Broadcast receiver adapted for analog and digital signals

Abstract

Abstract Background: Digital satellite TV broadcasting systems use an analog IF input followed by an analog QPSK-demodulator and analog lowpass filters prior to A/D conversion. Normally, two A/D converters would be required for digital demodulation of the in phase and of the quadrature component. Gist of the Invention A first IF frequency of about 2 GHZ and a second IF of about 140 MHz allows to demodulate FM signals of 27 MHz bandwidth. A subsequent local 70 MHz local oscillator is followed by a lowered resolution A/D converter operating at about 100 MHz sampling frequency in a subsampling mode. A single A/D converter (7) is required only and allows high quality FM demodulation. Advantages Allows multi-standard front-end architecture, architecture is suited for digital and analogue input signals, the possible net data rate around 40MBit/s is even higher than required for DirecTV.

Inventors

• 👤 Werner Boie

Bibliographic Details