Oscillators – Automatic frequency stabilization using a phase or frequency... – Search sweep of oscillator
Patent
1995-05-24
1996-09-17
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Search sweep of oscillator
331178, 327132, 327137, H03B 2300
Patent
active
055572413
ABSTRACT:
An ultra-linear chirp generator includes a voltage controlled oscillator (VCO) having a tuning characteristic which is naturally nonlinear, a linear ramp generator which generates a linearly ramping output signal having a linear slope characteristic with respect to time, a polynomial correction waveform generator which generates a polynomial correction signal, and a summer which is responsive to and sums the linearly ramping output signal and the polynomial correction signal. The summer generates a VCO tuning signal for tuning the VCO. The tuning signal corresponds to the linearly ramping output signal predistorted with a nonlinearity opposite to the natural nonlinearity of the VCO tuning characteristic. The linear chirp generator also includes a phase locked loop which is responsive to the output signal of the VCO and which has a reference frequency which is related to the repetition rate of the output signal of the VCO.
REFERENCES:
patent: 3530399 (1970-09-01), Goggins, Jr.
patent: 3699448 (1972-10-01), Martin et al.
patent: 4245196 (1981-01-01), Peebles, Jr. et al.
Ail Systems, Inc.
Grimm Siegfried H.
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