Radio receiver and method of calibrating same
US5701600A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1995 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Jul 17, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.