Analog to digital interface circuit with internal resistance com

Details Analog to digital interface circuit with internal resistance com Analog to digital interface circuit with internal resistance com

1992-08-04

1994-10-25

Wolfe, Willis R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328162, 32420712, 324225, G01B 714, G01N 2772, H03K 5153

Patent

active

053592387

ABSTRACT:
An interface circuit for connecting a signal source [10], such as a variable reluctance sensor, to a digital circuit [20] such as a microprocessor. A comparator [40] generates a logic signal [at 49] indicating whether the signal from the source is greater than or less than the signal's average value. The inputs to the comparator are connected across a pair of back-to-back diodes [44,46] which are serially connected with a current limiting resistor [42] between the source and the output of an operational amplifier [35] which generates an average value voltage. The operational amplifier's output is directly connected to its negative input so that it exhibits unit gain, and the operational amplifier's input is connected to the sensor voltage by a low-pass filter [32,34] so that amplifier responds only to the DC content of the sensor's output signal. A second comparison circuit [50] continuously monitors the average value signal from the operational amplifier and generates a logical fault signal [at 56] whenever that average value signal lies outside a predetermined range of acceptable values.

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patent: 5107210 (1992-04-01), Shirao et al.
patent: 5175748 (1992-12-01), Takahashi

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