SU744364A1 - Phase setting apparatus - Google Patents

Abstract

PHASE, DETERMINING DEVICE, containing the first and second frequency dividers, the INPUTS of which are connected to the transmitter, the first and second stroboscopic converters., The first. INPUTS of which are connected through an element of exact time delay between themselves and with the output of the first frequency divider, and their second inputs are connected via a filter to the output of the second frequency divider, the first and second low-pass filters, the first of which is connected to the output of the first stroboscopic converter, characterized by that, with the aim of expanding the range of operating frequencies and reducing the dither of the adjustable phase shift, it is equipped with an additional element - an exact time delay and an additional stroboscopic the converter, the OUTPUT of the first frequency divider is connected via an additional time delay element to one of the INPUTS of the additional stroboscopic converter, the second IG INPUT icoToporo is connected to the output of the second transducer, the OUTPUT is connected to the second with the lower frequencies. 4 4 oo with: 4

Description

The invention relates to electrical measuring equipment and is designed to obtain two sinusoidal signals with a precise phase relationship in the frequency range. A phase-forward device based on triggering multistable frequency dividers with digital filtering of output signals of a step-sous Russoidal form Ll is known. The disadvantage of the device is the complexity of the hardware implementation, which limits the possibility of their npaic tic application. The simplest and most effective task is to form two sinusoidal signals with an adjustable phase shift by shifting in the uiHpoKOf5 frequency range of rema4ts in a phase converter with a stroboscopic Frequency conversion according to the author. # 272428, Yul. No. 19, 1970. A device adopted as a prototype, which contains two frequency dividers connected to the Output of the master oscillator, two stroboscopic converters connected via one of the inputs through an element of exact time delay between and with the output of one of the frequency dividers, and the second input - with the output of the filtering device connected to the output of the frequency divider; two filter frequencies connected to the outputs of the strobe transducers; It is associated with the output of the second and the input of the first frequency dividers 2. The difficulty of obtaining small discrete phase change values at high frequencies is the prototype statistics. The aim of the invention is to reduce the sampling rate of the regulated phage shift and to expand the range of output frequencies of the phase supercontinuous device. The purpose of the invention is achieved by the fact that the first and second dividers h: the first and second dividers are connected to the reference generator, the first and second are: stroboscopic transducers, g: the first entrances of which are connected through an element of exact time delay between themselves and with the output of the first divider hour: second and second, their inputs through the filtering device Eny to the output of the second frequency divider, the first: and the second low-pass filters, the first of which is connected to the output of the first stroboscopic converter,: an exact time delay and an additional stroboscopic converter are introduced in series with an additional element time delay with one of the inputs of the additional stroboscopic converter, the second input of which is connected to the output of the second stroboscopic reobrazovatel, and an output - to a second lower fIJgtpom chasITOT, predste1vlena 1 is a block diagram of the device, timing diagrams are shown in Figure 2, illustrating its operation.. The device contains a master oscillator 1, the first and second frequency dividers 2 and 3, Filter 4, an element of exact time delay 5 to the output of frequency divider 3, an additional element of exact time delay 6, the first and second stroboscopic converters 7 and 8, an additional stroboscopic converter 9, The first and second filters are lower 4flCTot 10 and 11. The device works in the following way. The master oscillator 1 emits the follower. The number of pulses with a frequency. (period to (Fig. 2, a), which arrive at the input of frequency divider 3 with division factor n and input, frequency divider 2 with division factor (n -1) or (n - 1) (in the long run (nt -ij. Pulses from the output of frequency divider 3 with the period Tr-irtjj are transformed with the help of filter 4 to the sinusoidal voltage that is applied to the common inputs of stroboscopic transducers 7 and 8 (Fig. 26, c. Pulses from the output of frequency divider 2 (FIG. 2, d) form a sequence of strobe G, P1X pulses, arriving at the second inputs of the strobe converters / and 8. and the strobe transducer 7 goes directly to the strobe transducer 8 through an element of precise time delay 5. The period of the strobe pulses is nt ± t ,,. points of the signal to be converted are defined as 7 / ai ± nt | | / fQ n, the period of the output signal of the strobe converter, n (n-t1) t the frequency of the output signal fnp --- o / n (nli) (FIG. 2, e). In this case, the output signal has a symmetric, stepwise - asinusoidal shape. Shifting the sequence of strobe pulses by time with the help of an element of the exact time delay 6 (Fig. 2, e causes the output signal of the strobe converter 8 to be shifted by the time, which corresponds to the discrete change in the phase of the phase signal. N / 1; p 360 / (n ± 1; (fkg. 2, g).

This value of the discrete phase change is the minimum possible for the phase generator device by authspeed. No. 272428. To reduce the phase change, the gating pulses through the additional element of the exact time delay 6 are fed to the input of the additional strobe converter 9 1, 2, 3 /. The second input of this strobe converter receives a step-sinusoidal signal from the strobe converter 8. Shifting the strobe pulse sequence with an additional element of exact time delay b by time tg causes the output signal of the additional strobe converter 9 to also be shifted by time tg, which corresponds to a discrete phase change: to / Tnp -360 / h (n ± i), FIG. 2, i). Thus, the required value of the phase shift between the output signals of the phase-generating device is specified by an element of the exact time delay b with the sampling (n ± -1), and within this discrete it is specified as an additional element of the exact time delay b with the minimum discretion of the phase change, L V-ZBO / P ().

The output signals of strobe transducers 7 and 9 are filtered out from the outgoing harmonics by low-pass filters 10 and 11, Band (Passing these filters can substantially exceed the frequency of the output signal, which virtually eliminates their influence on the stability of the phase shift setting.

To obtain output signals of only sinusoidal, but also other, more complex forms, as the filter 4, you can use the functional converter of the digital code of frequency divider 3 to the voltage of a given forg / cl.

The precise time delay elements can be made in the form of discrete devices controlled by pulses from the outputs of the corresponding bits of frequency divider 2.

The introduction of new elements — an additional strobe converter and an additional element of exact time delay at the BfjjLje connections between the elements allows to significantly improve the metrological and operational characteristics of the phase-creating device and, first of all, to expand the operating frequency range and to reduce the phase change discretely. Compared to a known sampling device, the phase change is reduced by about a factor of / f. The frequency of the master oscillator f is limited by the speed of the element base used. At p 90 MHz and 1 / MHz, the phase change is reduced by a factor of 9 and is 4 ° (). The absence of selective filters in the channels ensures high accuracy and stability of setting phase shifts in a wide frequency range while the relative simplicity of the hardware implementation of the device. The device can be almost completely performed on digital integrated circuits.

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Claims (1)

<PHASOUSER DEVICE, containing the first and second frequency dividers, the inputs of which are connected to the master oscillator, the first and second stroboscopic converters, the first, the inputs of which are connected through the exact time delay element to each other and with the output of the first frequency divider, and their second inputs through the filter connected to the output of the second frequency divider, the first and second low-pass filters, the first of which is connected to the output of the first stroboscopic converter, characterized in that, in order to expand the range at the operating frequency and reduce diykreta controlled phase shift, it is provided with an additional element · accurate time delay and additional stroboscopic converter, wherein the output of the first frequency divider is connected via a further time delay element to one input of _a further scopic stroboscopic converter, the second input of which $ g It is connected to the output of the second stroboscopic conversion, and the output is connected to the second low-pass filter. (