A wide-band technique for vector summation and RMS-DC conversion

A circuit configuration is presented for wideband analog computation of both the vector-sum function and the RMS-DC conversion function. Design of the circuit is based on a systematic approach to translinear circuit synthesis. Errors due to finite transistor current gain are compensated by means of a novel technique. Measured performance results based on an experimental monolithic implementation in a standard bipolar process are presented. Bandwidths of 25 and 80 MHz are achieved for vector summation and RMS-DC conversion, respectively.