Patent ID: 9020456
Filing Date: 2015-04-28
Classification: H03K,H04B,H04W,Y02D

Abstract:
1. An improved rectifier for use in a low power radio, comprising: an active circuit including a first active field effect transistor, the active circuit configured to receive an RF signal and operates, in presence of an RF signal, to decrease voltage at a drain terminal of the first active field effect transistor; a replica bias circuit, including a first bias field effect transistor, that operates to output a constant voltage at a drain terminal of the first bias field effect transistor; and an active feedback circuit having an input connected to a drain terminal of the first bias field effect transistor and an output connected to a gate terminal of both the first active field effect transistor and the first bias field effect transistor, wherein the active feedback circuit biases the first active field effect transistor to operate in a subthreshold region and biases the first bias field effect transistor to operate in a subthreshold region.