Page 439 - Op Amps Design, Applications, and Troubleshooting

Multipliers/Dividers 415

FIGURE 11.8 The AD532 connected
as a simple multiplier circuit.

FIGURE 11.9 Oscilloscope display showing the actual behavior of the circuit shown in Figure
11.8. (Test equipment courtesy of Hewlett-Packard Company.)

The multiplier circuit can also be configured to perform several other math-
ematical operations, including division, squaring, and square root functions. Fig-
ures 11.10,11.11, and 11.12 show the connections required to utilize the AD532 to
achieve these other functions.
Still another interesting application of the basic multiplier circuit can be
demonstrated by applying the same sinusoidal waveform to both multiplier
inputs, in which case the output will be a sinusoidal waveform with a frequency
that is exactly double the input frequency. Thus, the multiplier circuit can be used
as a frequency doubler without resorting to the use of tuned tank circuits.