Device for rejection of the image signal of a signal converted t

Details Device for rejection of the image signal of a signal converted t Device for rejection of the image signal of a signal converted t

1995-05-24

1997-10-14

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455285, H04B 110

Patent

active

056782209

ABSTRACT:
In a device for rejecting the image signal of a signal converted to a predetermined intermediate frequency, a local oscillator supplies a local signal at a frequency chosen according to the frequency of the signal and the intermediate frequency. A first phase-shifter has two passive phase-shifter cells including resistive and capacitive components and respectively connected to the output of the oscillator to supply two mixer signals in phase quadrature. Two mixers receive an input signal containing a signal and its image signal and a respective mixer signal and supply two intermediate signals at the intermediate frequency. A second phase-shifter comprises two passive phase-shifter cells comprising resistive and capacitive components and respectively connected to the outputs of the two mixers to introduce a further phase quadrature relationship between the two intermediate signals. A summing device connected to the outputs of the two passive phase-shifter cells of the second phase-shifter eliminates the image signal.

REFERENCES:
patent: 2964622 (1960-12-01), Fire
patent: 3575660 (1971-04-01), Jorgensen
patent: 4243955 (1981-01-01), Daniel et al.
patent: 4531236 (1985-07-01), Ishibara
patent: 4731875 (1988-03-01), Mizukami et al.
IEEE International Solid State Circuits Conference, vol. 36 Feb. 1993, New York pp. 144-145.
Microwave Journal, vol. 29, No. 10, Oct. 1986 Norwood US pp. 141-149.

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