SU1354129A1 - Device for forming complex harmonic signal with predetermined harmonic factor - Google Patents

Abstract

The invention can be used to calibrate nonlinear distortion meters and serves to enhance the functionality of the device. The device contains a generator of 1 sinusoidal signals, a comparator of 2 voltages, an amplifier-limiter 3, an integrator 4, an amplifier 5, an adjustable element 6, an attenuator 7 and an adder 8. Introducing the average value converter 9, an attenuator 10 and an adder 11 allows for additional outputs devices of intermediate signals of rectangular, triangular and sawtooth forms with varying values of harmonic coefficients depending on the duty cycle. In addition, the device has a deterministic harmonic spectrum of the generated signal. 1 il. with S (L coned 4 th co

Description

The invention relates to a radio measuring technique and can be used for calibrating nonlinear distortion meters.

The purpose of the invention is to expand the functionality.

The drawing shows a block diagram of the device.

The device contains series-connected sinusoidal signal generator 1 (GSS), voltage comparator 2, series-limiting amplifier 3, integrator 4, amplifier 5, adjusting my element 6, attenuator 7 and adder 8, as well as serially connected average converter 9 , attenuator 10 and adder 11, the second input of which is combined with the input of the comparator 2 voltage, the second input of the adder 8 and the input of the converter 9 average values, and the output is connected to the input of the amplifier-limiter 3. The output to The omparator 2 is connected to the control input of the adjustable element 6, the output of which is connected to the second input of the voltage comparator 2. The output of the adder 8 serves as the first output of the device. The control input of amplifier 5, which is the second output of the device, is connected to the input of integrator 4, the output of which is the third output, and the output of amplifier 5 is the fourth output of the device.

The device works as follows.

A sinusoidal signal with a small harmonic value from the output of the GSS 1 is supplied to the second input of the adder 11 and to the input of the average converter 9, where it is converted into a constant voltage proportional to the amplitude of the sinusoidal signal, which through the attenuator 10 is fed to the first input of the adder 11. On The output of the adder 11 generates a sinusoidal signal with a constant offset from the zero level. This signal is fed to the input of the limiting amplifier 3 with an open input, the output of which forms a square-shaped signal with a duty cycle depending on the level of the constant bias at the output of the adder 11, i.e. from the coefficient of transmission K-a attenuator 10. When you change K .., changes the duty cycle Q sig

ten

Square rectangular: Q F (K,).

 The square wave signal is fed to the second output of the device. The decomposition of this signal into the Fourier trigonometric series, depending on the duty cycle, is as follows:

I (i

Bp

, -ir-n sin --- "

h cos n with t),

0 5 0

N Uo3, where n is the number of the harmonic component;

the number of harmonic components taken into account; the amplitude of the signal U. From the output of the amplifier-limiter 3, the signal arrives at the input of the integrator 4, at the output of which a triangular signal is formed with different durations of the ascending and descending sections. This signal is applied to the third output of the device and has a decomposition in the Fourier series, depending on the duty cycle of the original signal: N

five

4 Uc, 4., 1. --T-T1 (-n7

XCOS n cot),

 ll-n

-Q-

where UQ is the amplitude of the U signal.

40 After passing through the amplifier 5, the triangular signal is converted into a sawtooth signal with a doubled, compared with the frequency of the original sinusoidal signal,

45 frequency. Its decomposition in rd Fourier is as follows:

and, 2 Uo5Zl - "2 nutj,

at Q

where and

05

2,

- amplitude of signal U

at

The output signal of amplifier 5 is supplied to the quarter output of the device and is also used as a signal of higher harmonics, which is equalized by the root-mean-square value with the original sinusoidal sig-1354

with a comparator 2 voltage and an adjustable element 6.

The required value of the harmonic coefficient at Q 2 at the output of the device is set using an attenuator 7, and the normalized signal of higher harmonics is summed with the first harmonic in the adder 8.

 The device has a deterministic spectrum of the harmonic components of the signal being formed and enhanced functionality due to supplying additional outputs of the device with intermediate signals of rectangular, triangular and sawtooth forms with varying values of the harmonic coefficients depending on the duty ratio.

Claims (1)

Invention Formula A device for generating a complex harmonic signal with a predetermined harmonic coefficient, containing a series-connected sinusoidal signal generator, a computer Editor A.Vorovich Compiled by N.Fyodorov Tehred L. Oliynyk Order 5689/40 Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. D.4 / 5 , Production and printing company, Uzhgorod, Projecto st., 4 0 g five 0 1294 voltage isolator, a series-connected limiting amplifier, an integrator, an amplifier, an adjustable element, an attenuator and an adder, the output of which is the device output, the output of the amplifier-limiting amplifier connected to the control input of the amplifier, the input of the voltage comparator connected to the second input of the adder, its second input is to the attenuator input, and the output is to the control input of the adjustable element, which is due to the fact that, in order to expand its functionality, serially connected the average converter, the second attenuator and the second adder, the output of which is connected to the input of the limiter amplifier, and the second input are combined with the input of the voltage comparator and the input of the average converter, the control input of the amplifier, the output of the integrator and the input of the adjustable element are respectively the second , the third and fourth outputs of the device. Proofreader S. Shekmar