SU687571A1 - Staircase voltage generator - Google Patents

Description

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The invention relates to electronics and can be used in various devices of computational technology, oscillography, and, in particular, as a generator of a symmetrical step-sawtooth voltage of an analog-to-digital converter readout raster

basis of the storage cathode ray tube.

A step-shaped signal generator is known in which a step-shaped signal is obtained by converting a pulse counting result on a n-bit binary counter into a voltage or current, overlaid from a separate circuit with a predetermined positive or negative offset.

To form upstream and downstream stepped signals, two digital-to-analog converters (ZAN) are used, connected to the direct and inverse outputs of the n-bit counter, respectively, and a switch connecting the outputs of the first or second DAC to the load, the switch is controlled by a trigger, counting

the input of which is connected to the output of the last digit of the pulse counter 1.

A disadvantage of the known generator is that the use of a two-channel D / A converter introduces additional instability in the formed signal, due to the non-identity of the DAC and the mutual drift of their parameters. In addition, the use of a switch in the analog part of the circuit also introduces instability in the formation of the output signal.

Also known is a step voltage generator containing a digital-to-analog converter, the inputs of which are connected to the outputs of a reversible counter, and a control trigger, which, depending on the code at the outputs of the reversible counter, enables the reversible counter 2 to operate.

The disadvantage of such a step voltage generator is the relatively low speed of the generator.

The purpose of the invention is to increase the speed of the generator.

For this, a step voltage generator containing a digital-analogue

the converter, the control trigger and the pulse counter are inputted to the switch, and the counter outputs are connected to the inputs of the switch, the outputs of which are connected to the inputs of the digital converter analog output of the high discharge counter are connected to the control trigger input, the output of which is connected to the control input of the switch.

The drawing shows a structural electrical circuit of a step voltage generator.

The step voltage generator contains a pulse counter 1, a control trigger 2, a switch 3 and a digital-to-analog converter 4.

The step voltage generator operates as follows.

The clocks entering the input of the n-bit counter 1 are converted by the counter 1 to the forward and reverse codes of the number of incoming pulses. Switch 3, depending on the state of trigger 2 of control, connects to the digital-to-analog converter 4 forward (inverse) outputs of counter 1. At the output of the digital-to-analog converter, an upward (downward) branch of the step-shaped signal is formed. When the output of the pth discharge of the counter 1 pulse appears, the control trigger 2 switches over the state of the switch 3. The switch 3 connects the inverse (direct) outputs of the counter 1 to the digital-to-analogue converter 4. The output of the digital-to-analogue converter 4 is formed accordingly. the step (rising) branch of the stepped form.

Claims (2)

1. Japanese Patent No. 47-7407, cl. H 03 K 4/02, 02.03.72. 2.Analog-Digital Conversion Handbook. Norwood, USA, Analog Device Inc, 1972, p. 1-69 (prototype). / V / k V k / Bwd Z