SU677089A1 - Arrangement for shaping signals with calibrated phase shift - Google Patents

Description

one

The invention relates to a pulse technique.

A device for generating signals with phase shifts, consisting of a reference and two synchronized oscillators, two frequency dividers with a constant division factor, two frequency dividers with a variable division factor, two phase detectors and a mixer, is known.

This device does not allow signals with calibrated phase shifts to be received.

The closest to the technical essence of the invention is a device for generating signals with a calibrated phase shift, consisting of N frequency synthesizers, each of which contains a series-connected clock generator, a frequency divider with a variable division factor, a phase detector, a low-pass filter and an adder, the second inputs of the phase detectors are connected to the reference oscillator 2 through a frequency divider with a fixed division factor.

The disadvantage of this device is the small range of phase shift variations.

The aim of the invention is to increase the range of change of phage shifts.

The goal is achieved by the fact that a signal shaping device consisting of N frequency synthesizers, each of which contains a series-connected clock generator, a frequency divider with a variable division factor, a phase detector, a low-pass filter and an adder, the second inputs of the phase detectors through a frequency divider with a fixed coefficient of division, they are connected to a reference generator, a block of reference voltages is inserted, and an attenuator is inserted into each of the N frequency synthesizers, which is connected between the second input ohm adder and the input block of the reference voltage.

The structural electrical circuit of the described device is shown in the drawing.

The device consists of L identical frequency synthesizers 1-3, containing synchronizing oscillators 4-6, frequency dividers 7-9 with variable division factor, phase detectors 10--12, low-pass filters 13-15, adders 16-18, attenuators 19- 21. The device also contains a reference generator 22, a frequency divider 23 with a fixed division factor, a block of 24 reference voltages. The output signals are removed from the outputs 25-27.

A device for generating calibrated phase shifts operates as follows.

The inputs of the phase detectors 10-12 receive the signal of the reference generator 22, divided by the frequency divider 23 with a fixed division factor, and the second inputs of the phase detectors 10-12 receive the signals of the synchronizing generators 4-6, also divided by the dividers 7-9 frequencies with variable coefficients division. Phase detectors 10-12 form pulse sequences whose pulse duration contains information about the time (phase) ratios of the pulse sequences arriving at their inputs.

The constant components of the pulse sequences at the outputs of the low-pass filters 13-15 carry information about the pulse duration at the output of the phase detectors 10-12, i.e. about the phase mismatch of the signal of the reference oscillator 22 and the synchronized oscillators 4-6. This constant component can be found as a constant component of the Fourier series.

 0 - at GSH-f 1

O.G-I og

where is 7o..g; about. g is the pulse following period;

L - the amplitude of the pulses.

On the other hand, the constant component at the output can be expressed as a function of the phase difference of the signals acting on its inputs. This voltage is summed in adders 16-18 with constant voltages coming from a block of 24 reference voltages, the level of which is regulated by attenuators 19-21.

Taking into account that the division factors of the frequency dividers with a variable division factor in each synthesizer do not change, i.e. the output frequencies remain the same, the control signal voltage at the control input of each clock generator should remain unchanged.

Thus, a change in the signal level leads to a change in the current oscillation phase of a given generator.

Thus, with h identical synthesizers, if the transfer coefficients of attenuators are in relation to K-, K., / Cs ... K, then the phase increment of Df signals when the signal level changes will be proportional to the ratio:

A ",: L, ....,: / S,: ... / G".

Hence, it is clear that in order to realize all the smaller values of A, it is necessary to increase

attenuation attenuator in the corresponding synthesizer 1-3. It is understood that the components at the control input can be made arbitrarily small and thus achieve arbitrarily small increments of the corresponding input signals of the device.

The total constant components, affecting the synchronized generators 4-6, charge it with a phase. Phases

oscillations of synchronized generators

4-6 in this case are changed according to the law

voltage attenuator control

19-21.

Thus, the information laid down

in the control function introduced by attenuators 19-21, is transformed into the law of phase variation of synchronized oscillators 4-6, i.e., the device allows generating signals with calibrated phase shifts.

Claims (2)

1. Patent of Great Britain No. 1301840, cl. NRT, 12/14/73. 2. USSR author's certificate No. 372671, cl. N OZK 7/04, 15.12.71.