Patent ID: 9614623
Date: 2017-04-04
CPC Classifications: H03F,H04B,H04J

Claim:
1. A method for current replication, the method comprising: receiving, at a photodetector, an optical signal having a plurality of wavelengths and an optical power; responsive to the optical signal received, generating a photodetector current when the photodetector is reverse biased with a bias voltage, wherein the photodetector current is enabled to flow between a cathode of the photodetector and a negative terminal of a transimpedance amplifier (TIA) having a first feedback resistor; based on the photodetector current, generating a TIA output voltage that is linear with the optical power; and converting the TIA output voltage to a second current that flows to a current input of a logarithmic amplifier to generate a second output voltage that is linear with the optical power in decibels (dB).