Patent ID: 7369827
Filing Date: 2008-05-06
Classification: H04N

Abstract:
1. A tuner for a cable modem, comprising: a front end decoupler stage having an input and an output; a single conversion tuner having an input coupled to said output of said front end decoupler stage and an output; said front end decoupler stage receiving a plurality of RF signals at said input thereof and passing each one of said plurality of received RF signals to said input of said single conversion tuner; said single conversion tuner receiving said plurality of RF signals, selecting one of said plurality of RF signals for conversion into an IF signal and transmission from said output and rejecting the remainder of said plurality of RF signals; said front end decoupler stage being comprised of uni-directional circuitry which isolates said single conversion tuner from said input of said front end decoupler stage by passing each one of said plurality of received RF signals while preventing said rejected ones of said plurality of RF signals and return signals generated by said single conversion tuner during conversion of said selected one of said plurality of RF signals into said IF signal from passing back through said front end decoupler stage; and a memory for holding therein calibration data pertaining uniquely to said tuner.