Circuit for generating a trapezoidal current waveform with matched rise and fall times
US4896333A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1987 |
| Grant date | Jan 23, 1990 |
| Priority date | — |
| Expiry date | Aug 4, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/94
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.