SU803103A1 - Active phase circuit - Google Patents

Description

(54) ACTIVE PHASE CIRCUIT

The invention relates to communication technology and can be used in the construction of correctors and delay lines.

The active phase circuit is known, containing the first resistor connected by one output to the input of the active phase circuit, the first operational amplifier with the first capacitor in the negative feedback circuit and the second resistor, one output connected to its output, the second operational amplifier whose non-inverting input is connected with a common length through the third resistor, as well as the second capacitor and the fourth and fifth resistors 1.

However, the known active phase contour has a dependence of the group delay time and resonant frequency adjustments and a large number of adjustable elements.

The purpose of the invention is to ensure the independence of adjustment of the group delay time and the resonant frequency while reducing the number of adjustable elements.

To do this, in the active phase circuit, containing the first resistor connected by one output to the input of the active phase circuit, the first operational amplifier with the first capacitor in the negative feedback circuit and the second resistor, one output connected to its output, the second operational amplifier, "non-inverting input which is connected to the common length through the third resistor, as well as the second capacitor and the fourth and fifth resistors, the second terminals of the first and second resistors are connected respectively

with non-inverting inputs of the first and second operational amplifiers, the second capacitor is connected between the input of the active phase circuit and the non-inverting input of the second operational amplifier, the fourth and fifth resistors are connected between the output of the second operational amplifier and the non-inverting input of the first and the inverting input of the second operational amplifiers, respectively, inverting the inputs of the first and second operational amplifiers are combined. .

The drawing shows the electrical circuit of the proposed active phase circuit.

The active phase circuit contains the first 1 and second 2 operational amplifiers, the first 3, the second 4, the third 5, the fourth 6, and the fifth 7 resistors, respectively, the first 8 and second 9 capacitors, respectively. The first operational amplifier 1 has an inverting input 10 non-inverting input 11 and output 12. Amplifier 2 has an inverting input 13, a non-inverting input 14 and an output 15.

The operation of the active phase contour is accomplished with the aid of the transfer function.

R, RL

Ra T j.

W

-GKZHLG, .Ra.Ri.

- R-pCHr

RI Pa.Ra K 1 (RsCiVa

where R1 is the resistance of the resistor 5;

K.2-resistor 3;

RS is the resistance of resistor 6;

R4 is the resistance of resistor 4;

RS is the resistance of the resistor 7;

С I - capacitor capacity 8;

C 2 - capacitor capacity 9;

With R2 Ra, expression (1) is converted to

T, R KGSG KtsK5S.Sd. P,

Expression (2) is fully consistent with the structure of the phase circuit.

T rrd

(3) u ;,

where Q-quality contour; Sho - resonant frequency;

p - operator.

By comparing expressions (3) and (2), one can easily obtain the necessary calculation relations for calculating the parameters of the contour

 /,

 ()

60fVR7R7c7cr

..

 Vw

The expression for the rearrangement of the group delay time 1 will be

1 VR.RsCA .W

From the obtained relations (4) and (6) it can be seen that with the help of the resistor 5 it is possible to carry out a rearrangement of the group delay time ti). (i.e., Q-factor Q), and with the help of a resistor 4 (or 7) re-tuning the resonant frequency with a broad range. Both rearrangements are independent of each other and have no effect on the amplitude response of the phase circuit. Thus, the proposed active phase circuit provides the desired smooth and independent adjustment of the group delay time and the resonant frequency.

Claims (1)

Invention Formula Active phase circuit containing the first resistor connected by one output to the input of the active phase circuit, the first operational amplifier with the first a capacitor in the negative feedback circuit and a second resistor, one output connected to its output, a second operational amplifier, the non-inverting input of which is connected to the common bus through a third resistor, and a second capacitor and the fourth and fifth resistors, characterized in that the purpose of ensuring the independence of adjustment of the group delay time and the resonant frequency while reducing the number of adjustable 0 elements, the second terminals of the first and second resistors are connected respectively to the non-inverting inputs of the first and second operational amplifiers, the second capacitor is connected between the input of the active phase circuit and the non-inverting input of the second operational amplifier, the fourth and fifth resistors are connected between the output of the second operational amplifier and the non-inverting input of the first and the inverting input of the second op amp, respectively, while the inverting inputs of the first and second op amps teley combined. , Sources of information taken into account during the examination 1. “Electrosv, 1973, No. I, p. 70 (prototype). W Bx J // / J Bd / X / Gi