SU1453591A1 - Phase shifter - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to ensure the stabilization of the phase shift when the duty ratio of the input signal changes. The phase shifter contains an inverter I, dividers 2 and 3 frequencies into two, channels 4 and 5, each of which consists of a saw 6 voltage driver, low pass filter 7, and an el 8 with adjustable kosf. transmission and comparator 9, as well as RS-trigger 10. The input pulse signal is fed to divider 2 and through inverter 1 to divider 3. Output voltages of divider 2 and. 3 have a rectangular shape with a borehole ratio of two, regardless of the pulse ratio of the input signal. In this case, the phases of the signals are shifted relative to each other by an amount equal to the pulse duration of the input signal. The signals from dividers 2 and 3 are converted into channels 4 and 5 and then sent to the S and R inputs of the RS flip-flop 10, respectively. As a result, rectangular pulses are formed at its output, the duration of which is equal to the duration of the input signal pulses input signal is determined by the coefficient. G1 transmission of el-8. The goal is achieved by the introduction of dividers 2 and 3. 2 ILO (O (L

Description

Phie.1

The invention relates to radio engineering and can be used in devices where an adjustable phase shift from 0 to 180 ° is necessary.

The purpose of the invention is to stabilize the phase shift when the duty ratio of the input signal is changed,

Figure 1 shows a structural electrical circuit of a phase shifter; FIG. 2 shows timing diagrams explaining his work.

The phase shifter contains an inverter 1, the first and second dividers 2 and 3 frequencies into two, the first and second channels 4 and 5, each of which contains a sawtooth voltage shaper 6 low pass filter 7, an element of 8 with adjustable transmission coefficient, a comparator 9 and short circuit trigger 10,

Phaser works as follows.

The input pulse signal (Fig 2a) is fed to the input of the first divider.

2 frequencies for two and through inverter 1 (FIG. 26) - to the input of the second divider

3 frequencies for two. The output signals of the first and second dividers 2 and 3 frequencies are two rectangular-shaped voltages with a duty cycle of two (FIG. 2B and d) regardless of the pulse ratio of the input signal, while the signal phases are shifted relative to each other by an amount equal to the input pulse duration. signal, with the outputs of the first

and the second dividers, and 3 frequencies for two signals are fed to the inputs of the first and second channels, respectively

4 and 5, which are the inputs of the formers 6 sawtooth voltage, the outputs of which are formed sawtooth voltage (Fig, 2d

and e) The constant component of the output signal of the sawtooth voltage formers 6, highlighted by the corresponding low-pass filter 7, through the element 8 with an adjustable transmission coefficient is fed to the first input of the comparator 9 (fig. 2d and e, dashed line) To another input of which a sawtooth voltage is supplied directly from the output of the former 6 of the sawtooth voltage of the same channel,

At the outputs of the comparators 9, rectangular pulses are formed corresponding to the points in time when the signals at the outputs of the sawtooth voltage formers 6 exceed the signal at the output of the element 8 with an adjustable transmission coefficient (Fig. 2g and 3h). The pulses from the output of the comparator 9 of the first channel 4 are fed to the S input of the RS flip-flop 1 O and the leading edge sets it to the state of the logical unit c, The pulses from the output of the comparator 9 of the second channel 5 arrive at the R input of the RS flip-flop and the leading edges are set it is in the state of logical zero. As a result, rectangular pulses are formed at the output of the RS flip-flop 10, the duration of which is equal to the duration of the pulses of the input signal, and the phase shift relative to the phase of the pulses of the input signal is determined by the transfer coefficient elements 8 with adjustable transmission ratio. By changing the transmission coefficient of elements 8 with an adjustable transmission coefficient, the phase shift of the output signal of the phase shifter can be changed in the range of 0-180 °, and the phase shift value does not depend on the pulse ratio of the input signal when the pulse ratio of the input and output signals is equal (Fig. 2i).

Thus, the introduction of the first and second dividers 2 and 3 frequencies into two, performed, for example, on triggers, makes it possible to stabilize the phase shift of the output signal when the duty ratio of the input signal changes, even if the voltages of the sawtooth 6 formers 6 in the first and second channels are unequal. phase reader

Claims (1)

Invention Formula A phase shifter containing an inverter, the input of which is the input of the phase shifter, has two channels, each of which is made as a series-connected sawtooth voltage former, whose input is the input of a channel, a low-pass filter, a variable gain element and a comparator; the input of which is connected to the output of the sawtooth voltage former, the outputs of the comparators being the outputs of the first and second channels and connected respectively to the S and R inputs of the RS flip-flop, the output which is an output of a phase shifter, characterized in that, in order to stabilize the phase shift when changing the duty cycle of the input signal pulses, the first and second frequency dividers are introduced by two that are connected between the input of the inverter and the input of the sawtooth pilot of the first channel and the output of the inverter and the driver of the sawtooth voltage of the second channel, respectively. but. about and n n n pp 1 GP g FIG. 2