Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1979-03-15
1980-05-20
Smith, Alfred E.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
334 15, 455340, H04B 118
Patent
active
042041660
ABSTRACT:
A very high frequency tuner for selection of a broadcasting signal through variation of a capacitance value formed across a voltage controlled variable capacitance diode responsive to a tuning control voltage comprises an improved interstage tuned coupling circuit between a high frequency amplifier and a frequency converter of the very high frequency tuner for transmission of the output signal. The interstage tuned coupling circuit comprises a first inductance coil coupled in series between the output of the high frequency amplifier and the input of the frequency converter, a voltage controlled variable capacitance diode coupled to the input of the first inductance coil in shunt fashion so as to be responsive to a tuning control voltage, whereby a capacitance value formed thereacross is variable as a function of the tuning control voltage, a second inductance coil having a large inductance value and coupled to the output of the first inductance coil in a shunt fashion, a second capacitor coupled to the output of the first inductance coil in a shunt fashion, a switching means responsive to a band switching control signal for achieving a parallel tuning circuit including the voltage controlled variable capacitance diode and the first and second inductance coils in the low frequency band mode and for achieving a .pi.-type tuning circuit including the voltage controlled variable capacitance diode, the first inductance coil and the second capacitor in the high frequency band mode, and a coupling means for coupling the output of the tuning circuit to the frequency converter.
REFERENCES:
patent: 3579113 (1971-05-01), Jabbar
patent: 3582791 (1971-06-01), Slavin
patent: 3587017 (1971-06-01), Kurusu
patent: 3613008 (1971-10-01), Jabbar
patent: 3940714 (1976-02-01), Sato
patent: 4023106 (1977-05-01), Utsunomiya
Sanyo Electric Co,. Ltd.
Smith Alfred E.
Wise Robert E.
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