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Single to Double Ended Signal Conversion

IP.com Disclosure Number: IPCOM000090008D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR [+2]

Abstract

In certain applications where deflection is provided by operating the magnetic yoke in a push-pull configuration, it is desirable to generate deflection signals from a single ended signal source. A circuit for driving a push-pull deflection yoke from a single ended signal source operates as follows. The digital deflection signals are applied from a data source which can comprise a counter or register which is incremented or decremented in accordance with the desired deflection. This signal is decoded by digital-to-analog converter 13. The resultant analog signal on line 15 is applied directly to operational amplifier 17. Variable resistor 19 determines the gain of amplifier 17.

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Single to Double Ended Signal Conversion

In certain applications where deflection is provided by operating the magnetic yoke in a push-pull configuration, it is desirable to generate deflection signals from a single ended signal source. A circuit for driving a push-pull deflection yoke from a single ended signal source operates as follows. The digital deflection signals are applied from a data source which can comprise a counter or register which is incremented or decremented in accordance with the desired deflection. This signal is decoded by digital-to-analog converter 13. The resultant analog signal on line 15 is applied directly to operational amplifier 17. Variable resistor 19 determines the gain of amplifier 17.

The output of amplifier 17 is developed across resistor 25 and applied to amplifier 21 through resistor 32. Reference voltage -V1 is also applied through variable resistor 23 to bias operational amplifier 21, the closed loop gain of which is controlled by resistor 33. Assuming an increment of deflection is provided as a negative signal from deflection register 11, the decoded signal is amplified by amplifier 17, a voltage is developed across resistor 25, and the current flow through resistor 19 increases to balance the current from decoder 13.

Assuming perfect operational amplifiers 17 and 21, the current which flows into their output loads also flows through their associated yoke windings 27 and
29. In push-pull operation, the sum of the current ou...