CMOS DATA PATH AND BICMOS OUTPUT BUFFER CIRCUIT HAVING BI-POLAR CURRENT AMPLIFIER

摘要

PURPOSE: To connect the advantage of the low power requirements and high speed processing of a CMOS transistor with the advantage of the low capacitance and high current amplification of a bi-polar transistor, and to obtain high input impedance and low output impedance. ;CONSTITUTION: A BICMOS output buffer circuit in which a CMOS transistor and a bi-polar transistor are integrated is connected between a high potential power rail VCCQ and a low potential power rail GNDN. A bi-polar output stage is formed of bi-polar output pull-up Q24 and Q22 and pull-down Q44 transistor through which relatively large currents are allowed to pass which are connected with an output V. A CMOS transistor including a CMOS input stage connected with an input V brings relatively high input impedance. The bi-polar output stage operates the current amplification of a data signal from a data signal path formed of the CMOS transistor. The input threshold voltage level of each pull-up and pull-down pre-driving input stage is shifted.;COPYRIGHT: (C)1993,JPO