Browse Prior Art Database

Inductor Voltage to Frequency Converter

IP.com Disclosure Number: IPCOM000094970D
Original Publication Date: 1965-Jul-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Wangberg, HG: AUTHOR

Abstract

The circuit generates a current pulse which has a fixed amount of charge if the output voltage is substantially zero. The output voltage is substantially zero if the circuit is connected to a Miller integrating circuit. The circuit includes inductor L, diodes D1 and D2, resistors R1...R5, zener diode Z1, capacitor C1 and transistor T1.

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Inductor Voltage to Frequency Converter

The circuit generates a current pulse which has a fixed amount of charge if the output voltage is substantially zero. The output voltage is substantially zero if the circuit is connected to a Miller integrating circuit. The circuit includes inductor L, diodes D1 and D2, resistors R1...R5, zener diode Z1, capacitor C1 and transistor T1.

If a negative pulse is applied to the input, T1 stops conducting and a positive current pulse appears at the output. The current pulse at the output has a fixed amount of charge which, for example, can be used to increase or decrease the amount of charge on a capacitor by a fixed amount. This assumes that the output voltage is kept at zero. Diode Z1 maintains a constant voltage between lines A and B. Diode D2 prevents current from flowing through line B from inductor L. When the input is kept at the -V level, current I1 flows through inductor L and resistor R2, resistor R4 and transistor T1.

The magnitude of this current is primarily controlled by the magnitude of R2 and the voltage of diode Z1. When the input is pulsed, cutting off current flow through T1, current 12 flows to the output. The amount of the charge can be roughly calculated according to the equation given beneath the circuit. In a given equation, the term V indicates the voltage of the point C when the input is kept at the -V level. The terms L, R1 and R2 indicate the values of the respectively indicated components.

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