SU1498242A1 - Spectrometric amplifier - Google Patents

Description

(46) 07.01.91. Bul № 1

(21) 4053293/25

(22) 04/08/86

(72) N.F. Borisov, B.S. Vshpnkov and S. A. Gutov

(33) 539. 1.075 (088.8)

(56) Meleshko, EL, Integrated Circuits in Nanosecond Nuclear Electronics. Ltomizdat, 1978, p. 52.

The Review of Sientific Instruments. 35, V 2, 19fi4, c. 151. (54) SPECTROMETRIC UCH USSHSTSL

(57) The invention relates to the field of nuclear electronics and can be used in current screen amplifiers with ionizing radiation detectors. The purpose of the invention is to improve the reliability of the amplifier and bandwidth expansion. The power consists of three series-connected transistors, the first two of which

included under the scheme with general bachy and

have 11ROTIVP11OLO) PI.M.CHRNOST,

The third transistor is connected via cxrt-ie with a common emitter and has the same polarity as the first transistor. in the circuit of the co.plektora of the third D) two resistors of the negative odjiaTHOi i sv i. the first and which are connected to the emitter of the second transis-tg) rt, the second H - to the power source, the circuit emitter of the first-transistor and the emitter of the third transistor include the current transistor, 11p1than matching the input and output voltages of the cascades it is necessary to select the values of the first two current resistors. Above the switching order of the transistors allows easy matching of the stages in the amplifier. 1 il.

cl

The invention relates to nuclear electronics and can be used in ionizing radiation detection channels.

The purpose of the invention is to increase the reliability of the amplifier and the expansion of the bandwidth.

In the drawing, preampled circuit amplifier.

It contains dpa cascade I, 2 current amplifiers. Each cascade consists of an additional transistor 3, the first and second transistors 4 and 5, the first, the third and the third resistor 6-8, the first 9 and the second 10 negative resistors

feedback. An amplifier stage circuit consisting of first and second transistors 4 and 5 and negative feedback resistors 9 and Yu is called a pair of Pai ia.

The circuit mode for current is as follows. The value of the first current-setting resistor 6 is chosen so that the emitter-to-base transition of the additional transistor 3 has a small input resistance (6-7 Ohms) and the voltage at the emitter is about 0.7 V. MToOf.r to get the same voltage at the upstream of the amplifier cascade as well as at the input, it is necessary to select the corresponding value of the second current of the second question

00

to

ai

to

7, it is thus possible, without any matching elements, to carry out the series connection of the amplifier stages into the amplifier, this is achieved by switching on. neither an additional transistor 3 is of the same polarity as the second transistor 5, and the corresponding circuit setting. In addition, an additional 10 tanks in each cascade of the amplifier

The transistor 3 reduces the influence of the wiring capacitor and connecting cables when assembling the amplifier from several stages.

The amplifier operates as follows: ob-15 through the first current-carrying resistor to

plus power source, base doeom.

When a detector (for example, an ionization chamber) Kotonbrfi is triggered, it uses a current source, a current pulse, goes to the first amplifier stage and repeats with an additional transistor 3 connected in a common base circuit, then it goes to the Rash amplifier, which amplifies the current. The amplified current pulse from the emitter of the transistor 5 enters the next cascade of the accelerator.

Claims (1)

Invention Formula A spectrometric amplifier, comprising cascades of current amplifiers, each of which consists of the following 20 25 The additional transistor is connected to a common point, the auxiliary transistor collector is connected to the emitter of the first transistor, the base of the first transistor is connected to the common point, and the collector of the first transistor is connected to the second current setting resistor and the base of the second transistor, the collector of the second transistor is through the first negative feedback resistor connected to the emitter of the first transistor and through the second resistor of the negative feedback to the minus of the power source, and the emitter of the second transis ora is connected via a third resistor to the positive voltage driving power source. connected transistors of different conductivity, three current mode resistors and two negative feedback resistors, characterized in that, in order to improve the accuracy of the amplifier and bandwidth expansion by connecting cascades without An additional transistor with the same conductivity as the output transistor of the cascade is introduced, with the emitter of the additional transistor connected The additional transistor is connected to a common point, the auxiliary transistor collector is connected to the emitter of the first transistor, the base of the first transistor is connected to the common point, and the collector of the first transistor is connected to the second current setting resistor and the base of the second transistor, the collector of the second transistor is through the first negative feedback resistor connected to the emitter of the first transistor and through the second resistor of the negative feedback to the minus of the power source, and the emitter of the second transistor Ora is connected via the third current-generating resistor to the positive power source. Out8