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Analog To Digital Converter

IP.com Disclosure Number: IPCOM000091639D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Skarshinski, L: AUTHOR

Abstract

This analog-to-digital converter includes a network of voltage comparator circuits and summing circuits. An input voltage Vin is compared relative to a reference voltage Vr. Vin is applied through terminal 12 to the voltage comparator circuits 1...5. Vin is compared with Vr/2 in comparator 1. If Vin is greater than Vr/2, a voltage Vr is produced. If Vin is less than Vr/2, a zero voltage is produced.

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Analog To Digital Converter

This analog-to-digital converter includes a network of voltage comparator circuits and summing circuits. An input voltage Vin is compared relative to a reference voltage Vr. Vin is applied through terminal 12 to the voltage comparator circuits 1...5. Vin is compared with Vr/2 in comparator 1. If Vin is greater than Vr/2, a voltage Vr is produced. If Vin is less than Vr/2, a zero voltage is produced.

The output of comparator 1 is applied to summing circuit 6 where it is added to Vr/2. The sum is divided in half producing either 3Vr/4 or 1Vr/4 depending on the output of comparator 1. The output of circuit 6 is applied to comparator 2 where it is compared with Vin. If Vin is greater, a voltage Vr output is produced from comparator 2. If Vin is less, a zero voltage is produced. The output of comparator 2 is applied to summing circuit 7 along with the output of circuit 6 where an additional halving again occurs. The described operation is continued in the remaining comparators and summing circuits in the network. The outputs of the comparators 1...5 are either Vr or zero voltages. These represent 1 or 0 bits which provide the digital value of voltage Vin.

Assume that Vr is 32 volts and Vin is 27 volts. Vr/2 is therefore 16 volts which is less than Vin and the output of comparator 1 is Vr, a 1 bit. The output of circuit 6 is (32+16)/2 = 24 volts which is less than Vin. Thus the output of comparator 2 is Vr, 1 bit. The output of circuit 7 is...