Fully integrated terrestrial TV tuner architecture

Details Fully integrated terrestrial TV tuner architecture Fully integrated terrestrial TV tuner architecture

2003-04-28

2009-02-03

Yenke, Brian P (Department: 2622)

Television

Receiver circuitry

Tuning

C348S725000, C348S733000, C455S189100, C455S296000, C455S334000, C455S339000, C327S557000, C327S564000

Reexamination Certificate

active

07486338

ABSTRACT:
A TV tuner consisting of a least one low-noise amplifier, one mixer and one variable-gain amplifier plus two band-pass filters, the first of which is placed after low-noise amplifier and before the mixer, and the second of which is placed after mixer and before variable-gain amplifier. The filters are on-chip active devices equipped with on-chip frequency- and Q-tuning systems. The first band-pass filter is a real filter, such that its frequency response is symmetrical for positive and negative frequencies. The second band-pass filter is a complex filter, such that its frequency response has transmission for positive frequencies, but blocks negative frequencies. The low-noise amplifier includes gain control. The mixer is a complex-mixer consisting of two identical mixers driven by two local oscillator signals in quadrature.

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