Reverse electronic tuning circuit for FM radio...

Details Reverse electronic tuning circuit for FM radio... Reverse electronic tuning circuit for FM radio...

2007-01-23

2007-01-23

Urban, Edward F. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S164200, C455S169100

Reexamination Certificate

active

10857778

ABSTRACT:
An electronic circuit having reverse scan tuning comprises an IC radio having the forward scan function, in which a VCO capacitor is connected in parallel to a series connected resistor and switch, and a second switch is connects an input to an IF limiter amplifier to either circuit ground or a voltage supply. The invention makes it convenient for a user to search for a radio station by not having to start a search for a lower band station at the lowest end of the frequency band. The user does not need to push reset button to return to the lowest frequency when the user wants to receive a station whose frequency is lower than the current station.

REFERENCES:
patent: 3384826 (1968-05-01), Schurig
patent: 3840820 (1974-10-01), Kawada
patent: 3986154 (1976-10-01), Yamada et al.
patent: 2003/0013424 (2003-01-01), Adrain
Product Description, TDA7088T, FM receiver circuit for battery supply, Konninklijke Phillips Electronics N.V.
Integrated Circuits, Data Sheet TDA7088T FM Receiver Circuit for Battery Supply; Philips Semiconductors, May 1996; pp. 1-15.
SC1088, FM Receiver Circuit for Battery Supply; HangZhou Silan Microelectronics Joint-Stock Co., Ltd.; Silan Semiconductors, pp. 1-7.
Philips Semiconductor: “TDA7088T FM Reciever Circuit for Battery Supply”, http://www.semiconductors.philips.com/acrobat—download/datasheets/TDA7088T—2.pdf, May 14, 1996.

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