Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1997-11-21
2000-02-01
Bost, Dwayne D.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551933, 455313, H03B 508
Patent
active
060213221
ABSTRACT:
In an AM radio receiver, a radio-frequency tuning circuit comprises a tuning coil, and variable capacitance diode elements connected to the tuning coil; a local oscillator circuit comprises an oscillator coil, a variable capacitance diode element connected in parallel with the oscillator coil, and a capacitance element connected in series with the oscillator coil; and tuning voltage is applied from a variable voltage source to the variable capacitance diode elements of the high-frequency tuning circuit, and to the variable capacitance diode element of the local oscillator circuit through a voltage adjustment circuit connected to the variable voltage source and a reference voltage source.
REFERENCES:
patent: 3714584 (1973-01-01), Allner
patent: 3755763 (1973-08-01), Hoshi
patent: 4030035 (1977-06-01), Ienaka et al.
patent: 4370629 (1983-01-01), Martin
patent: 4628540 (1986-12-01), Hendriks
patent: 4837852 (1989-06-01), Takada et al.
patent: 4847572 (1989-07-01), Yokoyama
patent: 5481227 (1996-01-01), Komori et al.
Ford Radio Service Manual, EPC-49, (1992) Ford Motor Company.
U 4065 B Preliminary Information, TEMIC Telefunken Semiconductors; Aug. 18, 1994, pp. 1-24.
Munehiro Karasudani, et al., A New Car Tuner System IC, SAE Technical Paper Series, SAE International, International Congress and Exposition, Detroit, Michigan Feb. 26 -Mar. 2, 1990.
Hatada Shigeru
Suzuki Yukio
Bost Dwayne D.
Toko Inc.
Trinh Sonny
LandOfFree
AM radio receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with AM radio receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AM radio receiver will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-945152