BiCMOS logic gate

Details BiCMOS logic gate BiCMOS logic gate

1996-03-11

1998-04-14

Westin, Edward P.

Electronic digital logic circuitry

Function of and, or, nand, nor, or not

Bipolar and fet

327207, 326115, H03K 19082, H03K 19094

Patent

active

057397031

ABSTRACT:
In order to provide a high speed, stable and low voltage swing logic gate highly applicable to a low-cost BiCMOS process, a BiCMOS logic circuit of the disclosed invention has a pair of MOS transistors, the gates of which are supplied with complementary logic input signals, and the sources of which are coupled together and are supplied with a constant current. The constant current source used may include a bipolar transistor controlled by a reference voltage. Additionally, the constant current source may be a current mirror. The BiCMOS logic circuit of the disclosed invention has a complementary logic output signal. The voltage swing of the complementary logic output signal are determined by the reference voltage and resistance ratio of resistors in the circuit, so that the output voltage swing is independent of power supply fluctuation or temperature change.

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