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US09077585B2 Fully integrated DC offset compensation servo feedback loop 有权
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Fully integrated DC offset compensation servo feedback loop
Abstract:
The fully integrated DC offset compensation servo feedback loop is an integrator that measures the output signal DC component, and then feeds back and subtracts the measured DC component from the input signal. A larger integrator time constant lowers the high pass corner frequency, which must be very small in order to minimize the loss of the low frequency component of the desired signals. The large time constant is achieved on an integrated circuit by the use of a class-AB fully differential opamp in conjunction with an R-2R ladder as a circuit element to accomplish an integrated large time constant integrator. The R-2R ladder is configured as a digitally programmable resistor.
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