Patent ID: 9494462
Filing Date: 2016-11-15
CPC Classification: G01J

Claim Text:
1. A circuit comprising: a first photo detector to receive a first light input signal and to generate a first current output signal in response to the first light input signal; a second photo detector to receive a second light input signal to generate a second current output signal in response to the second light input signal; a current multiplier stage that receives the second current output signal from the second photo detector to generate a multiplied current output signal that is greater than the magnitude of the second current output signal; and a differential multiplier having a first current path that receives a portion of the multiplied current output signal and a second current path that receives another portion of the multiplied current output signal, wherein the first current path is in series with the first current output signal to facilitate balancing of currents between the first current output signal of the first photo detector and the second current output signal of the second photo detector.