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AssigneeQUALCOMM Incorporated
InventorsVinay Murthy, Linbo Li, Raghuraman Krishnamoorthi
Estimating the term…
A control of an amplifier in an automatic gain control (AGC) loop, e.g. in the RF front end circuitry of an OFDM receiver, provides phase adjustment control data to an associated automatic frequency control (AFC), to compensate for a phase jump that would otherwise be caused by switching of the AGC gain between discrete gain states. In the disclosed example, for each gain state, comparators detect a signal energy estimate crossing either a high threshold or a low threshold. Upon threshold crossing, multiplexers select compensation data corresponding to the necessary transition from the prior state to the new state determined by the comparators, based on identification of the prior state and on the particular threshold that has been crossed (high or low). The phase compensation data supplied to the AFC, for one interval corresponding to the timing of the gain switching, adjusts phase rotation implemented in the AFC.
A method of automatic gain control comprising steps of:
A signal processing circuit, comprising:
A radio-frequency (RF) signal processing circuit, comprising:
Computer readable storage media containing a set of instructions for a processor in a signal processing circuit that includes an amplifier having a controlled gain, for amplifying a received signal, and an automatic frequency control (AFC), for frequency control processing of samples related to an amplified signal from the amplifier, the set of instructions, comprising:
A signal processing circuit, comprising:
Dependencies are inferred from the claim text.