Digital broadcasting receiver tuner

Details Digital broadcasting receiver tuner Digital broadcasting receiver tuner

1997-08-04

1999-12-07

Chin, Stephen

Pulse or digital communications

Receivers

455327, H03K 900, H04L 2706

Patent

active

059995726

ABSTRACT:
A digital broadcasting receiver tuner that demodulates excellently a digital signal by substantially reducing a second local oscillation signal that strays from a second frequency conversion stage to a first frequency conversion stage. The digital broadcasting receiver tuner comprises the first frequency conversion stage for frequency converting a received signal into a first intermediate frequency signal higher than the upper frequency limit the received signal, a first intermediate frequency filter for extracting the first intermediate frequency signal, the second frequency conversion stage for frequency converting the extracted first intermediate frequency signal into a second intermediate frequency signal having a predetermined band included in a frequency range extending from 0 to 30 MHz, a second intermediate frequency filter for extracting the second intermediate frequency signal, and a demodulation stage for demodulating the extracted second intermediate frequency signal, wherein the second frequency conversion stage comprises a frequency mixer of high isolation characteristics.

REFERENCES:
patent: 4520507 (1985-05-01), Moon
patent: 4534062 (1985-08-01), Levinson
patent: 4580290 (1986-04-01), Ushida
patent: 4713808 (1987-12-01), Gaskill et al.
patent: 5060299 (1991-10-01), Enderson
patent: 5212835 (1993-05-01), Suzuki
patent: 5760632 (1998-06-01), Kawakami et al.

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