Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1997-04-22
2000-11-28
Vo, Nguyen
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455256, 455257, 455310, H04B 110
Patent
active
RE036973&
ABSTRACT:
A radio transceiver having digitally-corrected temperature-compensated crystal oscillators (DTCXOs) including digital frequency temperature compensation circuits that are temporarily suspended from being updated, such that temperature compensation updates that can generate noise during periods of reception and transmission that could interfere with the audio channel and/or signal synchronization will be postponed. Temperature is converted to a digital signal that is then used to address a PROM. The PROM outputs a correction word appropriate for the temperature reading and inputs this to a latch. A timing control loads the latch after data has settled. The latched correction word is connected to a bank of switches and capacitors that trim the frequency of the crystal oscillator. During radio transmission and/or reception, the latch will be suspended from loading any new correction words. The last valid correction word, however, will remain.
REFERENCES:
patent: 4504973 (1985-03-01), April
patent: 5008955 (1991-04-01), Sato
patent: 5025251 (1991-06-01), Mittel et al.
English Abstract of JP-62-102609.
Seiko Epson Corporation
Vo Nguyen
LandOfFree
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