Automatic gain control circuit and method for direct...

Details Automatic gain control circuit and method for direct... Automatic gain control circuit and method for direct...

2006-01-10

2006-01-10

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S260000, C327S164000

Reexamination Certificate

active

06985514

ABSTRACT:
An automatic gain control circuit (3) for a direct sequence spread spectrum receiver. A discrimination unit (10) generates a discrimination signal error from received in-phase and quadrature base band signals, whilst multiplication unit (16) multiplies the discrimination signal error by a first loop gain constant during signal acquisition and a second different loop gain constant during signal tracking. A recursive integrator (22) then acquires an integrated AGC value from the multiplied discrimination signal error.By using two different values of loop gain, the circuit is able to alternate between a “fast mode” during signal acquisition, and a “slow track” mode during signal tracking.

REFERENCES:
patent: 4633485 (1986-12-01), Betts et al.
patent: 5635864 (1997-06-01), Jones
patent: 5764689 (1998-06-01), Walley
patent: 6477196 (2002-11-01), Swanke et al.
patent: WO 00/31867 (2000-06-01), None

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