Unbuffered TTL-to-ECL translator with temperature-compensated th

Details Unbuffered TTL-to-ECL translator with temperature-compensated th Unbuffered TTL-to-ECL translator with temperature-compensated th

1986-08-28

1988-04-05

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

323314, 323907, 307455, 307310, 307296R, H03K 19092, H03K 19003, H03K 1714, G05F 316

Patent

active

047361255

ABSTRACT:
A circuit for translating TTL-to-ECL-type signals utilizes an unbuffered emitter-coupled transistor pair for shifting signal levels. The emitter-coupled transistor pair operates by switching a current from a current-source transistor, with the switching being performed against a temperature-compensated threshold voltage that is derived from a reference voltage provided to the current source transistor. Direct, unbuffered switching of the emitter-coupled transistor pair insures rapid, symmetrical response to the TTL signals that drive the transistor pair and produces high-quality, relatively undistorted ECL waveforms. Provision of a current-source reference voltage stabilized with respect to temperature also contributes to reduction of distortion in the ECL waveforms. The threshold voltage is obtained from the current source reference voltage through a current mirror circuit.

REFERENCES:
patent: 3758791 (1973-09-01), Taniguchi et al.
patent: 3986045 (1976-10-01), Lutz
patent: 4329597 (1982-05-01), Yamagiwa
patent: 4339822 (1982-07-01), Kolodzey
patent: 4368395 (1983-01-01), Taylor
patent: 4533842 (1985-08-01), Yang et al.
patent: 4540900 (1985-09-01), Early et al.
patent: 4599521 (1986-07-01), Kanai et al.
patent: 4658205 (1987-04-01), Yamada
patent: 4684831 (1987-08-01), Kruest
"F100K ECL Data Book"-Fairchild Camera and Instrument Corporation, 1982, pp. 2-7.

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