SU731395A1 - Phase calibrator - Google Patents

Description

The invention relates to an electrically radioelective tehnike and is intended to receive two sinusoidal signals with exactly specified phase phases: and in a wide frequency range. five

A phase calibrator based on thriller M1-resistant frequency dividers is known, which is characterized by a high accuracy of specified phase shifts 1.

The disadvantages of the well-known calibrator O Yail ets limited range of operating frequencies, not exceeding the Kaix etravilo (0.5-1) MHz.

A phase calibrator, adopted as a lototil, is known and contains a 5; o1 and th generator, two frequency dividers, one of which is connected to the output of the oscillator (, its generator and control device, and (the OUTPUTS of both frequency dividers are connected to filtering devices. 20 The last loliens based on cyMviaToppsz and triggers connected to the outputs of the bits of the frequency divider 2.

The difficulty of obtaining small values of 25 dIOhret phase change in the area of airflow, their working dialazo frequency is its main drawback.

The aim of the invention is to reduce the sampling rate of the adjustable phase.

unzira and expansion of the diaphragm rao () frequency of the phase calibrator.

This goal is achieved by the fact that in the phase calibrator, which contains the master oscillator, jiepiBbii and the second frequency divider, the inputs of the first frequency frequency divider are connected respectively to the outputs of the master oscillator and the control unit, and the outputs of both frequency divider are connected to the first and 1st second filters, respectively. a synchronized generator and a synchronization device, interconnected, with the output specified, 1 its generator connected to the synchronization device and, and the output of the synchronized generator and control device tim connected with soot1vetstzenno Lsrzym and second inputs of the second frequency divider.

In the drawing, a structural diagram of the phase calibrator is shown.

Phase Calibrator contains

set the generator /, synchronized. generator 2, device snnhro.nizatsii 3, the first and SECOND frequency dividers 4 and 5,

control unit 6, pepy and second filters D and 5.

Ra: fl:; from p. (C, way.

Frequency dividers 4, 5 with division factors K and Kz are input

coherent oscillations from the output of the master oscillator 1 with the frequency foi K, F ,, i; sync generator 2 with frequency

/ 02 Kzfi ,,

where f in - (upper limit frequency of the phase calibrator.

The ratio of gene frequencies: Rotor O1v /, 2 is accurate to the phase It is supported by devices of synchronization 3, which can be extracted by | P, pImer, on the basis of phase auto-tuning frequency circuits.

The diacret of the change in phase of the frequency dividers 4, 5 is determined by coherence, expressed as Af1 360 // (1 1Df2 -360 // C2.

In this case, the diokret of the HSvMeHeHHH phase shift between the output signals of the frequency dividers will be equal to Df Acro-Lf, 360 (K, -K2) / K: K2.

Minimum sampling of phase shift changes is obtained when K2 Ki-l Af „„ n 360 // (,. (Ki-l). This is () times less than in the prototype. At the same time, foi

 .

The required phase shift values between the output signals of the phase calibrator are set by using control unit 6, for example, by presetting the frequency dividers, or decoding them to STABLE; X STATUS.

Filters 7 and 5 convert rectangular signals from the outputs of the frequency dividers into output signals of a given shape, most often sinusoidal. Both analog and digital filter methods can be used for this purpose.

To discretely change the frequency of the output signals without tuning the oscillators into the phase calibrator channels, additional frequency dividers may be included.

By comparison with the prototype discrete, the phase shift change decreases by a number of times equal to foz / Pa ratio or c) times. The frequencies of the generators / o M are limited by the element base used. At / 01 90 MHz, Fa 10 MHz, Ki 9,

The 02 80 MHz sampling phase change is reduced by a factor of 8 and is 5 °

TaiKoe can be implemented on integrated circuits 137, 138 or 100 series. To obtain the same discrete phase shift in a known device, a frequency of the master oscillator of 720 MHz is necessary.

The discrete signal AF 5 ° at a frequency of 1 MHz can be obtained at / oi 9 MHz and MHz.

Such a device is easily implemented on low-speed integrated microcircuits (130, 133 series). For this device, in this case, the frequency of the master oscillator is 72 MHz, which requires the use of a sufficiently high-speed element base.

F o m u l a and 3 o b e te n u

The phase calibrator containing the master oscillator, the first and second frequency dividers, the inputs of the first frequency divider are connected respectively to the outputs of the master oscillator and the control unit, and the outputs of both frequency dividers are connected respectively to the first and second filters, characterized in that adjustable f-base shift and spreading of the operating frequency range, it is equipped with a synchronized generator and a synchronization device, interconnected between them, with the output of the master oscillator n dsoediien synchronization to a device, and the output synchronous generator and the control device are respectively connected to first and second inputs of the second frequency divider.

Source (information, taken into account during the examination:

Ü AiBTOpiOKoe USSR certificate No. 464864, cl. G 01 R 25/04, 1974.

2. USSR author's certificate. YO 434332, cl. G 01 R 25/04, 1973.

Claims (1)

The phase calibrator containing the master oscillator, the first and second frequency dividers, the inputs of the first frequency divider are connected respectively to the outputs of the master oscillator and the control device, and the outputs of both frequency dividers are connected respectively to the first and second filters, characterized in that, in order to reduce the adjustable phase shift and expansion of the operating frequency range, it is equipped with a synchronized generator and a synchronization device interconnected, and the output of the master oscillator is connected to the synchronization device, and the output of the synchronized generator and the control device are connected respectively to the first and second inputs of the second frequency divider.