Radio pager having correcting circuit responsive to temperature

Details Radio pager having correcting circuit responsive to temperature Radio pager having correcting circuit responsive to temperature

1996-04-11

1999-03-09

Chin, Tommy P.

Telecommunications

Transmitter and receiver at separate stations

455 381, 455309, 455312, H04B 700, H04Q 302

Patent

active

058813640

ABSTRACT:
In a radio pager capable of receiving a paging signal subjected to multilevel digital frequency modulation, an analog-to-digital converter (ADC) receives a demodulated voltage signal in the form of an analog signal from a demodulator. The ADC functions to define the upper limit of an analog signal conversion range with a first reference voltage and to define the lower limit of the same with a second reference voltage. Even when at least one of the demodulation sensitivity and demodulated center voltage of the demodulated voltage signal changes with a change in temperature and causes the signal to change, the relation between the signal range of the demodulated voltage signal and the analog signal conversion range of the ADC is maintained constant. Therefore, even if the demodulated voltage signal before temperature compensation changes, the ADC is capable of outputting a stable digital signal identical in content or data with an intermediate frequency signal input to the demodulator.

REFERENCES:
patent: 4628272 (1986-12-01), Davis et al.
patent: 5208833 (1993-05-01), Erhart et al.
patent: 5220655 (1993-06-01), Feldt
patent: 5311554 (1994-05-01), Morera et al.
patent: 5564091 (1996-10-01), Goldfinger
patent: 5610950 (1997-03-01), Duch
patent: 5659884 (1997-08-01), Daughtry, Jr. et al.

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