SU369679A1 - GENERATOR RECTANGULAR PULSES - Google Patents

Description

one

The invention relates to a pulse technique and is intended to generate rectangular pulses of stable frequency and duty cycle.

A known square-wave pulse generator contains a time master / C-bridge, an integral semiconductor operational amplifier, the differential inputs of which are connected to the output diagonal time of the master / C-bridge, and the output of the amplifier is connected to the input diagonal of the said bridge.

However, such a generator has a low stability of the output pulse porosity and does not provide a soft self-excitation mode.

In order to increase the stability of the output pulse porosity and to ensure a soft self-excitation mode in the proposed generator, a parallel RC chain is connected between the output of the operational amplifier and the input diagonal of the driving RC-MOCTa time.

FIG. 1 and 2 shows variants of the schemes of the proposed generator; “And FIG. 3 and 4 are the voltage plots at the input of the op amp.

The generator contains the time setting RC capacitance 1, one arm of which consists of capacitor 2 and resistors 3 and 4, and the other from resistors 1) and 6. The voltage from the output of bridge 1 is fed to the differential inputs 7 and 8 of the integrated semiconductor operational amplifier 9. Between the output of amplifier 9 and the input diagonal of the bridge / is connected parallel to the C-chain, consisting of a capacitor 10 and a resistor 11. The voltage jump from the output of the operating

amplifier 9 enters the diagonal of the bridge. The voltage on the capacitor 10 does not change abruptly, so a jump appears at the input 7 of amplifier 9, determined by the transfer ratio of the divider consisting of capacitor 2 and resistors 3 and 4. At the input 8 there appears a jump determined by the transfer ratio a divider consisting of resistors 5 and 6. The transmission coefficient of the first divider is larger than the transmission coefficient of the second divider, therefore the voltage at input 7 at the beginning of the pulse is greater than the voltage at input 8.

As recharge yes capacitor 10 ex

the input input 7 of amplifier 9 decreases

exponentially, but at the output of the operational amplifier 9

unchanged since this amplifier is

in a saturated state. At the moment when the voltages at the inputs 7 and S are equal, the amplifier 9 leaves the saturation region and the output voltage begins to monitor the input. A decrease in voltage at input 7 relative to input 8 of amplifier 9 causes a decrease in output voltage, and therefore a further decrease in voltage at input 7, i.e., a positive feedback circuit closes, and the generator circuit jumps to the opposite state.

FIG. 2 shows a generator circuit in which the C-bridge is somewhat modified: there is no capacitor 2 in the nerve arm, and in the second leg, instead of resistor 6, capacitor 12 is turned on.

The scheme works in a similar way.

Subject invention

A square pulse generator containing a time driver / C-bridge, an integrated semiconductor operational amplifier, the differential inputs of which are connected to the output diagonal time of the driver J C-MocTa, and the output of the amplifier connected to the input diagonal of the said bridge, characterized in that to increase the stability of the output pulse and the mode of self-excitation of the generator, between the output of the operational amplifier and the input diagonal, the time of the master C-bridge is connected to a parallel 7 C-chain ka

, Output V ikimdAZ / V

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