ELECTRONIC TUNING TYPE RECEIVER

PURPOSE:To achieve optimum tuning control, by providing a circuit which supplies a tuning voltage for an antenna tuning circuit and alocal oscillating circuit individually. CONSTITUTION:When a reception frequency is set to a reception frequency set circuit 16 at a channel selection switch 17, contro...

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Bibliographische Detailangaben
Hauptverfasser:	FUKUI KIYOTAKE, NINOMIYA SHIYUUICHI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY SELECTING RESONANT CIRCUITS TRANSMISSION TUNING RESONANT CIRCUITS
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Beschreibung
Zusammenfassung:	PURPOSE:To achieve optimum tuning control, by providing a circuit which supplies a tuning voltage for an antenna tuning circuit and alocal oscillating circuit individually. CONSTITUTION:When a reception frequency is set to a reception frequency set circuit 16 at a channel selection switch 17, control codes for a local oscillating circuit and an antenna tuning circuit is operated at operation circuits 14, 15. According to the result of operations, PWM waves are produced at digital signal generating circuits 12, 13. The PWM waves are converted into DC component at LPFs10, 11 and they are applied to a local oscillation varactor diode 5 and an antenna tuning varactor diode 1. Thus, even if the intermediate frequency is higher than the input signal frequency, optimum tuning control can be made.