Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1995-07-17
1997-12-23
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455258, H04B 116
Patent
active
057016003
ABSTRACT:
A method of calibrating a radio receiver (100) which has a desired IF center frequency (fo) includes generating and applying to the receiver's demodulator (126) a plurality of reference signals. The demodulated reference signals are used to generate, for the demodulator, a transfer function that is predictive of amplitude versus frequency characteristics of signals to be demodulated by the demodulator (126). The transfer function (202) is used to determine a frequency offset between a received signal's intermediate frequency and the desired frequency fo. The determined frequency offset is used to adjust the IF frequency of the received signal towards the desired frequency fo. The adjustment process preferably continues until the frequency offset is below a desired threshold. A receiver using the disclosed method is also described.
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Ahrens Art
Carsello Steve
Fernandez Virgilio Alejandro
Simmons John Wayne
Wetters John
Banks-Herold Marsha D.
Eisenzopf Reinhard J.
Moore John H.
Motorola Inc.
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