SU1443144A1 - Shaper of square pulses from sine voltage - Google Patents

Abstract

The invention relates to a pulse technique and can be used, for example, in measuring, digital devices. The purpose of the invention — an increase in the basic stability at high frequencies — is achieved by maintaining a stable average value at the output of the TTL element and is provided by introducing a feedback circuit. single current. The shaper contains the first 1 and second 12 TTL elements, the transistor 7, capacitors and resistors shown in the drawing. The shaper can stably operate at frequencies from 100 to 150 MHz using a relatively low-frequency transistor as the transistor 7. The invention allows to increase phase stability at high frequencies. In this case, the limit for this series of TTL elements is realized. on ability. 1 il. i (L

Description

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The invention relates to a pulse technique and can be used, for example, in measuring, digital devices.

The purpose of the invention is to increase the phase stability at high frequencies by maintaining a stable average value at the output of the TTL element by introducing a direct current feedback circuit.

The drawing shows a diagram of a pre-jiarae Moro former.

The square pulse shaper of a sinusoidal voltage contains the first TTL element 1, the input of which is connected to the first output of the first resistor 2 and through the first capacitor 3 to the bus 4 of the sinusoidal signal source, the second capacitor 5, bus device, the second resistor 6, the first pin of which is connected to the base of the transistor 7, the third resistor 8, the first pin of which is connected to the common bus of the device, the fourth resistor 9, the first pin of which is connected to the bus 10 of the power source and, the output bus 11 of the device is the second TTL element 12, the input of which is connected to the output of the first TTL element 1, the output from the bus 11 of the output of the device and the second pin of the second resistor 6, the second output of which is connected to the second output of the third resistor 8, emitter the transistor 7 is connected to the common bus of the device, the collector is connected to the second terminal of the second capacitor 5, the second terminal of the first resistor 2 and the second terminal of the fourth resistor 9, with the first resistor 2 and the second capacitor 5 forming a phase-stabilizing CS circuit.

The shaper works as follows.

In the initial state, a divider voltage is applied to the base of transistor 7 by means of a divider on resistors 6 and 8. Transistor 7 together with TTL elements 1 and 12 and resistor mib, 8, 2 and 9 form a closed loop with negative feedback through voltage. Using resistor values 6 and 8, the output voltage of the TTL element 12 is set to a dc voltage level exceeding

threshold level of subsequent TTL devices (for example, +1.8 V). At the same time, the TTL elements 1 and 12 are in the linear mode, but this does not cause false failures of subsequent TTL devices for the indicated reason.

When a sinusoidal signal is applied to the device input, a pulse signal is generated at the output of the TTL element 12. Transistor 7, in conjunction with capacitor 5, works as an integrator, ensuring that the output TTL element 12 maintains an equivalent mean voltage of +1.8 V, regardless of the amplitude of the input sinusoidal signal. Providing the specified equivalent average voltage at the output of the TTL element 12 is equivalent to ensuring the specified duty cycle of the output signal of the TTL element 12. At the same time, the capacitor 5 shunts the second terminal of the resistor 2 at high frequency, which allows it to be used equal to sinusoidal signal (cable). This ensures good alignment of the driver with a sinusoidal signal source and contributes to increasing the stability of the device at high frequencies.

In addition, this allows a relatively low-frequency transistor to be used in the driver as a transistor 7, and the flow of the output current TTL j through the resistor 2 in the direction away from the valve ensures that the load current is sintered to the sinusoidal signal source, which also leads to increased stability pulse shaping.

The use of a square pulse shaper from a sinusoidal signal makes it possible to increase phase stability at high frequencies. In this case, the limiting load capacity for this series of TTL cells is realized.

Claims (1)

Invention Formula Square wave shaper from sinusoidal voltage, containing the first TTL element, the input of which is connected to the first terminal of the first resistor and through the first capacitor to the busbar of the sinusoidal signal source, the second end 1443144 The sensor, the first plate is identical with the output of the first TTL element, (Connected to the common bus formatir, output - with the output tin of the second resistor, the first output of which and the second output of the second transistor, the first output the third resistor, the first output is connected to the second output of the third one, connected to the common bus of the resistor, the emitter of the transistor, the fourth resistor, the first connected to the common bus, the formation of which is connected to the bus - with the second power supply source, distinguishing the second capacitor, the second power supply with the second capacitor; 7, in order to increase the first resistor and the second phase of the phase stability at the fourth resistor, and the second frequency; A biocapacitor and the first resonator of the TTL element are introduced into it, the input of which connects the phase stabilizing RC ten b.