Advanced Micro Devices Corporation

Nader Vasseghi

Donald G Goddard

Hemmige D Varadarajan

Robert E Eccles

An interface circuit (110) for interfacing between an 'OR-tied' connection (P) of a programmable logic array device (10) and a TTL output buffer (36) includes a first bandgap generator (40), a high level clamp circuit (30), a second bandgap generator circuit (42), and a sensing circuit (26). The first bandgap generator (40) generates a first reference voltage (VB1) which has a positive temperature coefficient. The second bandgap generator (42) generates a second reference voltage (VB2) which has a negative temperature coefficient. A resultant base drive current (I.sub.x) is supplied to the base of a phase splitter transistor (Q2) in the output buffer (36). The resultant current (I.sub.x) is controlled by the first and second bandgap generators (40, 42), the current being higher at low temperatures and being smaller at high temperatures.

Temperature-compensated interface circuit between 'OR-tied' connection

Output buffer circuits formed of merged bipolar transistor and CMOS transistors to produce either two output states or three output states includes a plurality of CMOS transistors and a pair of bipolar transistors. The output buffer circuits have high current drive capabilities and low propagation delay.

TTL compatible merged bipolar/CMOS output buffer circuits

Logic circuits formed of merged P-channel MOS transistors and bipolar transistors to produce a single logic gate include a plurality of P-channel MOS transistors and a pair of bipolar transistors. The logic gate circuits have low power dissipation and a large noise margin.

Merged PMOS/bipolar logic circuits

A line driver circuit is formed of a driver circuit section and a receiver circuit section. The driver circuit section provide a low impedance drive for charging and discharging quickly a capacitive load. A receiver circuit section includes an output level-shifting transistor which is adapted for translating a voltage at an output node of the driver circuit section to a compatible higher level.

Growing community of inventors

Mountain View, CA, United States of America

Nader Vasseghi