Patent ID: 6725463
Filing Date: 2004-04-20
Classification: H03D,H03L,H04N

Abstract:
A receiver comprising:an input for receiving an RF signal having a plurality of channels, wherein said channels are in either a first signal format or a second signal format; a conversion circuit for converting received RF signals to IF signals; a first signal filter receiving said IF signals from said conversion circuit and having a frequency response suitable for passing channels in said first signal format; a second signal filter switchably coupled to an output of said first signal filter and providing a combined frequency response suitable for passing channels in said second signal format when operating with said first signal filter; wherein said conversion circuit is a dual conversion circuit comprising: a first mixer having a first input for receiving said RF signal and a second input coupled to a first reference signal; and a second mixer having a first input coupled to said first mixer and a second input coupled to a second reference signal, wherein said second reference signal provides fine tuning by three VCOs and wide band phase lock loops providing a highly coherent reference signal suitable for down-converting said signal of said first signal format and said signal of said second signal format.