Patent ID: 8077803
Filing Date: 2011-12-13
Classification: H03C,H04L

Abstract:
1. A transmitter circuit configured to perform IQ modulation by interleaving in-phase and quadrature signals, comprising: a baseband stage for generating in-phase and quadrature analog input signals; a local oscillator pulse generator for generating, comprising: a frequency dividing quadrature generator circuit that is coupled to receive first and second reference VCO signals and to generate therefrom in-phase and quadrature clocking signals separated in phase from each other by substantially ninety degrees; and a plurality of transmission gates configured in a matched switching topology so as to selectively pass pulses from the first and second reference VCO signals under control of the in-phase and quadrature clocking signals, thereby generating matched differential interleaved local oscillator signals; and a switching mixer comprising a plurality of switches for simultaneously receiving the matched differential interleaved local oscillator signals and producing a differential signal by interleaving the in-phase and quadrature analog input signals over a plurality of phases of a carrier period under control of the matched differential interleaved local oscillator signals.