| 摘要 |
This application describes apparatus and method for DC offset compensation. An amplifier (102) receives an input signal (AIN) and provides an amplified output signal (SOUT) and a feedback path provides DC offset compensation. The feedback path comprises at least one voltage controlled oscillator (VCO) (108) and a counter (109). The VCO provides, over time, a first VCO output signal based on said amplified output signal and a second VCO output signal based on a reference signal (VREF). The counter generates first pulse counts based upon the first VCO output signal and second pulse counts based upon the second VCO output signal and provides a compensation signal based on a comparison of the first and second pulse counts. One voltage controlled oscillator (108) may sequentially receive a signal based on said amplifier output signal and the reference signal from a multiplexer (110) so as to sequentially produce the first and second VCO output signals. |
