SU1385233A1 - Digital multiphase oscillator - Google Patents

Abstract

The invention relates to radio engineering and communications. The purpose of the invention is to increase the accuracy of the phase shift setting. Hr contains accumulator adder 1, reference rr 2, block 4 of the phase shift setting, N channels containing memory register 8, DAL 9. Multiplexer 3 is introduced, converter. 5 codes, demultiplexer 6, shaper 7 clock pulses, memory register 11, and a low-pass filter 10 is inserted into each of the N channels. To set the required frequency of the signals (- the code of the corresponding number Mr. is entered at the outputs of Mr. G. The values of the numbers M ,, corresponding to the phase shifts are set at the outputs of block 4, and M.M, iri and fc (f or -Mf) / M wrtKcN, where the frequency of the signal is 2; Mf is the number corresponding to the required frequency of the output signals; m is the accumulator accumulator 1. Shaper 7 provides synchronous control of multiplexer 3 and demultiplexer 6. This ensures that the information supplied “to input of adder 1 and input co ... T.obr sponding channel, the Optional values) zovogo shift between .sig- nalami formed depends only on z °. The values of numbers M, k-precision specifying ryh and determines the accuracy of the offset setting faz.1 yl. (L with 00 sd to with with

Description

The invention relates to radio engineering and communications and can be used in measuring equipment and in a frequency synchronizer.

The purpose of the invention is to increase the accuracy of the installation of phase shift.

The drawing shows a structural electrical diagram of a digital multiphase generator.

The digital multiphase generator contains an accumulating adder 1, a reference oscillator 2, a multiplexer 3, a phase shift setting unit 4, a code converter 5, a demultiplexer 6 a pulse shaper 7, N channels, each of which contains a memory register 8, a digital-to-analog converter 9, and a filter 10 low frequencies, additional memory register 11.

Digital multiphase generator operates as follows.

At the output of the accumulating adder 1, the binary code changes with the frequency of the reference oscillator 2 in accordance with the information ^ coming from the output of the multiplexer 3, which switches the outputs of block 4 and the additional register 11, i.e. the process of summing the values of binary codes installed at the outputs of block 4 and the additional register 11 is carried out. The summation result ³ is input to the converter 5, from the output of which the ordinates of the generated signal * with the help of demultiplexers 6, controlled by the pulses of the former 7, are distributed over N channels. In each of the N channels, with a frequency N times less than the frequency of the reference oscillator 2, the ordinates are recorded in the register 8, of which the digital-to-analog converter 9 and filter 10 generate a signal at one of the N outputs of the digital multiphase generator. The frequency of the signal at each of the outputs of the digital multiphase generator is determined from the relation ₌ -for - M _£ ^s M _Makc N where f _or is the signal frequency of the reference generator 2;

M _f is the number corresponding to the desired value of the frequency of the output signals;

~ the capacity of the accumulating adder 1;

N is the number of channels.

To set the required frequency of the signals at the outputs of the digital multiphase generator, the code of the corresponding number Mp is entered in the additional register 11. The values of the numbers M. corresponding to the phase shifts are set at the outputs of block 4, and <

N M (- M _mex .

Shaper 7 provides synchronous control of the multiplexer 3 and the demultiplexer 6, which ensures that the information supplied to the input of the accumulating adder 1 and the input of the corresponding channel. Thus, the value of the phase shift between the generated signals depends only on the values of the numbers M ;, the accuracy of which determines the accuracy of setting the phase shift.

Claims (1)

Claim A digital multiphase generator comprising a series-connected reference oscillator and an accumulating adder, a phase shifter, and N channels, each of which contains a series-connected memory register and a digital-to-analog converter, characterized in that, in order to increase the accuracy of the phase shifter , introduced an additional memory register, a multiplexer, a series-connected code converter and a demultiplexer, as well as a synchronizing pulse shaper, and in each of the N channels the output of the digital-to-analog converter is connected to the input of the input low-pass filter, the output of which is one of the N outputs of the digital multiphase generator, the input of the synchronizing pulse generator is connected to the output of the reference generator, the output of the synchronizing pulse generator is connected to the control input of the demultiplexer and to the control input of the multiplexer, the output of which is connected with the information input of the accumulating adder, the outputs of the phase-shift installation unit and the output of the open-loop memory register ti are connected to respective data inputs of the multiplexer, the output accumulating-conductive adder connected to the input of pre-forming the codes memory registers inputs of each of N channels us connected to the respective outputs of the demultiplexer.