A Broad-band Quadrature Detector for A Digital Satellite TV Broadcasting Receiver

Abstract

A broad-band quadrature detector which is included a broad band 90 degrees phase shifter and multiplexers, has been developed for digital satellite TV broadcasting receiver. The quadrature detector can split a broad band IF input signal at 400〜500MHz into I and Q quadrature base band signals for a digital QPSK demodulation.