SU1615864A1 - Sawtooth voltage generator - Google Patents

Abstract

The invention relates to a pulsed technique and can be used, for example, in creating sweepers. The purpose of the invention is to enhance the functionality by providing a constant level setting while maintaining the linearity of the output voltage. The generator is built on the basis of an operational amplifier 3, a current source 2, a bias source 7, a pulse driver 9. 3 il.

Description

01 00 About

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The invention relates to a pulse technique and can be used, for example, in the creation of sweepers.

The purpose of the invention is to enhance the functionality by providing a constant level setting while maintaining the linearity of the output voltage.

Figure 1 shows the structural electrical circuit of the generator; Fig. 2 shows diagrams explaining the operation of the circuit; FIG. 3 shows equivalent signal shaping schemes.

The sawtooth generator contains the first capacitor 1, the first plate of which is connected to the output of the current source 2, the inverting input of the operational amplifier 3, the first output of the first control switch 4, the second output of which is connected to the output of the operational amplifier 3, and the control input with a bus 5 inputs of the device, the second capacitor 6, the bias source 7, the first bus of which is connected to the common bus of the device, the non-inverting input of the operational amplifier 3 is connected to the common bus of the device, the second facing of the first The capacitor 1 is connected to the output bus 8 of the device, the pulse shaper 9, the second control switch 10 connected between the second bus of the bias source 7 and the second lining of the first capacitor 1, which is connected via the second capacitor 6 to the output of the operational amplifier 3, the control input of the second the control key 10 is connected to the output of the pulse former 9, the input of which is connected to the bus 5 of the device.

The generator works as follows.

At the time of the forward sweep stroke (when the keys 4 and 10 are open), a linearly varying voltage is formed on the series-switched capacitors 1 and 6 using a current source 2 and amplifier 3. Putting for simplicity of reasoning that the capacitance of the capacitor 6 is much greater than the capacity of the main integrating capacitor 1, and the voltage Ne was applied to the connection point of the elements during the reverse sweep, the outputs of the amplifier 3 and the sawtooth voltage generator (bus 8) will be the same sawtooth voltage, but with different initial levels (Fig. 2 a, b). At the time of arrival of the synchronizing pulse to the input of the sawtooth generator (Fig. 2c)

switches 4 and 10 are turned on and reverse sweep occurs. At this time, both capacitors (regardless of the current 1o) are set by the voltage Ee, which 5 is the starting point for the device to operate during the forward sweep stroke. Obviously, the value of voltage It does not affect the operation of the generator, and limits only the allowable voltage of capacitors.

0 Since capacitor 1 is connected to the output of current source 2, only its parameters determine the corresponding parameters of the sawtooth voltage. The parameters of the capacitor 6 on the accuracy

5, the generator does not have any effect. In this case, the sawtooth voltage is transmitted to the high voltage level by means of known amplifiers, for example, wide-ranging operation amplifiers without any additional high-voltage cascades.

During the forward stroke of the sweep, both keys are open and in sequence

5, the included capacitors 1 and 6 are connected between the inverting input and the output of the operational amplifier 3 (FIG. 3A). The change in output voltage according to the sawtooth law is determined by the current 1 ° and

0 by the capacitance of capacitor 1. In the presence of output current 1out, the output current of the operational amplifier will increase, but the pulse shape of the sawtooth generator will not change. Similarly

5, it is possible to show that there is no effect on the output parameters of the capacitor 6 capacitor drift, changes in which only lead to a change in the range and shape of the input voltage of the operational amplifier 3.

During the reverse sweep stroke (Fig. 3b), the key 10 connects the upper plates of the capacitors 1 and 6 to the bias source 7. Key 4 connects bottom plates

These 5 capacitors are interconnected and (when the non-inverting input of amplifier 3 is connected to a common bus) with zero potential. Thus, during the reverse sweep, both capacitors are charged before the voltage of the bias source (Fig. 3a) by non-grounded EMF generators connected in series with the capacitors.

Formula of invention

5 A sawtooth generator containing the first capacitor, the first plate of which is connected to the output of the current source, the inverting input of the operational amplifier, the first output of the controlled key, the second output of which

connected to the output of the operational amplifier, and the control input to the input bus of the generator, the second capacitor, the bias source, the first bus of which is connected to the common bus of the generator, the non-inverting input of the operational amplifier is connected to the common bus of the generator, the second plate of the first capacitor is connected to the output capacitor generator bus, characterized in that, in order to extend the functionality by providing a level setting

0

a constant component while maintaining the linearity of the output voltage, a pulse driver, a second control switch connected between the second bus of the bias source and the second plate of the first capacitor, which is connected through the second capacitor to the output of the operational amplifier, are inserted into it, while the control input of the second the controlled key is connected to the output of the pulse former, the input of which is connected to the input bus of the generator.

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Claims (1)

Claim A sawtooth generator containing a first capacitor, the first lining of which is connected to the output of the current source, the inverting input of the operational amplifier, the first output of a controlled key, the second output of which is connected to the output of the operational amplifier, and the control input to the input bus of the generator, the second capacitor, bias source the first bus of which is connected to the common bus of the generator, the non-inverting input of the operational amplifier is connected to the common bus of the generator, the second lining of the first capacitor and connected to the generator output bus, characterized in that, in order to expand the functionality by providing a constant component level while maintaining the output voltage linearity, a pulse shaper, a second controlled key connected between the second bias source bus and the second lining of the first capacitor, which is connected through the second capacitor to the output of the operational amplifier, while the control input of the second managed key is connected to the output A pulse input of which is connected to the input bus of the generator. FIG. 2