A low-power, bipolar, two's complement serial pipeline multiplier chip

A 4-bit, general-purpose, two's complement serial pipeline multiplier chip has been designed and fabricated in the bipolar GIMIC-O process. The chip can provide the following functions in 24-pin dual-in-line packages: (1) two's complement/two's complement 4-bit serial pipeline multiplier with programmable coefficients, (2) sign magnitude/two's complement 4-bit serial pipeline multiplier with programmable coefficients, (3) 5-bit dynamically programmable adder/subtractor, (4) 2/SUP -K/ scaler; (5) overflow corrector. Packages can be cascaded to provide functions of length greater than 4 bits. Nonsaturating circuit techniques, emitter function logic combined with current-steering trees, are effectively utilized to make high-performance, low-power circuits using a simple bipolar technology. The multiplier circuitry is compatible at inputs and outputs with standard emitter coupled logic and uses a standard -5.2/spl plusmn/10 percent power supply. Fully programmable multiplication at clock rates greater than 20 MHz is achieved with a power consumption of 37.5 mW/bit.