Logical circuit reference electric level generating circuitry

摘要

The circuitry is arranged to develop a highly accurate and stable reference electric level voltage and/or current for distribution to a plurality of logical circuits on a semiconductor chip having of the order of a thousand such circuits thereon. An input reference voltage is developed by a source reference circuit and applied to an operational amplifier circuit having "evener" circuitry for substantially equalizing the currents in the input transistors. This evener circuitry is essentially an operational amplifier within an op-amp. It monitors and adjusts feedback voltages. The operational amplifier and evener circuitry drives a reference voltage distribution grid laid out over the semiconductor chip.