Universal Voltage Integrator
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
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).