SU418970A1 - THRESHOLD DEVICE - Google Patents

Description

The invention RISES to the pulsed ones. and can be used in high performance, high-sensitivity radio-electronic circuits. A threshold device is known; of the avalanche transistor, the choice of the operating point “on the volt-mall characteristics of a lavi“ transistor. The lack of known threshold devices on avalanche transistors is relatively low sensitive At a speed of ten MHz, it is 50-100 mV. The desire to increase the sensitivity of the threshold device by shifting the working TOC to the maximum voltage of the avalanche trap characteristics makes it extremely unstable. the invention — an increase in the sensitivity and stability of the device — is achieved by introducing delay lines into it, between the output of the signal source and the avalanche transistor, and the current generator connected between the output input collector and regular enrollment th transistor through a resistor. The drawing shows a diagram of the proposed device. Device Includes Lavium T RISistor. The base of the avalanche transistor is connected through a resistor 2 to the source of the bias voltage Ee and through the delay line 3 to the source 4 of the input signal. A load resistor 5 is connected to the avalanche transistor / collector through a storage capacitor 6 and a power supply voltage supply plt via a resistor 7. The output of the input sypnal source 4 and the avalanche transistor collector / are connected via a series-connected current generator 8 and resistor 9. In the initial state through resistors 7 and 9. current flows through the current generator 8. The magnitude of the current is set so that the potential of the collector at a given bias voltage in the base is lower than the breakdown voltage by a certain quantity. This value is chosen such as to provide a reliable reserve but a stable device. An input signal from the output of the input source 4 closes the current generator 8, which leads to an increase in collector loss by the duration of the input signal. The rate of increase in the collector potential is determined by the charge rate of the solder capacitor. The established value of the collector potential BbiowpaeiiCH is such that the magnitude of the voltage on the collector is close to; when the sample voltage is selected, see selected. The delay should be longer than the time required for voltage to be applied to the collector. Input sipnal increases the potential of the avalanche transistor base. Taking into account the fact that the operating point of the tramistor is previously brought to the maximum of the current-voltage characteristic, the breakdown of the fault; the stator occurs at a lower threshold value than in the absence of collector control.

Resistor 9 eliminates the effect of output

generator capacity

current on raoot avalanche transistor.

Subject matter

The threshold device, on the avalanche transistor, is switched on according to the scheme with a common emitter, maintained, its input source, connected1 | w to the base of the transistor, the cumulative Coadden sator included in the collector circuit of the transistor, and the load, characterized in that, in order to increase the sensitivity and stability of the device,

connected between the output of the signal source and the base of the avalanche transistor, and a current generator connected between the output of the signal source and the number of the vector of the transistor through a resistor.

-L E,

st; 9g