Low noise communication bus driver

Details Low noise communication bus driver Low noise communication bus driver

1990-10-18

1992-11-17

Howell, Janice A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307268, 307263, 307492, 328145, H03K 500, H03K 512, H06F 7566, G06G 724

Patent

active

051646110

ABSTRACT:
This invention relates to a waveshaping circuit for producing a bus output voltage signal having a substantially sinusoidal rising transition from a low voltage level to a high voltage level in response to the rising edge of a data input signal, and a substantially sinusoidal falling transition from said high voltage level to said low voltage level, in response to the falling edge of said data input signal. The circuit uses AC coupling to control the waveshaping. This allows the circuit to operate with a large ground offset voltage difference between circuit ground and bus ground. An exponential current source provides a current to a regulator bus driver which charges and discharges a capacitor in response to the the rising edge or falling edge on the data input signal. The current increases exponentially in response to the rising or falling edge on the data input signal and then decreasing exponentially when the bus output signal reaches one-half of its intended full voltage swing or falls below one-half the full voltage swing to respectively produce the sinusoidal rising and falling voltage at the bus output. The regulator bus driver regulates the voltage at the bus output when the voltage reaches the intended full voltage. The regulator bus driver circuit creates it own regulated high voltage level over supply variations from 9-16 volts.

REFERENCES:
patent: 4327249 (1982-04-01), Rademaker
patent: 4437021 (1984-03-01), Sumi et al.
patent: 4593206 (1986-06-01), Neidorff et al.
patent: 4896333 (1990-01-01), Can
patent: 4947058 (1990-08-01), Yarbrough et al.
patent: 4987324 (1991-01-01), Wong et al.
patent: 5028818 (1991-07-01), Go Ang et al.

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