Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Patent
1993-03-09
1995-04-04
Cunningham, Terry D.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
327 73, 327108, 327112, 327482, 327483, H03K 604
Patent
active
054040515
ABSTRACT:
A transistor load driving circuit characterized in that fast charge/discharge driving can be realized for a capacitive load with variation made between a large load state and a small load state, without breakdown phenomenon for the output transistors. In load driving circuit 1, there is a totem-pole-type load driving circuit 10 and a rise characteristics control circuit 20, which is connected to resistor C.sub.L by coupling capacitor C.sub.1 and acts as a constant-current functional circuit. In the case with a large load, said totem-pole-type load driving circuit 10 can perform high-speed charge/discharge operations for the load electrostatic capacitance C.sub.L. When the value is small for load electrostatic capacitance C.sub.L, the characteristic curve of totem-pole-type load driving circuit 10 becomes too steep, so that the sustain voltage of the transistor decreases, rise characteristics control circuit (20) acts to limit the collector potential of phase-splitting transistor Q.sub.3, the operation of transistors Q.sub.3, Q.sub.4 is delayed so that the rise characteristics are tempered to avoid the breakdown phenomenon of the transistors.
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Cunningham Terry D.
Donaldson Richard L.
Hiller William E.
Texas Instruments Incorporated
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