SU1347041A1 - Method of determining static characteristic of non-linear element of electronic devices - Google Patents

Abstract

This invention relates to a measurement technique. The method is implemented by a device containing a signal generator 1 (C) $ (t), an adjustable generator 2, which forms a periodic C (t) f; (t / 2), ..., $ (t / n), a non-linear charge (E) 3, linear E 4, selective filter 5, voltmeter 6, phase meter 7. To the nonlinear E 3 input, C (t), (t / 2), ..., ..., (t / n) with a period T are successively served, 2T, ..., pT, containing areas with a monotonic dependence of an arbitrary shape. From the output selector C, the frequency of the first harmonic is selectively separated at each successive influence of periodic C, the first-harmonic tits and phase shifts relative to the first harmonic of the input C (t) with a period T are measured and the static characteristic of the non-linear E 3 is determined by mathematical expression, described in the specification. 1 il. in (L 00 4

Description

This invention relates to a measurement technique and can be used to measure static characteristics, electronic devices, g

The purpose of the invention is to provide a determination of the static characteristic of electronic devices made in the form of serially connected nonlinear and linear elements 10 with an unknown transfer function and a priori given coordinates of the measured static characteristic of a nonlinear element at its two points.

The drawing shows a device that implements the proposed method.

The device contains a signal generator 1 (t), the output of which is co ..., n, a harmonic appears at the output of the linear element at frequency F

(Ap-sin (2llFt +), where A is the amplitude characteristic of the linear element, and ф is the phase characteristic of the linear element at the frequency F.

Due to the arbitrary choice of the beginning of the report, the phase of the main harmonic

 (t) we consider zero, W 0. The value of f can be defined as the phase shift between the first harmonic of the input signal (t) and the harmonic of the frequency F at the output of the linear element, since the nonlinear element at the first harmonic of the periodic signal with the input of the controlled generation 20 adds phase

torus 2 forming successive shifts,. periodic signals (t), $ (t / 2), .Thus, with a succession of atele .. ,, (t / n), nonlinear element 3, the input to the input of a nonlinear

the output of which through a linear element of the signal element (t), 4 (b, ment 4 is connected to the input of a selective 25

filter 5, the output of the latter is connected.,., t (-) at the output of the linear element to the input of the voltmeter 6 and to the input of the phase

meter 7, the reference input of which is connected to the output of the generator I,

The method is carried out in a conspicuous manner.

Signals $ (t), $ (t / 2) ,,,, (t / n) with period T, 2Т ,,,. ПТ, Signal (t) contains a monotonic region with increasing or decreasing dependence of x (t) of the form x (t) (t + QD), where ttt (t, t T).

For a monotone function x (t), there always exists the inverse function

P

This measures the amplitudes, harmonics of the frequency F, and their phase shifts, 30 relative to the fundamental harmonic.

signal (t). These values are respectively equal

35

F

AF A /

Q,

V

F

The obtained results determine the function (t) l in the form

t (x).

The range of x (t) should be such as to cover the entire range of input signals of the nonlinear element.

If we denote the desired characteristic of a nonlinear element by Y (x), when a signal x (t) is applied to its input, a signal Yt (t) is obtained, which can be represented as a Fourier series

, , t , „. 55 some characteristic Y (x), which Yff; (t) 0, k,), p is related to the desired Y (x) dependently (H - J

When applying to the input of a nonlinear element signals (-), where, 2 ,,,,

..., p, a harmonic appears at the output of the linear element at frequency F

(Ap-sin (2llFt +), where A is the amplitude characteristic of the linear element, and ф is the phase characteristic of the linear element at the frequency F.

Due to the arbitrary choice of the beginning of the report, the phase of the main harmonic

 (t) is assumed to be zero, W 0. The value of f can be defined as the phase shift between the first harmonic of the input.,., t (-) at the output of the linear element

P

This made measurements of the amplitudes, harmonics of the frequency F and their phase shifts relative to the main harmonic

signal (t). These values are respectively equal

F

AF A /

Q,

V

F

The obtained results determine the function (t) l in the form

YL (t) sin (2TlFKt + V4,)

45

K-1

  (t) -Qa,

(ABOUT

where a ar-q | , I, 2 ,,,,, p;

H +, (K, H) If in expression (1) at t, t t to replace t (x), get

view

Y (x) YCx) -a

or after transforming Y (x) K, Y (x) + QO,

.

The desired characteristic Y (x) is determined with an accuracy of up to two constant K and Od. These constants are located along two a priori known coordinates of the desired characteristic.

Y Y (x,); Y Y (x)

by solving a linear equation system

t

Y, Kp- Y (x,) + a ,; Y K, - Y (x).

Claims (1)

Invention Formula The method for determining the static characteristic of a non-linear element of an electronic device, based on applying a test signal to the device to be injected, isolating the harmonic components from the output signal of the device, measuring their amplitudes and determining the static characteristic using a mathematical expression, which in order to determine the static characteristics of electronic devices, made in the form of serially connected nonlinear and linear elements with unknown the transfer characteristic and a priori given values of the coordinates of the measured static characteristic of the nonlinear element at its two points; a periodic signal is sent to the input of the device under investigation $ (t), C) (-) with periods Compiled by L. Muranov Editor I. Gorna Tehred I. Popovich Corrector L. Pilipenko Order 5117/44 Circulation 729 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, 4. T, 2m, .. ,, Fri respectively, the contents of -. monotonous dependence of arbitrary shape, from the output signal of the device selectively out. one the frequency of the first harmonic is divided at each successive exposure of the specified periodic signals to the device, the amplitudes A, A, ..., A of the first harmonics and their phase shifts f, V, ..., H are measured respectively relative to the first harmonic of the input signal ( t) with period T and determine the static characteristic Y (x) according to the mathematical expression Y (x) KTZA sin 2aK-F5 (x) +  -H, +, where (x) is the inverse function of mono-. tone section signal (t); K, (Y, -Y,) / ld sin 2 KF $ - (x,) + + C -M, -sin 2vHKF (x,) + + 41-Ф, - transfer characteristic of a linear element; a „Y -К, 1 ± А sint2l KF -Чх;) , + wf constant static 1 which characteristics; (Y ,, hL and (Y, X) are a priori given coordinates from the static characteristic Y (x).