SU493006A1 - Relaxation oscillator - Google Patents

Description

one

The invention relates to a pulse technique and can be used in devices of discrete automatics and computing technology as a pulsed phase-phase master oscillator of a stable frequency.

A well-known relaxation oscillator is made according to the scheme of a multivibrator with capacitor recharging, containing two transistors connected according to the zero-organ circuit with two times, defining posts and two key transistors.

The purpose of the invention is to improve the stability of the repetition frequency and the expansion of the frequency range.

To do this, in the proposed device, a quartz resonator is included between the bases of the transistors of the key stages.

The drawing shows a schematic diagram of the proposed device.

The oscillator of relaxation oscillations with, wins the transistors 1 and 2, connected according to the scheme of zero-organs; key transistors 3 and 4, resistors 5-14, capacitor i 15 and a crystal oscillator 16.

The generator works as follows

Let transistors 2 and 4 open, and transistors 1 and 3 closed. The voltages at the wig points are close to zero, and the voltages at points a and b are to (J, set by the divider of resistors 5 and 6). The capacitor 15, charged for the previous cycle of operation, before the voltage U. until the supply voltage E. Capacitor overcharging stops when the voltage across the bridge diagonal is equal, and then transistors 1 and 3 open like an avalanche-like pattern. Another pair of transistors 2 and 4 is closed at this moment. 6, 10, capacitor 15 and resonator 16) and start It is recharged through a resistor 10. When the balance of the left bridge is reversed, the circuit reverses and the process repeats. Quartz resonator 16 performs the functions of a synchronizing current source.

The proposed scheme operates in the frequency range from 1 to 60 PAHs with frequency instability, while the known relaxation oscillator circuits with quartz stabilization have a maximum generation frequency of up to 10 MHz s

---. . ; d; --- g

unstable asthma 10; ...--. J

With the proposed switching circuit of a quartz resonator, the power dissipated at the resonator is reduced, as the excitation voltage is removed from resistors 9 and 11 and is limited in magnitude at the level of the direct voltage on the base-emitter junction of transistors 3 and 4. reason-

torus 16, increases the frequency stability of the generator.

Claims (1)

Invention Formula A generator of relaxation oscillations made according to the scheme of a multivibrator with capacitor capacitor overload I, containing two; a transistor connected according to the scheme of nullorgans with duma time defining waves and two key transistors, characterized in that, in order to improve the stability of the repetition frequency and expansion of the frequency range, a quartz resonator is connected between the bases I of the transistors of the key stages Bbiwdl 0 dbiwdE HZf