Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1986-07-16
1989-07-18
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455239, 455241, 455253, 455311, H04B 126
Patent
active
048500380
ABSTRACT:
A frequency converter suitable for a multi-channel broadcast signals receiver is provided. The frequency converter includes a pre-amplifier with an AGC control terminal, first and second local oscillators, a first mixer for converting a first-RF frequency of the broadcast signal to a second-RF frequency using a first oscillation signal output from the first local oscillator, a second-RF signal amplifier with an AGC control terminal for amplifying the second-RF signal, a second mixer for converting the second-RF frequency of the second-RF signal output from the second-RF signal amplifier to a third-RF frequency using a second local oscillation signal output from the second local oscillator, and an AGC circuit for feeding back to the pre-amplifier and the second-RF signal amplifier the AGC signal which is obtained from the third-RF frequency signal as a conversion output from the second mixer for simultaneously controlling the gains of both the preamplifier and the second-RF signal amplifier.
REFERENCES:
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patent: 4222118 (1980-09-01), Dickinson et al.
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patent: 4509207 (1985-04-01), Tong et al.
patent: 4545072 (1985-10-01), Skutta et al.
patent: 4590613 (1986-05-01), Tannery, IV
patent: 4704738 (1987-11-01), Graziadei et al.
Matsutake Masayuki
Shibata Fumiaki
Griffin Robert L.
Kabushiki Kaisha Toshiba
Kuntz Curtis
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