Patent ID: 7982651
Filing Date: 2011-07-19
Classification: H03M

Abstract:
1. An apparatus comprising: an analog-to-digital converter (ADC) configured to convert an analog baseband signal of a radio frequency (RF) receiver from analog to digital, wherein an effective number of bits (ENOB) of the ADC is controllable; and an ENOB control circuit in communication with the ADC, wherein the ENOB control circuit is responsive to at least one control input, wherein the ENOB control circuit is configured to adaptively control the ENOB of the analog-to-digital converter (ADC) in response to the at least one control input; wherein the at least one control input comprises one or more of a level of automatic gain control of the RF receiver, a level of the output range of the ADC, or an amount of interference; wherein the ADC comprises a pipelined ADC, wherein the ENOB control circuit is further configured to adaptively control the effective number of bits of the ADC by control of a settling time of the pipelined ADC, wherein the settling time is associated with at least one switched-capacitor op-amp stage of the pipelined ADC.