Patent ID: 7711327
Filing Date: 2010-05-04
Classification: H03B,H03G,H03L

Abstract:
1. A differential radio frequency (RF) receiver, comprising: a fully differential direct conversion receive chain; a subharmonic mixer in the receive chain, the subharmonic mixer configured to receive a differential radio frequency (RF) input signal and a local oscillator (LO) signal that is phase-shifted by a nominal 45 degrees; a synthesizer having a voltage controlled oscillator and having at least one frequency divider to generate desired receive LO signals; fully differential low noise amplifiers in the receive chain, the fully differential low noise amplifiers configured to provide no voltage gain to the received RF signal; and direct current (DC) blocking capacitors between the low noise amplifiers and the subharmonic mixer, the DC blocking capacitors configured to provide a low impedance to the subharmonic mixer and to fold radio frequency (RF) current to the subharmonic mixer.