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US 2014/0112500 A1Published application
Dc offset compensation
AssigneeWolfson Microelectronics plc
InventorJohn Paul Lesso
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AssigneeWolfson Microelectronics plc
InventorJohn Paul Lesso
Estimating the term…
An apparatus and method for DC offset compensation. An amplifier 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) and a counter. 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 may sequentially receive a signal based on said amplifier output signal and the reference signal from a multiplexer so as to sequentially produce the first and second VCO output signals.
DC offset compensation circuitry for compensating for DC offset in a signal path wherein said compensation circuitry is multiplexed between a first feedback loop for compensating for offset in a first part of the signal path and a second feedback loop for compensating for offset in a second part of the signal path.
A method of compensating for DC offset in a signal path comprising multiplexing compensation circuitry between a first feedback loop for compensating for offset in a first part of the signal path and a second feedback loop for compensating for offset in a second part of the signal path.
A signal processing circuit having a signal path and comprising DC offset compensation circuitry;
DC offset compensation circuitry for compensating for DC offset in a signal path wherein said compensation circuitry is multiplexed between:
Dependencies are inferred from the claim text.