Constant-phase, gain-controlled amplification circuit

Details Constant-phase, gain-controlled amplification circuit Constant-phase, gain-controlled amplification circuit

2006-08-01

2006-08-01

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Receivers

Automatic gain control

C375S316000, C330S254000, C330S278000

Reexamination Certificate

active

07085333

ABSTRACT:
An amplification circuit (10) is used in a radio receiver (12) to achieve both constant phase shift over the gain range and low intermodulation. A gain-controlled amplifier (16) is desirably optimized for good fidelity, even if at the expense of poor phase linearity. A phase shift compensator (48) compensates for phase non-linearity by imposing a delay of variable duration downstream of the gain-controlled amplifier (16). The delay duration is determined in response to a gain-control signal (20) generated by an AGC circuit (42). The gain-control signal (20) is translated through a look-up table (62) into delay values which control a programmable delay element (64). The programmable delay element (64) generates an adjusted clock signal (54) that drives a digitizer (36). The digitizer (36) both digitizes and delays an amplified signal (32) produced by gain-controlled amplifier (16).

REFERENCES:
patent: 2839750 (1958-06-01), Kaltenbacher
patent: 4677648 (1987-06-01), Zurfluh
patent: 5293545 (1994-03-01), Huber
patent: 5678198 (1997-10-01), Lemson
patent: 6510191 (2003-01-01), Bockelman
patent: 6686969 (2004-02-01), Hara et al.
patent: 6721370 (2004-04-01), Kurihara
patent: 6816684 (2004-11-01), Grandpierre et al.
patent: 2001/0015845 (2001-08-01), Ito et al.
patent: 2002/0017135 (2002-02-01), Mori et al.

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