Trap circuit for blocking spurious signals from a T.V. intermedi

Details Trap circuit for blocking spurious signals from a T.V. intermedi Trap circuit for blocking spurious signals from a T.V. intermedi

1978-07-27

1980-06-03

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

358167, 455311, H04B 110, H04B 1500, H04N 544

Patent

active

042064120

ABSTRACT:
A tuner for use with a television receiver includes a mixer receiving and mixing radio frequency and local oscillator signals and a low-pass peaking circuit for preferentially coupling the intermediate frequency from the mixer to an intermediate frequency amplifier. A capacitor in parallel with a series combination of an inductor and a capacitor in the peaking circuit forms a trap circuit for blocking spurious high-frequency signals from the intermediate frequency amplifier. An emitter follower between the mixer and the intermediate frequency amplifier may be included within the parallel connection.

REFERENCES:
patent: 2204954 (1940-06-01), Anderson et al.
patent: 3416086 (1968-12-01), Carlson

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