Patent ID: 7868294
Filing Date: 2011-01-11
Classification: H04B

Abstract:
1. An infrared receiver circuit configured to generate an ambient light output signal at an output pin, the receiver circuit including: an ambient correction current transistor having a first current terminal coupled to a first power supply rail, a second current terminal for coupling to a receive photodiode, and a control terminal; an ambient correction amplifier having an output coupled to the control terminal of the ambient correction current transistor, a first input, and a second input coupled to a reference voltage source; a capacitor coupled between the output of the ambient correction amplifier and the first power supply rail; a transimpedance amplifier having an output coupled to the first input of the ambient correction amplifier through a first resistor, a first input coupled to the second current terminal of the ambient correction current transistor and coupled to the output of the transimpedance amplifier through a second resistor, and a second input coupled to the reference voltage source; and an output transistor having a first current terminal coupled to the first power supply rail, a second current terminal coupled to the output pin, and a control terminal coupled to the control terminal of the ambient correction current transistor.