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Complementary Power Driver Disclosure Number: IPCOM000094972D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 34K

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This power driver employs emitter followers to achieve bilateral load current flow.

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Complementary Power Driver

This power driver employs emitter followers to achieve bilateral load current flow.

Transistors T10 and T12 are connected in the current switch configuration. The base of T12 is grounded. The base of T10 is utilized as the input terminal. A down logical input applied to T10 renders it nonconductive and forces T12 into conduction. An up logical input renders T10 conductive, with the resultant current diversion causing nonconduction in T12.

Transistors 14 and 16 are emitter-follower stages. These drive the base terminals of current switching transistors T18 and T20, respectively. The circuit outputs are taken across resistors 22 and 24 via terminals 26 and 28.

If an up logical level is applied to render T10 conductive T12 switches to nonconduction with an attendant rise in its collector potential. This, in turn, allows T16 to conduct current into the base of T20, turning it on, and at the same time, to conduct current via conductor 30 into resistor 24. The conduction of T20 draws current from resistor 22 via conductor 32. The result is a rise in potential at terminal 28 and a fall in potential at terminal 26. Not only does this action provide complementary signals at terminals 26 and 28, but it also aids in discharging any load capacities which are charged by a previously occurring circuit operation.

When a down logical level is applied to T10, the circuit's operation is the reverse of that above explained. In this case, T18 pulls current...