Patent ID: 8730075

Claim:
An apparatus, comprising: a charge-pump; a sampler that samples an optical signal, including: a black sampler that samples ambient noise when a video signal is not being applied; a video sampler; and an analog to digital converter (“ADC”); and a single clock that is coupled to and provides clocking signals to: a) a charge-pump logic that is coupled to said charge-pump; and b) a sampler logic that is coupled to said sampler that samples said optical signal, wherein i) said first clock signal rises three clock cycles before said second clock signal rises; ii) said second clock signal is high for seventeen clock cycles; iii) said second clock signal falls five clock cycles before said first clock train signal falls; and iv) said first clock signal is low for seventeen clock cycles, then rises, wherein if the clock for the charge pump is running faster than an analog front end (“AFE”) video sampling clock, a state-machine control is configured to: skip the charge pump clock period right before a video sample signal falling edge, thereby recovering to a normal operation the next charge-pump clock period, wherein this duty cycle modulation of charge pump clock will not substantially impact charge pump output.