SU760401A1 - Multi-phase self-oscillator - Google Patents

Description

The invention relates to radio engineering and can be used in a pulse technique.

Known oscillator containing _ operational amplifier and time-dependent ’resistor capacitor I D).

The disadvantage of this oscillator is the presence of only a single-phase output signal.

The aim of the invention is to simplify the device when receiving a different phase shift in adjacent vyhbdnyh channels.

To achieve this goal, a multi-phase self-oscillator containing a master, operational amplifier, a time-series resistor and a capacitor connected to the output of the operational amplifier, connected in series, introduced two slave and inverting operational amplifiers, a resistive divider, and resistors. operational amplifiers are connected to each other 25 through a resistive divider, to the outputs of the arms of which the non-inverting inputs of the master and slave operational amplifiers are connected and their inverting inputs are connected via

resistors to a timed capacitor, to which a non-inverting input of an inverting operational amplifier is connected via a resistor, and its inverting input is connected through a resistor to the output of a leading operational amplifier.

FIG. 1 shows a schematic diagram of a multi-phase oscillator; in fig. 2 sheds of stress diagram (a-9-)

The autogenerator contains a leading, a slave and an inverting opamp 1-4, respectively, a time capacitor 5, a timer resistor 6, a voltage divider consisting of resistors 7-10, resistors 11-15, inputs 16 ^ -23 operational amplifiers, outputs 24-27 operational amplifiers.

Voltage plots are shown in: a) time capacitor 5,

b) exit 26 slave operational go amplifier c) output 3, 25 slave operational go amplifier 2, d) exit 24 leading operational

amplifier 1,

d) the output 27 of the inverting operational amplifier l.

760401

The plot of the voltage of the capacitor 5 shows the points ί ₁ , I. ι ₇ , fixing the moments of time of change in the output voltages of the operational amplifiers 1, 2, 3, respectively.

The device works as follows.

Starting from the time point q, the output 24 of the leading operational amplifier has a high voltage level (plot b, fig. 2). The capacitor 5 begins to recharge through the resistor 6, tending to this level of the output voltage of the leading operational amplifier 1. In mo-. At the time point, the voltage on the capacitor 5 will reach the threshold value of the input voltage of the operational amplifier 3 set by the resistive divider on the resistors 7-10, causing the output voltage to appear at a low level (plot 5, fig. 2). In the process of subsequent recharging the voltage on the capacitor 5 at the time point will reach the threshold level of the operational amplifier 2, which leads to a change in the output 25 of the high voltage level to low. The recharging of the capacitor 5 continues when the threshold level of the operational amplifier 1 is reached at the time c, leads to a change in the voltage at its output 24 from a high to a low level, which leads to a recharging of the capacitor 5 in another direction. The low voltage level from the output 24 is supplied to the resistor 7 of the resistive divider and to the inverting input 22 of the inverting amplifier 4, which provides at its output a high voltage level (plot in *, Fig. 2). Thus, at the time point z, the potentials at the extreme points of the resistive divider change the polarity to the opposite, which ensures preservation of the switching sequence of the operational amplifiers (switching sequence: 3, 2, 1, 3, '2, 1 ..., etc. ). Further, the processes are repeated as described above.

FIG. 2 Dan case / when the resistive divider consists of equal resistors 7-10, which ensures equal shift in adjacent channels. However, in the general case, the resistors 7-10 can be chosen unequal to ensure an unequal phase shift in adjacent channels. By replacing the resistors 7-10 with potentiometers, you can smoothly rearrange the phase shift. If these resistors are replaced by semiconductor control elements, then electronic automatic restructuring of the phase shift in adjacent channels can be carried out according to the necessary law.

In a multi-phase oscillator, operational amplifiers 1, 2, 3 during the half-period provide a phase shift T / J (where T is the period of the output voltage of the leading operational amplifier 1) for three operational amplifiers with equal resistors 7-10.

To obtain the T / 6 phase shift in adjacent channels of six operational amplifiers, it is necessary to connect the inverting amplifier 4 to the output 24 of the leading operational amplifier 1 to the outputs 25, 26 of operational amplifiers 2.3.

Thus, to ensure ·. phase shift in the multiphase ^avtoge-: generator of equal to T, η (where η = 1, 2, 3 ...), require the use of operational amplifiers η.

If it is necessary to obtain sawtooth voltages shifted in phase, series-connected resistors and a capacitor are connected to the outputs of operational amplifiers in a similar way to connecting resistor 6 and capacitor 5.

Claims (1)

Claim A multi-phase oscillator containing a leading operational amplifier connected in series with a time-conducting resistor and a capacitor connected to the output of the operational amplifier, characterized in that, in order to simplify the device when receiving a different phase shift in the adjacent output channels, two slaves and an inverter are introduced into it ^? operating amplifier, resistive divider, resistors, the outputs of the leading and inverting operational amplifiers are connected to each other via a resistive divider, to the outputs of the arms of which non-inverting inputs of the leading and driven operational amplifiers are connected, and their inverting inputs are connected to the time-dependent capacitor to which a non-inverting input of an inverting operational amplifier is connected via a resistor, and its inverting input is connected via a resistor to the output of the master preamplifier.