Patent ID: 6192225
Filing Date: 2001-02-20
Classification: H03D,H04B

Abstract:
An apparatus for receiving a radio frequency (RF) signal, comprising:an RF input for receiving a modulated RF signal;a mixer having first and second inputs and an output, the first input of said mixer electrically coupled to said RF input;a local oscillator for generating a reference signal;a switching oscillator for generating a switching signal having a first state and a second state;a switchable phase change element having a signal input, a control input and an output, wherein said signal input is electrically coupled with said local oscillator, said control input is electrically coupled to said switching oscillator, the output of said phase change element is electrically coupled to the second input of said mixer;a switchable inverter having a signal input, a control input and an output, the output of said mixer is electrically coupled to the signal input of said inverter and the output of said switching oscillator is coupled to the control input of said inverter; anda first low pass filter electrically coupled to the output of said first switchable inverter, the first low pass filter having a bandwidth less than a switching frequency of the switchable inverter.