Circuit for generating a trapezoidal current waveform with matched rise and fall times
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United States of America Patent
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Jan 23, 1990
Grant Date -
N/A
app pub date -
Aug 4, 1987
filing date -
Aug 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A transceiver device has a transmitter circuit for transmitting data from a local data terminal to a computer network. The transmitter circuit has a voltage-to-current converter including a voltage divider with a plurality of voltage threshold taps, each voltage tap having a fixed voltage level; and a plurality of differential current switches each having first and second differential inputs, and a current differential output. Each of the first differential inputs is connected in common for receiving a voltage signal, and the second differential inputs are connected to an associated one of the voltage threshold taps. The current switch outputs are directly connected to a common node, to provide a current signal stepwise the same as the voltage signal. Preferably the common node is connected to a current amplifier including a simple filter. The output current waveform is preferably a trapezoidal waveform having matched rise and fall times.
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