Circuit for generating a trapezoidal current waveform with match

Details Circuit for generating a trapezoidal current waveform with match Circuit for generating a trapezoidal current waveform with match

1987-08-04

1990-01-23

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

363 73, 307261, H04B 138, H04L 516

Patent

active

048963330

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.

REFERENCES:
patent: 3898571 (1975-08-01), Caprio
patent: 4375082 (1983-02-01), Lohrmann
patent: 4408268 (1983-10-01), Peters et al.
patent: 4429235 (1984-01-01), Minner
patent: 4539491 (1985-09-01), Nishioka et al.
patent: 4571507 (1986-02-01), Collings
patent: 4618814 (1986-10-01), Kato et al.
patent: 4645946 (1987-02-01), Ishikawa et al.
patent: 4675594 (1987-06-01), Reinke
patent: 4675651 (1987-06-01), Marbot et al.
patent: 4686385 (1987-08-01), Sharpe
patent: 4725788 (1988-02-01), Lodahl

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