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Low Voltage to High Voltage Translator

IP.com Disclosure Number: IPCOM000083352D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Cassani, J: AUTHOR [+2]

Abstract

This circuit, employing field-effect transistors, provides a high-output voltage with a fast rise time from a relatively low-input voltage, without dissipating direct-current power. This output voltage is very suitable as an input voltage to a high-voltage driver circuit.

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Low Voltage to High Voltage Translator

This circuit, employing field-effect transistors, provides a high-output voltage with a fast rise time from a relatively low-input voltage, without dissipating direct- current power. This output voltage is very suitable as an input voltage to a high- voltage driver circuit.

The circuit shown in Fig. 1 is associated with the pulse program indicated in Fig. 2. The start pulse, which may be 4 volts, is turned on after the stop pulse is turned off. The differentiator circuit produces a differential voltage from the leading edge of the start pulse, which turns on transistor T1 for a relatively short period of time.

With T1 on, the voltage at node B which normally is at voltage VH, due to the T2 diode arrangement with T3 and bootstrap capacitor C1, drops to a low value of approximately 1 volt. As T1 turns off node B returns to VH, e.g., approximately
8.5 volts, due to the bootstrap action of C1 at the gate of T3.

The start pulse is also applied simultaneously to the gate of T4 to precharge node C. As node B is returning to VH after differential voltage A is terminated, capacitor C2 connected to T5 provides a bootstrapping action which raises the voltage at the gate of T5 to a magnitude in excess of VH, producing at the output a voltage equal to approximately VH.

The output voltage VH is terminated by applying the stop pulse to the gates of T6 and T7, which effectively ground node C and the output, respectively. The circuit is now...