Radio receiver having temperature compensated voltage controlled

Details Radio receiver having temperature compensated voltage controlled Radio receiver having temperature compensated voltage controlled

1997-11-13

2000-02-15

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

455343, 4551911, 375327, H04B 700

Patent

active

060262788

ABSTRACT:
In a radio receiver, a voltage-controlled crystal oscillator of a radio frequency section produces a local carrier for mixing it with a received radio signal to produce an analog output signal. A threshold decision circuit comprising an average circuit and a comparator compares this output signal with a decision threshold and produces a digital signal. A synchronization detector produces an in-sync signal when a synchronization bit pattern is present in the digital signal. Otherwise, it produces an out-of-sync signal. The radio-frequency section is periodically activated and deactivated by power saving pulses. Frequency control circuitry varies a control voltage applied to the voltage-controlled crystal oscillator by a predetermined amount if a predetermined number of the power saving pulses is produced after the instant the out-of-sync signal is produced. The control voltage will be varied if the same number of power saving pulses is produced again in the presence of the out-of-sync signal after the control voltage was varied previously. The control voltage is maintained at a level which is obtained at the instant the in-sync signal is produced.

REFERENCES:
patent: 4348772 (1982-09-01), Leland et al.
patent: 5440298 (1995-08-01), Kuramatsu
patent: 5548823 (1996-08-01), Hirasawa et al.
patent: 5606739 (1997-02-01), Goto
patent: 5613235 (1997-03-01), Kivari et al.
patent: 5706315 (1998-01-01), Ogoro
patent: 5734686 (1998-03-01), Kuramatsu
Japanese Office Action dated Jan. 19, Hei 11 with English language translation of Japanese Examiner's comments.

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