Switching circuit for a satellite broadcasting converter capable

Details Switching circuit for a satellite broadcasting converter capable Switching circuit for a satellite broadcasting converter capable

1995-06-05

1997-07-15

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455 32, 455131, H04B 118, H04B 344

Patent

active

056493118

ABSTRACT:
There is provided a switching circuit of a BS converter capable of assuring a high sensitivity. A BS tuner superimposes a band switching pulse signal on a power voltage when selecting a high band, and supplies the resulting signal to a BS converter. The BS converter amplifies a pulse signal selected by a filter circuit of a switching circuit by ten times in a differential amplifier, rectifies the resulting signal in a rectifying circuit, and compares the resulting signal with a reference voltage in a comparator circuit, thereby detecting the presence or absence of the band switching pulse signal. When the band switching pulse signal is detected, a high-band local oscillator is turned on by a drive circuit. When the signal is not detected, a low-band local oscillator is turned on. Thus, by amplifying by about ten times the band switching pulse signal having a voltage of about 0.6 V, a reception frequency band is switchedly selected with high accuracy.

REFERENCES:
patent: 4509198 (1985-04-01), Nagatomi
patent: 4538175 (1985-08-01), Balbes et al.
patent: 4554552 (1985-11-01), Alford et al.
patent: 4592093 (1986-05-01), Ouchi et al.
patent: 5206954 (1993-04-01), Inoue et al.
patent: 5263182 (1993-11-01), Park

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