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A Reflected Light-receiver With 2nA Sensitivity Using CDS And A Separate Lowpass-filtering Of The Input Signal At Each Clock-phase

The design of an integrated receiver for reflected light using correlated double sampling (CDS) is presented. Correlated double sampling has the disadvantage that input signals of high frequencies are folded back to the base band caused by sampling the continuous input signal [1]. However, the circuit presented here uses a new method to limit the bandwidth of the CDS input signal. Two filter-capacitors, one for each clock phase, are periodically connected to the input of the CDS circuit. As the input signal is lowpass filtered by the ohmic output resistance of the optical sensor in conjuction with the filter-capacitors, allasing can be avoided.