Arrangement for compensating for temperature dependent performan

Details Arrangement for compensating for temperature dependent performan Arrangement for compensating for temperature dependent performan

1992-06-05

1993-04-20

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455264, 455307, 455316, 331176, H04B 126

Patent

active

052049728

ABSTRACT:
A first control circuit is provided with a temperature detector and a memory in which temperature related control data is stored. The control circuit outputs a control signal, which varies with ambient temperature, to a local oscillator which is connected with a mixer. The mixer receives an incoming radio frequency signal and a local frequency signal from the local oscillator and outputs an IF signal. The local oscillator is controlled in a manner wherein the frequency of the IF signal parallels the temperature dependent shift in center frequency of a surface acoustic wave type IF filter. The IF signal is applied to a second mixer to which a second control circuit is coupled. The second control circuit maintains the output of the second mixer at a predetermined value to compensate for the first IF's frequency shift caused by the first control circuit.

REFERENCES:
patent: 4262361 (1981-04-01), Hauer
patent: 4551856 (1985-11-01), Victor et al.
patent: 4575761 (1986-03-01), Carlson et al.
patent: 4611181 (1986-09-01), Fukumura et al.
patent: 4644297 (1987-02-01), Olds
patent: 4703520 (1987-10-01), Razanski et al.
patent: 4910473 (1990-03-01), Niwa
patent: 4921467 (1990-05-01), Lax

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