Integrated circuit buffer with improved drive capability

Details Integrated circuit buffer with improved drive capability Integrated circuit buffer with improved drive capability

1990-04-25

1992-03-17

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307542, 307475, 307451, 307263, H03K 1716, H03K 1706, H03K 17687, H03K 19003

Patent

active

050971484

ABSTRACT:
An output buffer provides for additional current sinking or sourcing capability by switching in an additional transistor when the output voltage passes a given level. This allows the output buffer to supply DC current to a load without requiring an excessively large AC drive capability, which could undesirably increase switching noise. In a typical embodiment, an inverter senses when the buffer output voltage reaches its switching threshold (approximately V.sub.DD /2), and turns on the additional transistor after a given delay. For example, a CMOS output buffer driving a TTL load may obtain additional current sinking capability by this technique. On-chip buffers (e.g., bus drivers and clock drivers) can also benefit from this technique.

REFERENCES:
patent: 4258272 (1981-03-01), Huang
patent: 4479067 (1984-10-01), Fujita
patent: 4758743 (1988-07-01), Dehganpour et al.
patent: 4760283 (1988-07-01), Weaver
patent: 4918339 (1990-04-01), Shigeo et al.
patent: 4959565 (1990-09-01), Knecht et al.
patent: 4961010 (1990-10-01), Davis

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