Patent ID: 9044149
Filing Date: 2015-06-02
Classification: A61B,H04L,H04W

Abstract:
1. A circuit comprising: a light detector for receiving light and for generating a first electrical signal based on the received light; a controller for generating one or more first control signals and one or more second control signals; a first switching circuit having at least a first configuration and a second configuration, the first switching circuit for: a first sampling circuit for sampling a value of the first voltage signal when the first switching circuit is in the first configuration; a second sampling circuit for sampling a value of the first voltage signal when the first switching circuit is in the second configuration; and an ambient light cancellation circuit for generating a first current signal to at least partially counter a first component of the first electrical signal when the first switching circuit is in the first configuration, the first current signal being based on the one or more second control signals and the value of the first voltage signal sampled by the second sampling circuit.