Radio signal reception with a PLL frequency controlled for an IF

Details Radio signal reception with a PLL frequency controlled for an IF Radio signal reception with a PLL frequency controlled for an IF

1994-06-06

1996-10-08

Faile, Andrew

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455260, 455266, 455296, 455316, 375327, H04B 126

Patent

active

055640990

ABSTRACT:
In a radio receiver a PLL oscillator generates a phase locked oscillation signal with a controllable frequency and a frequency multiplier multiplies the controllable frequency with a controllable factor into a local oscillation frequency to provide a local oscillation signal for mixing into an IF signal with a radio signal reaching the receiver, the IF signal is monitored to raise the controllable frequency and to reduce the controllable factor when a spurious signal coexists with the radio signal. This coexistence is detected by monitoring a level difference between the IF signal and an output signal of an IF filter. Preferably, the oscillator comprises in a PLL two VCO's for generating phase locked oscillation signals of higher and lower oscillation frequencies, such as 260 and 65 MHz, and a controllable prescaler supplied with high and low voltage signals when the VCO's are put in operation at the higher and the lower oscillation frequencies. Concurrently, the controllable factor is controlled to factors of unity and four.

REFERENCES:
patent: 4521918 (1985-06-01), Challen
patent: 4777655 (1988-10-01), Numata et al.
patent: 4817197 (1989-03-01), Shimizu et al.
patent: 4918403 (1990-04-01), Martin
patent: 5109544 (1992-04-01), Mittel et al.
patent: 5204972 (1993-04-01), Hashimoto
patent: 5263197 (1993-11-01), Manjo et al.
patent: 5361407 (1994-11-01), Sawada et al.
patent: 5402446 (1995-03-01), Minami

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