Method of using control loops in a broadband cable tuner

Details Method of using control loops in a broadband cable tuner Method of using control loops in a broadband cable tuner

2007-03-27

2007-03-27

Kostak, Victor R. (Department: 2622)

Television

Receiver circuitry

Power supply

C348S731000, C455S343100, C340S007340

Reexamination Certificate

active

10349941

ABSTRACT:
Currently tuner circuits maintain normal power consumption while they are receiving RF signals and do not have provisions therein for disabling portions of their circuitry for reducing of power consumption. For example, during changing of channels, portions of the tuner are not used while the tuner is waiting for channel data. Thus, disabling portions of the circuit while the tuner is waiting for data serves to reduce power consumption of the tuner. Furthermore, tuner power consumption is reduced by determining whether a signal input to the tuner circuit requires amplification or not, or whether linearity in the amplifier can be sacrificed by a reduction in amplifier gain. Thus, a tuner circuit is provided that has control loop circuitry to execute control loops for controlling the gain and linearity of the tuner, as well as power consumption of circuitry therein.

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