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Low Signal Swing Push-Pull Driver

IP.com Disclosure Number: IPCOM000100825D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Banker, DC: AUTHOR [+3]

Abstract

The figure shows an excellent push-pull driver with all the required attributes of previous drivers but with improved performance, less power and a low signal swing. The circuit configuration utilizes a double current switch feature, one which satisfies the current switch requirements of input transistors T1, T2, and reference transistor T5, and the other for transistors T3, T4, and T8. Transistors T9 and T10 are the current source transistors, and T6 and T7 control the up level. The circuit performs NOR logic and provides both output phases.

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Low Signal Swing Push-Pull Driver

       The figure shows an excellent push-pull driver with all
the required attributes of previous drivers but with improved
performance, less power and a low signal swing.  The circuit
configuration utilizes a double current switch feature, one which
satisfies the current switch requirements of input transistors T1,
T2, and reference transistor T5, and the other for transistors T3,
T4, and T8. Transistors T9 and T10 are the current source
transistors, and T6 and T7 control the up level. The circuit performs
NOR logic and provides both output phases.

      To control the amount of noise generated by the driver, a
capacitance has been added between the two collector resistors in the
form of two back-biased diodes D1 and D2, as shown in the figure.
The use of these capacitors restricts the rapid changes in voltage
and current excursions in the circuit.

      In summary, the driver circuit has the attributes of less
power, improved performance, higher density, lower signal swings,
controlled peak currents (delta I), and controlled rates of voltage
changes with time (dv/dt).