Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent
1993-08-23
1998-10-13
Vo, Nguyen
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
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
Bickley Robert Henry
Pickett Michael Newton
Botsch Bradley J.
Motorola Inc.
Nehr Jeffrey D.
Vo Nguyen
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