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Field Effect Transistor Driver Circuit

IP.com Disclosure Number: IPCOM000084045D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Kruggel, RH: AUTHOR [+2]

Abstract

This driver circuit produces an output voltage for a capacitive load CL with a magnitude equal to the supply voltage +V in one continuous transition.

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Field Effect Transistor Driver Circuit

This driver circuit produces an output voltage for a capacitive load CL with a magnitude equal to the supply voltage +V in one continuous transition.

Capacitor IC is a diffusion inversion layer capacitor.

In operation, a phi 1 pulse is applied to transistors T1 and T2 to charge node C, with the output held at ground by T2. Phi 1 pulse turns off and phi 2 pulse is applied to transistors T3 and T4, charging node A and discharging node C. The charge on node A turns on transistor T5.

Charge from node A and through T5 provides a charge to node B, however, in view of the design of capacitor IC, the discharging of node C couples out of node B the charge being delivered to node B from node A and through T5. Hence, the output remains at ground while node A is being charged through T3. After node C is fully discharged, the inversion layer disappears and the capacitance of IC becomes very small, allowing the voltage across the load capacitor CL at the output to rise rapidly to +V with the aid of the bootstrap capacitor CBS.

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