Patent ID: 7015755

Claim:
A circuit arrangement for combining a modulator and an automatic gain control (AGC) amplifier comprising: a modulator having inputs for receipt of signal inputs (IN+, IN−) and means for converting the signal inputs into modulated output current signals (OP 1 , OP 2 , R 3 , R 4 ; Q 1 , Q 2 , Q 3 , Q 4 ), based upon a local oscillator reference signal (LO+, LO−); an automatic gain control (AGC) amplifier operatively connected to the modulated output current signals of the modulator and also connected to a supply voltage (Vcc), the AGC amplifier further having means for amplifying said output current signals for delivering the output current signals to one of two balanced loads (R 1 , R 2 ; and corresponding opposite phase components); wherein the output current signals are re-used by the AGC amplifier; and a non-inverting gain stage connected to the signal inputs (IN+, IN−) and having outputs connected to the inputs of the modulator.