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Inverse Function Digital To Analog Converter

IP.com Disclosure Number: IPCOM000090669D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Baumann, DD: AUTHOR

Abstract

In this digital-to-analog converter, the input is a digital number from a digital register. The output is an analog voltage that is a function of the reciprocal of the input number. SW1...SWn are transistor switches which are closed if a 1 is applied and open if a 0 is applied. All transistor switches are connected to constant current source 5 so as to pass current through the switch when a 1 is applied. Resistor 1 has a value of R resistor 2 of 2R, resistor 3 of 4R and resistor 4 has a value of 2/n/ x R. The most significant bit is applied to SW1. The second most significant bit is applied to SW2. The third most significant bit is applied to SW3. The least significant bit is applied to switch SWn. These switches and source 5 are connected to buffer amplifier 6.

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Inverse Function Digital To Analog Converter

In this digital-to-analog converter, the input is a digital number from a digital register. The output is an analog voltage that is a function of the reciprocal of the input number. SW1...SWn are transistor switches which are closed if a 1 is applied and open if a 0 is applied. All transistor switches are connected to constant current source 5 so as to pass current through the switch when a 1 is applied. Resistor 1 has a value of R resistor 2 of 2R, resistor 3 of 4R and resistor 4 has a value of 2/n/ x R. The most significant bit is applied to SW1. The second most significant bit is applied to SW2. The third most significant bit is applied to SW3. The least significant bit is applied to switch SWn. These switches and source 5 are connected to buffer amplifier 6. The output voltage of amplifier 6 is a function of the reciprocal of the binary input number.

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