Manoj Gupta

US Patent:

20050090213, Apr 28, 2005

Filed:

Apr 30, 2004

Appl. No.:

10/836545

Inventors:

Chun Heng - La Jolla CA, US
Manoj Gupta - La Jolla CA, US
Sanghoon Lee - Chuncheon-si, KR
David Kang - Fullerton CA, US

International Classification:

H04B001/18

US Classification:

455154100, 455150100

Abstract:

A tuner and demodulator performing image rejection in an analog cable television system. Various embodiments disclose a tuner including an analog RF section to generate a complex intermediate frequency digital signal, an image rejection module configured to perform image rejection on the complex intermediate frequency digital signal to generate an enhanced image rejection signal, a signal channel select filter configured to perform digital on-chip filtering on the enhanced image rejection signal to generate a filtered signal, and a demodulator configured to demodulate the filtered signal to generate digital output signals. In some embodiments, the tuner is substantially or fully monolithic. In some embodiments, the tuner performs image rejection by applying an algorithm to estimate a signal correlation between the signal band and the image band of the complex intermediate frequency digital signal, and providing adaptive filtering to reduce signal leakage and image leakage.