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Single Input Driver Circuit

IP.com Disclosure Number: IPCOM000084047D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Danielski, CJ: AUTHOR [+2]

Abstract

This driver circuit utilizes only a single input and does not dissipate power during standby intervals.

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Single Input Driver Circuit

This driver circuit utilizes only a single input and does not dissipate power during standby intervals.

In the operation of the circuit, when the input voltage is at 0 volts, nodes A and C are charged to approximately 8 volts through transistors T1 and T2, respectively, connected as diodes, nodes B and D are held at 0 volts and node E is charged to approximately 6 volts through transistors T2 and T3, each connected as a diode, assuming that +VH is equal to 10 volts.

When the input voltage rises to 10 volts, node C is driven to approximately 15 volts via overlap capacitance C1 of transistor T4 and node B is charged to 10 volts via T4, turning on transistor T5. Transistor T6 is turned on discharging node A and turning off transistor T7.

Although T5 is conducting, the voltage at node D remains for a period of time at a value less than the threshold voltage of transistor T8, since current is flowing into the load capacitor CL, and the dimensions of transistor T9 are such that the threshold voltage of T8 is not reached until node B is fully charged to 10 volts.

When the voltage at node D exceeds the threshold voltage of T8, node E discharges through T8 turning off T9 and node C is pulled down below 10 volts turning off T4 and trapping charge at node B. With T9 off, as well as T7, the output voltage rises rapidly, bootstrapping node B through capacitor CBS from 10 volts to approximately 15 volts, to provide an output voltage of 10 volts acro...