +90 -5 -4 -3 -2 -1 0 1 2 3 4 5 2.2 2.3 2.4 2.5 2.6 phase balance (deg.) frequency (ghz) -90 +180 +90 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.2 2.3 2.4 2.5 2.6 amplitude balance (db) frequency (ghz) -90 +180 +90 insertion loss phase balance amplitude balance HMC236QS16G smt qpsk modulator 2.4 ghz -25 -20 -15 -10 -5 0 2.2 2.3 2.4 2.5 2.6 input return loss (db) frequency (ghz) -90 +180 +90 ref input return loss -25 -20 -15 -10 -5 0 2.2 2.3 2.4 2.5 2.6 output return loss (db) frequency (ghz) -90 +180 +90 ref output return loss HMC236QS16G v 01.0300
5 - 16 12 elizabeth drive, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 web site: www.hittite.com microwave corporation f ebruary 2000 y2k new! m odulators 5 smt in (pin 13) 0 o 90 o i (pins 2 or 10) q (pins 7 or 15) out (pin 4) schematic outline drawing HMC236QS16G smt qpsk modulator 2.4 ghz rf input (in) +20 dbm i & q 16 ma storage temperature -65 o c to 150 o c operating temperature -40 o c to +85 o c absolute maximum ratings note the redundant i (pins 2 or 10) and q (pins 7 or 15) ports 1. material: a) package body - low stress injection-molded plastic. b) leadframe and slug material: copper alloy 2 . plating : lead - tin solder plate (lead and slug) 3. dimensions are in inches (millimeters). unless otherwise specified all tol. are 0.005(0.13). 4. dimension does not include moldflash of 0.15 mm per side 5. dimension does not include moldflash of 0.25 mm per side HMC236QS16G v 01.0300
5 - 17 12 elizabeth drive, chelmsford, ma 01824 phone: 978-250-3343 fax: 978-250-3373 web site: www.hittite.com microwave corporation f ebruary 2000 y2k new! 5 m odulators smt HMC236QS16G smt qpsk modulator 2.4 ghz suggested ttl driver for a qpsk modulator notes 1) v a alternates between 2.4 v dc i a = 2.4 - 0.6 = 5 ma 360 ? 2) hct04 and hc04 are qmos hex inverters. *r 1 = 300 to 620 2% select r 1 to supply 3 to 6 ma to the if port 3) note that a separate driver circuit is required for the i and q ports. 4) note the redundant i/q ports. 2.2k ttl vcc gnd gnd vcc hct04 hc04 .01 uf .01 uf -2.5 vdc +2.5 vdc +5 vdc *r 1 modulator i, q ports hittite modulator v a i a v z = 2v 0.6v HMC236QS16G v 01.0300
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