Pulse or digital communications – Receivers – Automatic gain control
Reexamination Certificate
2007-06-05
2007-06-05
Ha, Dac V. (Department: 2611)
Pulse or digital communications
Receivers
Automatic gain control
C375S324000, C455S232100, C455S245100
Reexamination Certificate
active
10649427
ABSTRACT:
An automatic gain control (AGC) method and circuit (10) within a receiver uses a digital state machine (26) to implement the AGC function. independent from interaction with a host processor (36) and for multiple modulation protocols without duplicating circuitry. Modulation protocol and parameters for any of various gain responses are stored in a register (29). Multiple states, each corresponding to a predetermined range of RF input signal strength, are stored in the register. Each state contains parameters that determine a gain control signal for controlling a variable gain amplifier (16). The states are independent and may be selectively disabled to create asymmetric responses. Within any state, an adaptable number of iterations may be set to implement a different update rate or step size after a predetermined number of closed loop gain change iterations has not resulted in a transition to a state that represents a desired output gain.
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Ben-Ayun Moshe
Graham David J.
Rozental Mark
Ruelke Charles R.
Freescale Semiconductor Inc.
Ha Dac V.
King Robert L.
Noonan Michael P.
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