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

1992-09-08

1993-09-07

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 19, 331 30, 331 40, 331 44, H03L 100, H03L 7085

Patent

active

052433021

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 combine 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: 3155919 (1964-11-01), Baxter et al.
patent: 3427561 (1969-02-01), Hamer
patent: 4442412 (1984-04-01), Smith et al.
patent: 4518930 (1985-05-01), Rozema et al.
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4728906 (1988-03-01), Turl et al.
patent: 5079522 (1992-01-01), Owen et al.

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