Frequency conversion circuit with UHF/VHF common PLL buffer

Details Frequency conversion circuit with UHF/VHF common PLL buffer Frequency conversion circuit with UHF/VHF common PLL buffer

1993-12-20

1996-06-11

Pascal, Robert

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331 46, 331117R, 331108C, 4551901, 4551802, 4551911, 348725, 348731, H03B 512, H04B 126, H04N 550

Patent

active

055259375

ABSTRACT:
An integrated oscillation circuit used for frequency conversion circuit in which UHF frequency conversion and VHF frequency conversion are selectively energized to use a common IF amplifier. The integrated oscillation circuit is used for a local oscillation circuit. The integrated oscillation circuit including a connection terminal connected to an external resonance circuit and an input line of a mode switching signal which is set at a different level in response to an operation mode, an oscillation element, a bias terminal of which is connected to the connection terminal, a detection circuit detecting the level of the mode switching signal applied to the bias terminal of the oscillation element, and a switching circuit turning on and off a power source for driving the oscillation element in response to the level detected at the detection circuit.

REFERENCES:
patent: 4322856 (1982-03-01), Ohta et al.
patent: 4621241 (1986-11-01), Kiser
patent: 4723110 (1988-02-01), Voorman
patent: 4731592 (1988-03-01), Sato et al.
patent: 4912520 (1990-03-01), Yamamoto et al.
patent: 5115317 (1992-05-01), Igarashi et al.
WAM 2.4: A 470MHz 5V CATV Turner, Chikara Yamada, Yoshio Ueki, Mitsuru Itoh, Akira Satoh, Kohichi Ohya; Sony Corp.; Kanagawa, Japan; Session II: Consumer ICs; ISSCC 85/ Wednesday, Feb. 13, 1985/West Ballroom.

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