Method and apparatus for automatic tuning calibration of electri

Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver

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455266, 455340, H04B 1700

Patent

active

058226877

ABSTRACT:
A method and apparatus for automatic tuning calibration of electronically tuned filters which comprises a programmable frequency generator for producing a calibration frequency signal, a filter for filtering the calibration frequency signal, a detector for producing a detector voltage, a processor for programming the frequency generator to specific test frequencies and for producing a stepped filter tuning voltage and storing the detector voltage in response to the stepped filter tuning voltage, and a converter for digital-to-analog conversion of the stepped filter tuning voltage. Calibration frequency signal versus tuning voltage responses are stored for a number of calibration iterations within the usable range of the filter and the resulting table can be used to determine the correct tuning voltage for the filter when operating at any frequency within the usable filter range.

REFERENCES:
patent: 4334323 (1982-06-01), Moore
patent: 4368541 (1983-01-01), Evans
patent: 4685150 (1987-08-01), Maier
patent: 5031131 (1991-07-01), Mikos
patent: 5101509 (1992-03-01), Lai

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