Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1993-04-05
1995-09-05
Pham, Chi H.
Telecommunications
Transmitter
With feedback of modulated output signal
455127, 329318, 330129, 330279, 330288, 330289, H04B 104, H03D 118, H03G 312, H03F 310
Patent
active
054487706
ABSTRACT:
A TC controlled RF signal detecting circuitry (211) used in the output power control circuit of a TDMA RF signal power amplifier includes positive coefficient current source (303) producing current I+ having a positive TC, negative coefficient current source (305) producing current I- having a negative TC, and current mirror (301) for summing currents I+ and I- to produce substantially identical compensated mirror currents Im1 and Im2. Anti-clamping current mirror (309) mirrors current Im2 to produce compensated currents Ia1 and Ia2, which are applied to and bias a Schottky diode coupled in series to a resistor network in each leg of diode detector (311). Each leg of diode detector (311) has a positive TC, which is substantially offset by the negative TC of compensated currents Ia1 and Ia2. Schottky diode (431) in one leg of diode detector (311) half-wave rectifies RF feedback signal (212) to produce temperature and voltage compensated power level signal (229), which has a DC level proportional to the output power level of RF output signal (214). By using TC controlled RF signal detecting circuitry (211), power level signal (229) has a DC level which is stable to within 5 mV over temperature ranging from -55.degree. C. to +125.degree. C. and over power supply voltage ranging from 2.7 V to 4.75 V.
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Hietala Alexander W.
Stockstad Troy L.
Vyne Robert L.
Motorola Inc.
Pham Chi H.
Vaas Randall S.
Wisler Mark D.
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