SU681441A1 - Apparatus for forming scanning voltage - Google Patents

Description

I

The invention relates to automation and computing and can be used in radio engineering systems, in particular information display devices with digital control of a beam of electron-beam tubes.

A digital-to-analog device is known to form a linear-and-name of its own ij voltage.

This device is not high enough accuracy.

The closest to the proposed solution to the technical solution is an analog-to-magnetic generator of a magnetic inverter, whose analog-to-digital converter (DAC) contains two converters — analogue code 2.

This device has a lack of high accuracy, and in fact, high-speed code converters in it — an analogue — complicates the design of the device.

The aim of the invention is to improve the accuracy and simplification of the device.

For this, the proposed device contains an EL GENT block AND-OR, a second counter, a third counter, a delay element, an OR element and a switch, so that the register output is connected to the first input of the AND-OR block, the output of the first counter is connected to the second input of the elec- talent block, the output of the I-OR teller unit is connected to the input of the second counter and the delay input, the output of the second counter is connected to the first input of the OR element, the output of the delayed element is connected to the input of the third) counter, the output of which is connected to the second input of the IL element And, the output of the element OR is connected to a switch, the output of which is connected to the input of a yukalogalog converter.

The drawing shows a block diagram of the proposed device.

Claims (2)

The device contains a register 1, the first counter 2, the block of elements AND-OR 3 second counter 4, the delay element 5, the third counter 6, the element OR 7, the switch 8 and digital-to-threshold converter 9. The device works as follows. The input of the register 1 post 11 binary control code. To the input of the first counter 2 incremental pulses, pulses are received with a control frequency. From the output of the register, the code goes to one input of a block of AND-OR 3 elements, to another input of which signals are sent from the first counter 2. The output of the block of AND-OR elements forms a frequency flow of impulses, the number of which is proportional to the value of the received code. The flow of pulses is recorded in the second counter 4 of the control of the digital-to-analog converter (D / A) and, via delay element 5, into the third counter 6 at the D / A converter. The direct and inverse outputs of each bit of counters 4 and 6 are connected to the element OR 7 and through the switch 8 of the direct and inverted codes are connected to the input of each bit of the DAC 9. As a result of this switching on the DAC control circuits, each subsequent bit of the DAC turns on the corresponding bit of the main counter, and each previous bit is turned off from the corresponding bit of the third counter 6. The time between switching on the next bit and turning on the previous bit is determined by the delay element 5 and is selected to eliminating emissions at a linearly varying output voltage of the DAC. The invention makes it possible to increase the accuracy of the voltage sweep, which reduces the measurement error due to an eel. Simplification of the circuit is achieved by using an additional DAC control counter instead of an additional analogue code converter and control circuits to it. Claims An inventive voltage generating device comprising a register, a first counter, a digital-to-analog conversion. In order to improve the accuracy and simplify the device, it contains an AND-OR element block, a second counter, a third counter, a delay element, an OR element and a switch, the register output being connected to the first input of the AND-OR block block, the output of the first counter is connected to the second "1 input of the block of AND-OR elements, the output of the block of elements AND-OR is connected to the input of the second counter and the input of the delay element, the output of the second counter is connected to the first input of the OR element, the output of the delay element is connected to the input of the third Meters withstand whose output is connected to the second input of the OR gate, an output of OR connected to the switch, whose output is connected to the input of the digital to analog converter. Sources of information taken into account in the examination 1. UK Patent No. 1162289, cl. H 4 T, publ. 1069. 2.Berman V. R., Frolkin V. T. Gene © Magnetic sweep devices for electron-beam indicators, p. 231-233, 1976.