Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1985-06-27
1987-06-30
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455323, 455326, 455333, 455343, H04B 126
Patent
active
046776923
ABSTRACT:
A frequency conversion apparatus for converting a high frequency signal into an intermediate frequency signal includes a mixer section for mixing a high frequency signal with a local oscillator signal so as to obtain an intermediate frequency signal, and an amplifier connected to the mixer section via a high frequency stopping circuit for supplying a constant direct current to the mixer section as a constant current source. A current flowing in the mixer section when the local oscillator signal is applied is kept substantially equal to a direct current flowing in the mixer section when no local oscillator signal is applied thereto. The amplifier is used for amplifying either the high frequency signal or the intermediate frequency signal, or both signals at the same time.
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Kubo Kazuhiko
Nagai Hiroyuki
Sakashita Seiji
Sato Takeshi
Usui Akira
Matsushita Electric - Industrial Co., Ltd.
Ng Jin F.
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