A function generator using hybrid techniques

The principle of operation of a novel function generator is outlined and some applications are reviewed. The basic function produced by the generator is a `box-car¿, or discrete, type function having fixed thresholds with respect to the input voltage, and output voltage levels that may be independently set in any segment. By using a sampling technique, linear interpolation may be applied across any of the discontinuities in the `boxcar¿ function to produce an `analogue¿, or continuous type function. This arrangement allows for the independent adjustment of the value of the function for input voltages midway between the threshold voltages. In the discrete mode, good accuracy is maintained for full amplitude input swing up to 80 kHz and in the continuous mode up to 5 kHz.