Unbuffered TTL-to-ECL translator with temperature-compensated threshold voltage obtained from a constant-current reference voltage
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United States of America Patent
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Apr 5, 1988
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N/A
app pub date -
Aug 28, 1986
filing date -
Aug 28, 1986
priority date (Note) -
Expired
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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.
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