Patent ID: 7269395
Filing Date: 2007-09-11
Classification: G06K

Abstract:
1. An envelope detection circuit, comprising: a signal rectifier having an input port configured to receive an amplitude modulated input signal, and an output port; a first capacitor having a first port coupled to the output port of the signal rectifier and a second port for coupling to a signal ground; a first transistor having a first port coupled to the output port of the signal rectifier, a second port for coupling to a signal ground, and a control port; a second transistor having a first port for coupling to a power supply, a second port, and a control port coupled to the output of the signal rectifier; a third transistor having a first port coupled to the second port of the second transistor, a second port for coupling to a signal ground, and a control port; and a second capacitor having a first port coupled to first port of the third transistor, and a second port for coupling to a signal ground.