Telecommunications – Receiver or analog modulated signal frequency converter – Convertible to different type
Patent
1979-07-13
1983-04-19
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Convertible to different type
455188, 455343, H04B 116
Patent
active
043808239
ABSTRACT:
A semiconductor chip contains a multi-channel signal-processing circuit for processing signals in different frequency bands (e.g., an AM and an FM receiver). An inductor is coupled via an external terminal on a package for the semiconductor chip to a first signal-processing circuit. A circuit detects when a connection is made between the inductor and a power supply terminal contained in the semiconductor chip. When the inductor is connected to the power supply terminals, the first signal-processing circuit is activated, while the second signal-processing circuit is deactivated. When the inductor is disconnected from the power supply terminal, the second signal-processing circuit is activated, while the first signal-processing circuit is deactivated. The circuit for detecting a connection between the inductor and the power supply terminal is either a circuit for detecting a potential change or a circuit for detecting an oscillating signal. The inductor may be either an oscillator coil or an IF transformer winding.
REFERENCES:
patent: 3614468 (1971-10-01), Ehlbeck et al.
patent: 4050022 (1977-09-01), McFadyen et al.
An AM/FM Radio Subsystem I.C.-Blaser et al, Fairchild Camera & Instruments Corp., Mountain View Calif., May 1977, pp. 129-135, IEEE Trans. on Consumer Electronics.
Doi Kazuyuki
Higashiyama Naotoshi
Bookbinder Marc E.
Nippon Electric Co. Ltd.
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