Browse Prior Art Database

Universal Voltage Integrator

IP.com Disclosure Number: IPCOM000047558D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Murcko, RM: AUTHOR

Abstract

Presently, this voltage integrator provides an accurate and quick means to quantify the total contamination present on module substrates or cards. The integrator is connected to suitable apparatus used to extract the contaminants from the substrates or cards. Referring to the schematic, the voltage input Vin is divided by R1 and then inputted to pin 5 of the voltage-to-frequency converter device IC1. The combination of R2, R3 and C set the frequency output of IC1 according to the following equation: fout = v over 10(R2+R3)C R5 controls the offset of IC1 so that for a zero-volt input, the frequency output is zero. A square-wave pulse is available as an open collector output at pin 14 of IC1. R4 is a pull-up resistor producing a 0 V to 5 V clock input signal for the counter and output driver device (IC2).

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 85% of the total text.

Page 1 of 2

Universal Voltage Integrator

Presently, this voltage integrator provides an accurate and quick means to quantify the total contamination present on module substrates or cards. The integrator is connected to suitable apparatus used to extract the contaminants from the substrates or cards. Referring to the schematic, the voltage input Vin is divided by R1 and then inputted to pin 5 of the voltage-to-frequency converter device IC1. The combination of R2, R3 and C set the frequency output of IC1 according to the following equation: fout = v over 10(R2+R3)C R5 controls the offset of IC1 so that for a zero-volt input, the frequency output is zero. A square- wave pulse is available as an open collector output at pin 14 of IC1. R4 is a pull- up resistor producing a 0 V to 5 V clock input signal for the counter and output driver device (IC2). Switch S1 controls whether the display is continuously updated or is latched at the point when the switch was activated. In either position, the counter still counts. Switch S2 resets the counter to zero. Seven- segment displays L1 through L4 are common cathode types, and each display is turned on sequentially via the A, B, C, and D outputs of IC2. These multiplex output signals are buffered through darlington drive transistors TR1 through TR4. In practice, S2 is initially in the reset position and S1 is in the continuously update display mode. When the signal of interest is applied to the input, S2 is switched to count. When the des...