Patent ID: 8055231
Filing Date: 2011-11-08
Classification: H03M,H04B

Abstract:
1. A RF feedback engine formed on an integrated circuit comprising: A. a first digital to analog converter having a DATAI+ input, a DATAI− input, and an output; B. a first load/filter having one lead connected to the output of the first digital to analog converter and another lead connected to circuit ground; C. a first mixer having a first input connected to the output of the first analog to digital converter, a second input connected to a first clock signal, and an output; D. a first load having an input coupled to the output of the first mixer and an output; E. a second digital to analog converter having a DATAQ+ input, a DATAQ− input, and an output; F. a second load/filter having one lead connected to the output of the second digital to analog converter and another lead connected to circuit ground; G. a second mixer having a first input connected to the output of the second analog to digital converter, a second input connected to a second clock signal, and an output; H. a second load having an input coupled to the output of the second mixer and an output; I. an attenuator having an input connected to the outputs of the first and second loads and an output; and J. a low noise amplifier having an I input and a Q input from an antenna, a feedback input coupled to the output of the attenuator, an I output coupled to the DATAI and DATAI+ inputs of the first digital to analog converter and a Q output coupled to the DATAQ and DATAQ+ inputs of the second digital to analog converter.