Abstract Transistor switching circuitry, such circuitry including an input transistor and an output transistor coupled one to the other in a ''''Darlington'''' configuration is shown. The input transistor is coupled to a control signal source through a first gating arrangement and the output transistor is coupled to the control signal source through a second gating arrangement and a voltage storage element. The output transistor is driven ''''on'''' in response to a turning ''''on'''' signal from both the input transistor and the second gating arrangement. During the time the output transistor is ''''on,'''' a voltage is stored by the voltage storage element, the level of such stored voltage approaching the voltage level of a voltage supply. When an ''''off'''' control signal is transmitted, the voltage storage element is coupled between the base-emitter electrodes of the output transistor, thereby rapidly to deplete the number of minority carriers in the output transistor and render it more quickly responsive to the ''''off'''' control signal.
Transistor switching circuitry comprising: an output transistor having an emitter electrode, A collector electrode coupled to a load and a base electrode coupled to a source of binary signals through a first and second path, such first path including means for driving such output transistor in accordance with binary signals and the second path including switching means responsive to the binary signals for coupling a power supply to the base electrode in response to a first state of the binary signals and for coupling the base electrode to the emitter electrode in response to a second state of the binary signals, such second path including additionally a voltage storage element disposed between the switching means and the base electrode, such voltage storage element being coupled to the power supply when the switching means responds to the first state of the binary signals and being coupled between the base electrode and the emitter electrode when the switching circuitry responds to the second state of the binary signals.
Claim 2
Dependent Claim
166 words
Transistor switching circuitry comprising: an output transistor having an emitter electrode, A collector electrode coupled to a load and a base electrode coupled to a source of binary signals through a first and second path, such first path including means for driving such output transistor in accordance with binary signals and the second path including switching means responsive to the binary signals for coupling a power supply to the base electrode in response to a first state of the binary signals and for coupling the base electrode to the emitter electrode in response to a second state of the binary signals, such second path including additionally a voltage storage element disposed between the switching means and the base electrode, such voltage storage element being coupled to the power supply when the switching means responds to the first state of the binary signals and being coupled between the base electrode and the emitter electrode when the switching circuitry responds to the second state of the binary signals.
Claim 3
Dependent Claim
16 words
The transistor switching circuitry recited in claim 1 wherein the voltage storage element is a capacitor.
Claim 4
Dependent Claim
57 words
The transistor switching circuitry recited in claim 1, including an input transistor, disposed in the first path, such input transistor having a base electrode coupled to the source of binary control signals, an emitter electrode coupled to the base electrode of the output transistor and a collector electrode coupled to the collector electrode of the output transistor.
Claim 5
Dependent Claim
39 words
The transistor switching circuitry recited in claim 3 including a differentiator disposed in the first path, such differentiator having an input terminal coupled to the computer and an output terminal coupled to the base electrode of the input transistor.