Voltage controlled oscillator with correction of tuning curve no

Details Voltage controlled oscillator with correction of tuning curve no Voltage controlled oscillator with correction of tuning curve no

1991-03-29

1993-01-12

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4552601, 455264, H04B 700

Patent

active

051797259

ABSTRACT:
A scanning-superhetrodyne ESM receiver having a VCO for a local oscillator which is linearized and temperature compensated. A stable combline oscillator is used to generate known frequency signals which are frequency converted to an intermediate frequency (IF) using the local oscillator and frequency converter(mixer). The frequency of each combline signal is measured and a table of known voltage/frequency points is generated. The table is input to a Cubic Spline program which computes the coefficients for the best-fit third order polynomial for each pair of data points. When a particular local oscillator frequency is desired, the corresponding tune voltage is computed by solving the polynomial equation for the given frequency range. By repeating the calibration on a periodic, or an "as needed" basis, temperature compensation is achieved.

REFERENCES:
patent: 4077008 (1978-02-01), Rast et al.
patent: 4078212 (1978-03-01), Rast
patent: 4198604 (1980-04-01), Holdaway
patent: 4641101 (1987-02-01), Selim
patent: 4719649 (1988-01-01), Woodsum
patent: 4728906 (1988-03-01), Turl et al.
patent: 4823399 (1989-04-01), George
patent: 4921467 (1990-05-01), Lax
patent: 5029181 (1991-07-01), Endo

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