Abstract :
The paper describes a new type of electronic analogue multiplier-divider, in which a voltage-controlled variable-gain element, based on the field-effect transistor, is shared in time between two circuits. In one circuit, the gain is made proportional to the ratio of two input signals; in the other, it acts on a third input signal to provide the output. Sharing is effected at, for example, a frequency of 1 kc/s, by transistor switches, and the system performs 4-quadrant multiplication and 1-quadrant division. Only one, simple a.c., amplifier is required, and high accuracy can be achieved with input signals having full-scale values as low as 5V and 10¿A.
