INTEGRATED BUFFER CIRCUITS FOR COUPLING LOW-OUTPUT IMPEDANCE DRIVER TO HIGH-INPUT IMPEDANCE LOAD

摘要

The combination in a common substrate, of a lateral bipolar transistor operated in the common base mode and a field-effect transistor whose source (or drain) electrode is the collector electrode of said bipolar transistor. A signal applied to the emitter of the bipolar transistor causes a current to flow through the conduction channel of the field-effect transistor. The voltage thereby developed at the electrode common to both transistors, even in response to a small signal current, is of sufficient amplitude to drive a high-input impedance load such as other field-effect transistors embedded in the same substrate.