SU1472852A1 - Method of determining integral non-linearity of pulse amplifiers - Google Patents

Abstract

This invention relates to the control of electronic products, in particular, pulse amplifiers. The purpose of the invention is to improve the measurement accuracy. The method is implemented in a device comprising a generator of 1 stable amplitude pulses. The pulses through the attenuator 2 are fed to the input of the tested amplifier 3, the output of which is connected through a switch 4 to the analyzer of 5 pulses, which carries out amplitude analysis. The key 4 is controlled by the signal of the control unit 7, which also receives information about the input pulses. Output unit 6 provides the output of the amplitude analysis result, which provides control of the parameters of the tested amplifier 3. 2 Il.

Description

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The invention relates to electronic technology and can be used to determine the metrological parameters of pulse amplifiers, in particular, to determine the integral nonlinearity of spectrometric linear amplifiers for semiconductor detectors of ionizing radiation.

The purpose of the invention is to improve the measurement accuracy.

The essence of the method is to set the amplitude of the pulses of the reference pulsed signal source connected to the input of the device under test equal to the maximum linear range of the output signals of the amplifier, attenuate the output signal of the pulsed signal source with an attenuation factor equal to the gain of the test amplifier .

Collect alternately, with a period shorter than the average instability time of the measuring path, in this case the reference pulsed signal source and the amplitude analyzer, the spectra of the output pulses of the amplifier and the reference pulse source of signals by successively setting the amplitude of the output pulses of the reference pulse source of signals. According to the data obtained, the centers of the t of sticks of the peaks of the amplitude distributions of the measuring path are included in the composition of the reference source of pulsed signals, the amplifier and the amplitude analyzer relative to the centers of gravity of the peaks of the amplitude distributions of the measuring path within the reference source of pulse signals and the amplitude analyzer.

The dependence is approximated by the least squares method of the point of the constructed characteristic, and the integral nonlinearity of the tested pulse amplifier is determined from the obtained dependence.

FIG. 1 is a block diagram of the device explaining the essence of the method; FIG. 2a shows the spectrum observed on the screen of the amplitude analyzer when measuring; Figure 2b shows the characteristics of the dependence of the measured centers of gravity of the peaks of the amplitude distributions of the measuring path comprising: a reference source of pulse signals, an amplifier and an amplitude analyzer relative to the centers of gravity of the peak of the amplitude distributions of the reference source of pulsed signals and an amplitude analyzer.

The device contains a generator of 1 stable amplitude pulses, the output of which is connected to an attenuator 2, the output of which is connected to the input of the test amplifier 3, the output of which is connected to the second input of key 4, the output of generator 1 is connected to the first input of key 4, the output of which is connected to the input the amplitude analyzer 5 pulses, the output of which is connected to the output unit 6, the third control input of the key 4 is connected to the output of the control unit 7, the input of which is connected to the input of the synchronization signal of the generator 1.

The method is implemented as follows.

The amplitude of a stable amplitude pulse generator 1 is set equal to the maximum linear range of the output signals of amplifier 3. Signals from a stable amplitude pulse generator 1 output to the attenuator 2 and the first key input 4. After attenuation with an attenuation factor equal to the gain of the amplifier 3 under study, the signal from attenuator 2 is fed to the input of amplifier 3, from the output of which the amplified signal is fed to the second input of key 4, to the third control input of key 4 receives a control signal Scanning from the control unit 7, whose input is controlled by the output signal of a stable amplitude pulse generator 1 / Key 4 is connected to the input of a multichannel amplitude analyzer 5 pulse, stable pulse amplitude generator 1 and output pulse of the investigated amplifier 3 with a period scan no more than 10 s, at each value of the amplitude of the output amplitudes of the pulses. The set time is determined by the pulse frequency of the generator 1 of stable amplitude pulses. After processing in a multichannel analyzer 5, the total spectrum (Fig. 2o) for subsequent processing is output through output unit 6, including

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a digital printing device. Further, according to the measurement results, the positions of the center of gravity of the maximum of the amplitude distributions peaks are found according to any known relation. Using the software of modern amplitude analyzers, the positions of the center of gravity of the peaks of the amplitude distributions are determined automatically by a known program.

Build the dependence of the positions of the centers of the tin of the peaks of the amplitude distributions of the measuring path in the composition of: a generator 1 of pulses of stable amplitude, the investigated amplifier 3 and the amplitude analyzer 5 relative to the positions of the centers of the tin of the peak of the amplitude distributions of the measuring tract; generator 1 pulses of stable amplitude and amplitude analyzer 5 (Fig. 2 /). The approximation using the least squares method of the point constructed, the characteristics, determines the integral nonlinearity of the amplifier.

The error of the proposed method is determined by the width of the analyzer channel and the accuracy of determining the center of gravity of the peaks of the amplitude distributions. With a channel width of 1.25 mV and accuracy in determining the center of gravity of the peaks of the amplitude distributions equal to 0.1 channel, the method error does not exceed 0.002%.

Claims (1)

Invention Formula The method for determining the integral nonlinearity of pulse amplifiers, five consisting in forming a pulse sequence with an amplitude equal to the maximum value of the linear range of the output signals of the tested pulse amplifier, attenuating the amplitude of the pulse sequence with an attenuation factor equal to the amplification factor of the tested pulse amplifier, serves as a pulse sequence with a weakened amplitude to the input the test pulse amplifier; the amplitude of the output signals of the test pulse amplifier is measured; The amplitudes of the pulse sequences are reduced and the amplitude of the output signal is repeated, and the dependence is constructed. information parameter, the dependences determine the integral nonlinearity of the tested pulse amplifier, different 0 five in order to increase accuracy. 0 five register the amplitude distributions for the pulse sequences supplied to the input of the tested pulse amplifier and the corresponding output signals of the tested pulse amplifier, plot the center of gravity of the amplitude distributions of the output signals of the peaks of the test pulse amplifier of the center of the peak of the peak of the corresponding amplitude distributions of the pulse sequence and take it as dependencies informative parameter. Channel 8 score Number, $. kana / iaoi v, " rf, | 6f J Y5 f in four four four four " # / g% # +%% #. . IG    nd THEM