Analog to digital convertor and a method of calibrating same

摘要

An analog to digital convertor (ADC) comprises an integrator having an input selectively connected to an intermediate frequency (IF) signal input and an output connected to a summer. The summer has an output connected to an input of a quantizer, the quantizer output being operatively connected to a signal strength indicator. The integrator includes a programmable gain feedback component. The summer has a synthesized calibration signal input, the value of the programmable gain feedback component being configured to vary when a synthesized calibration signal at the intermediate frequency is applied to the summer. The signal strength indicator is configured to detect a value of the programmable gain feedback component when the signal strength is minimized and to calibrate the ADC accordingly.

主权项

1. An analog to digital convertor (ADC) comprising an integrator a summer, and a quantizer, the integrator having an input selectively connected to an intermediate frequency (IF) signal input and an output connected to the summer, the summer having an output connected to an input of the quantizer, the quantizer output being operatively connected to a signal strength indicator, said integrator including a programmable gain feedback component, said summer having a synthesized calibration signal input, a value of the programmable gain feedback component being configured to vary when a synthesized calibration signal at said intermediate frequency is applied to said summer, said signal strength indicator being configured to detect the value of said programmable gain feedback component when a signal strength is minimized and to calibrate said ADC accordingly.