Calibration reference signal generator

Details Calibration reference signal generator Calibration reference signal generator

1981-10-13

1983-11-15

Murray, Richard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 10, 324 76R, H04N 702

Patent

active

044159277

ABSTRACT:
An improved calibration reference signal generator that includes both preset and variable means for generating digital signals corresponding to reference voltage levels. The digital signals are coupled through a chopper switch to a first DAC, which produces a square wave analog signal having an amplitude equal to the desired reference voltage. The digital signals also are coupled directly to a second DAC, which converts at least the most significant bit of the signals to a corresponding offset voltage. An output amplifier combines the square wave signal and offset voltage to produce an output square wave signal with a d.c. offset proportional to the amplitude of the square wave signal. In an alternative mode of operation, the output of the second DAC is disconnected from the output amplifier, which then produces a square wave signal without any offset.

REFERENCES:
patent: 4240100 (1980-12-01), Gorbold et al.

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