Interface circuits including driver circuits with switching nois

Details Interface circuits including driver circuits with switching nois Interface circuits including driver circuits with switching nois

1990-10-16

1992-06-16

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307443, 307263, H03K 19003

Patent

active

051226901

ABSTRACT:
An interface circuit includes a generator for driving an interface signal to a receiver which produces an output signal in response thereto. The generator (or driver) includes a pair of relatively larger complementary conductivity field effect transistors and a pair of relatively smaller complementary conductivity field effect transistors (FETs), each pair in series circuit between the supply rails. The interface signal is produced at a connection of the center points of both pairs of FETs. A control device renders like ones of the FETs in each pair alternately conductive responsive to the input signal, however, the control device generates control signals for the FETs such that the relatively smaller FET of a given conductivity becomes conductive before the larger FET of that same conductivity. The receiver includes a voltage divider to attenuating and coupling the received interface signal to a high-gain amplifier which produces the output signal. Preferably, the signals have amplitudes sufficiently large to cause the interface circuit to operate as a digital interface. Further, it is preferred that two generators of opposite signal sense be employed to produce a differential interface signal, in which case the receiver includes a differential amplifier having opposite signal sense inputs to which the differential signals are applied through a differential voltage divider. In the preferred differential amplifier, opposite signal sense outputs are fed back in the regenerative sense to the two inputs to introduce hysteresis.

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"Electrical Characteristics of Balanced Voltage Digital Interface Circuits," Electronic Industries Assoc. (EIA) Standard RS-422-A dated Dec. 1978, pp. 1-16.
National Semiconductor Data Sheet DS26C31MJ/883 CMOS Quad Tri-State Differential Line Driver, dated Jun. 1991.
National Semiconductor Data Sheet DS26C32AMJ/883 Quad Differential Line Receiver dated Jun. 1990, pp. 1-6.
National Semiconductor Data Sheet DS26LS32C/DS26LS32M/DS26LS32AC/DS26LS33C/DS26LS33M/DS26LS33AC Quad Differential Line Receivers, pp. 1-50 through 1-52.
Texas Instruments Data Sheet AM26LS32AM, AM26LS33AM, AM26LS32AC, AM26LS33AC Quadruple Differential Line Receivers, dated Sep. 1986, pp. 4-13 through 4-21.
Texas Instruments Data Sheet AM26LS31M, AM26LS31C Quadruple Differential Line Drivers, dated Oct. 1986, pp. 4-5 through 4-12.
Natinal Semiconductor Data Sheet DS26LS31C/DS26LS31M Quad High Speed Differential Line Driver, pp. 1-37 through 1-39.
Natinoal Semiconductor "Military RS-422 Products" dated May 1990.

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