Analog ramp generator with digital correction

Details Analog ramp generator with digital correction Analog ramp generator with digital correction

1993-02-17

1994-09-13

Callahan, Timothy P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307227, 307228, 307494, H03K 600, H03K 408

Patent

active

053471768

ABSTRACT:
An analog ramp signal is used to control the frequency of a swept radio-frequency (RF) test oscillator. The analog ramp signal is generated by applying a fixed reference voltage to an analog integrator circuit. However, ramp accuracy is degraded by integrator gain error, drift, and nonlinearity. To correct for these errors, the analog ramp signal is periodically compared to a digital ramp signal generated by a digital-to-analog converter (DAC) during the course of a sweep. Preferably, the analog ramp signal is compared to the digital ramp signal many times during the course of the sweep. The difference between the two ramp signals is scaled and combined with the reference voltage to correct the slope of the analog ramp signal. An additional DAC preferably adjusts the gain of the feedback loop.

REFERENCES:
patent: 3826928 (1974-07-01), Bucek et al.
patent: 3950706 (1976-04-01), Wilson
patent: 4581585 (1986-04-01), Bristol

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