SU1241409A1 - Two-phase harmonic signal generator - Google Patents

Abstract

The invention relates to electronics. Regulation of the magnitude of the phase shift between the output harmonic signals, the input control signal presented in the I-bit code is provided. The device contains a multivibrator 1, a pulse distributor 2, two sets of keys 3, 4, two LPF 5, 6, a source of multi-level constant voltage 7, a block of switches (BC) 8. BC 8 is made on logical switches of signals that provides speed and does not introduce a delay during the established phase shift between the output harmonic signals. Control of BC 8 is carried out by a unitary code, which is then converted to binary. BC 8 operates in accordance with the table of truth. 2 ill., 1 tab. (L o; o

Description

The invention relates to radio electronics and can be used in radio engineering in quadrature signal processing, in measurement technology and metrology in the construction, calibration and calibration of electronic devices.

The purpose of the invention is to provide control of the magnitude of the phase shift between the output harmonic signals, the input control signal represented in the p-bit code.

FIG. Figure 1 shows the structure, on the electrical circuit of a two-phase harmonic signal generator; in fig. 2 - switch block.

The two-phase harmonic signal generator contains a multivibrator 1, a pulse distributor 2, the first and second blocks 3 and 4 of the keys, the first and second low-pass filters 5 and 6, the source 7 of multi-level DC voltages and the switch block 8.

A two-phase harmonic generator, the signal operates as follows.

The pulses from the output of the multivibrator 1 are fed to the input of the distributor 2 pulses and appear successively in time at each of its n outputs. The inputs to the similar p-signal inputs of the first block of 3 keys will form a stepwise voltage U-i from the source 7 of multi-level DC voltages, which will be smoothed by the first low-pass filter 5 (LPF) to the required non-linear distortion coefficient. As a result, at the output of the first low-pass filter 5, a harmonic signal U A SinuJt appears, where A is the amplitude, and i is the circular frequency.

Simultaneously, the pulses from the distributor 2 pulses arrive at the n-input inputs of the switch unit 8. Their appearance on the first, second, ..., nth outputs of this block 8 depends on the code received on the control inputs of the block 8, for example, from the computer. So, for example, if on all n control inputs logical O, then the digital signal from the first input of block 8 is connected to the first output, from the second entrance to the second output, etc. Then the second block. 4 keys will work, like the first block of 3 keys. Therefore, at the output of the second PCF 6,

“;

ten

lii

Where

241409..

Wits harmonic signal Og, coinciding in phase with .and / f, i.e. 0

If on the first control input of the unit 8, logical 1 is turned on 1, and on all others, O, then the digital signal from the first input of block 8 is connected to the second output, from the second input to the third output, and so on with a cyclic shift, t. e. with n-th. Entry - on the first exit.

Then the second block 4 of keys will be connected in series with time the voltage from source 7, which differs from and by the value of one step (or one step diestizing the harmonic signal) .. Therefore, the voltage Ui. after the second low pass filter 6 will be equal to

Where

and

f. f

A Sin (t + f) r

Where

Connecting 1 to the second control input of block 8, and O - for all the rest we get

fp- 2

Hl p

Thus, by assigning a unitary d-bit code, it is easy to adjust the phase shift with a step

, 2L

TT °,

Fig. 2 shows an example of the implementation of block 8 of co-U1 switches, which is performed on logical switches. signals (shrimer, multiplexers of 155 KP2 type), and in which the necessary cyclic shift is carried out, and the control is carried out by a unitary code, which is then converted into a binary one. Block 8 switches (when) works in accordance with the truth table:

The use of a unitary code makes it easy to manage.

the value of the phase shift from the computer.

If you complicate the switch block 8 by increasing the number of its inputs and outputs, you can set a phase shift and more than 2 (1. Such delay is necessary j, for example, when generating complex signals in radio communication systems.

Since the switching unit 8 is at low voltage on the logical switches of the signals, it has a high speed and does not introduce a delay in establishing the phase shift between the output harmonic sig- nals.

Claims (1)

Invention Formula A two-phase harmonic generator containing serially connected multivibrator and pulse distributor, the first, of which, ..., nth outputs of which are connected respectively to the first, second, ..., nth control inputs of the first block of keys, output whom R Ultrasound yi fput.2 Editor A.Dolinich Compiled by N.Matvienko Tehred L.Oleynik Proofreader M.Maksimishinets 3610/52 Circulation 816 Subscription: VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 five five 0 five 4094 connected to the input of the first low-pass filter, the second key block connected in series and the second low-pass filter, as well as the source of multi-level constant voltage, the first, second, ..., nth outputs of which are connected respectively to the first, second ,. .., the n-th signal inputs of the first and second key blocks, characterized in that, in order to control the magnitude of the phase shift between the output harmonic signals, the input control signal presented in the n-bit code is entered into it block com the first, second, ..., nth signal inputs of which are connected respectively to the first, second, .., nth impedance of the pulse distributor, the first, second, ..., nth outputs of the switch unit -connected respectively to the first, second ,, ..., nth control inputs of the second key block, and the control inputs of the switch block are the inputs of the n-bit code, phase shift.  Yf