System for linearizing sweep of voltage controlled oscillator

Details System for linearizing sweep of voltage controlled oscillator System for linearizing sweep of voltage controlled oscillator

1982-09-30

1985-02-12

LaRoche, Eugene R.

Oscillators

With frequency calibration or testing

331 4, 331178, H03L 100

Patent

active

044994354

ABSTRACT:
Non-linearities in the sweep output of a voltage controlled oscillator are automatically linearized by a scheme that compensates for changes in slope of the variation in frequency with time during a high accuracy calibration mode, prior to placing the VCO into real time operation. During the calibration mode the sweep rate of the VCO is slowed down as the operational frequency range of interest is divided into a prescribed number of subfrequency segments or windows. During each window, an input control code, obtained from a random access memory (RAM) and representative of the intended slope of the VCO frequency sweep (for that window of interest), is applied to a digital-to-analog converter (DAC) whose output is integrated and applied to the voltage control input of the VCO. Since the output of the DAC is integrated, the frequency variation control signal to be applied to the VCO is a slope change control signal, which is incrementally adjusted, as required, during successive sweeps of the VCO, so as to produce a precompensated control voltage that will cause the rate of change of the VCO frequency output to track an intended ramp (linear with time) or other chosen frequency variation output.

REFERENCES:
patent: 3764933 (1973-10-01), Fletcher et al.
patent: 4129832 (1978-12-01), Neal et al.
patent: 4349789 (1982-09-01), Kurihara

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