SU1569947A1 - Device for controlling transconductance of operational voltage-current converters - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to improve the accuracy of steepness control. The device contains a quasilinear operational converter 1 voltage - current, current sources 2 and 3, resistor 4, current phase splitter 5, reflectors 6 and 7 of flowing and flowing currents, capacitors 8 and 10, synchronous detector 9, driver 11 pulses and r-r 12 alternating voltage The principle of operation of this device is based on the application of alternating voltage to the input of converter 1. By appropriate selection of control signals, the required output current is obtained at each point of amplitude x-ki of converter 1 so that when the input voltage changes, it is not necessary to change signals. Only in this case the amplitude x-ku of the converter 1 of the required linear type is obtained. The goal is achieved by providing an automatic installation of the control signals of the transducer 1. 2 Il.

Description

The invention relates to radio engineering and can be used in analog signal processing.

The purpose of the invention is to improve the accuracy of steepness control.

Figure 1 shows the structural electrical circuit of the device; Fig. 2 is a graph of output current of a quasilinear voltage converter versus current versus input voltage.

The device (FIG. 1) contains a quasi-linear operational voltage-current transducer (CLTRT) 1, the first 2 and second 3 current sources, the resistor 4, the phase splitter reflectors 6 and 7 of the outgoing and flowing currents, the first capacitor 8, the synchronous detector 9, the second the capacitor 10, the pulse shaper 11 and the alternating voltage generator 12. In this case the CLOCN 1 is made according to a known scheme.

The device works as follows.

A special feature of CLOTS, in contrast to SNTPs, is the presence of two degrees of freedom, available in CLOTS to form its amplitude response (AH), i.e. to form the output current versus input voltage. The first degree of freedom is provided by the presence in the CLOCK of the control slope input, and the second degree of freedom is provided by the presence of the voltage control on the coupling of the dependencies of the output currents on the input voltage of the CLOT switch shoulders. The presence of two degrees of freedom leads to the fact that one desired value of the output current of a CLTRT at a given input voltage can be obtained by an unlimited number of combinations of control signals of the CLART (FIG. 2, curve I shows the desired dependence of the output current on the input voltage of the CLTRT). Now, if you follow the principle on the basis of which the well-known device is implemented and according to which the required output current of the SSCENT is set with a single specified value of the input voltage (voltage on the resistor 4), then it is possible to accurately establish such control signals of the SSTC that would provide type I dependence (Fig. 2u. If the voltage sources

the voltage of the connection is somewhat higher or lower than the required voltage, then the known device implements curve II or III (figure 2).

The principle on the basis of which the proposed device operates is that alternating voltage is applied to the input of the CLOTENT 1 and by appropriate selection of control signals, the required value of the output current at each point AX is obtained so that when the input voltage is changed be

5 values of two control signals. Only in this case it is possible to obtain AX CLOCK 1 of the required linear form, i.e. curve type I (figure 2). The device implements the described

Q principle as follows.

 The first inverting inertial link is organized by means of the current phase splitters 5, the first 6 and second 7 reflectors and the first capacitor 8, which allows the voltage of the alternating voltage generator to be set at the control input of the slope CLART 1;

Q current I3 (t) voltage controlled second voltage source 3 current and current

five

0

five

0

five

 (t) CLOCK

1 is zero, i.e.

the relation is satisfied

l - w) °.

- about

where T is the period of the generator frequency

12 alternating voltage.

By means of the current factor 5, the first 6 and second 7 reflectors, the synchronous detector 9 and the second capacitor 10, a second inverting inertial link is organized, which allows the CLOTC 1 connection voltage to be set at the control input of the coupling voltage, which is the instantaneous difference between the current I 3 (t) and the current I Bbl (t) is zero at each time point, i.e. the relation is satisfied

ii (0 -) o.

Thus, the proposed device allows the automatic setting of the control signals of CLOTENT 1 so that CLOTENT 1 has a linear AH of type I (Fig. 2). Using these control signals, you can apply them to the control inputs of other CLOTS implemented on a single chip with the proposed device, and

to obtain quasilinear operational voltage-to-current transducers with a given slope value equal to

1 Is

8G -i

where 1 ,,, are the amplitudes of the current, respectively, controlled by the voltage of the first 6 and second 7 current sources; R is the resistance of the resistor 4. The synchronous detector 9 can be implemented on the basis of a balanced modulator circuit or a four-quadrant multiplier, in which the current inputs can be controlled current sources and the reference input is the jog input of the device used. In addition, for the operation of the device, it is necessary that the first inertial link has a time constant longer than the time constant of the second inertial link.

Claims (1)

Invention Formula The operating voltage converter slope control unit is a current containing the first and second current sources, the first terminals of which are connected to the power supply bus, the operational voltage converter is the current and the resistor, the first output of which is connected to the common bus, and the second output is connected to the second output the first current source and the inverting input of the operating voltage converter is the current, the non-inverting input of which is connected to the common bus, and the output to the second output of the second current source, characterized by o, in order to increase the accuracy of steepness control, a current phase is introduced S 0 a splitter, a leakage current reflector, and a flowing current reflector having first and second outputs, first and second capacitors, a synchronous detector, a pulse driver, and an alternating voltage generator, while the first and second current sources are controlled and the operating voltage converter — the current is made by a quasilinear operational voltage converter — a current having a voltage control input coupling the dependencies of the output currents on the input voltage of the arms of the quasilinear opera A voltage converter is a current, and the output of a quasi-linear operational voltage converter is a current connected to the input of a phase shifter, the outputs of which are connected to the inputs of the reflectors of the outgoing and flowing currents, respectively, the first outputs of which are connected to the control input of the steepness of the quasi-linear operational converter, and the first outputs of which are connected to the control input of the steepness of the quasi-linear operational converter, and the first outputs of which are connected to the control input of the steepness of the quasi-linear operational converter, through the first capacitor - to the common bus, the second outputs of the reflectors of the outgoing and flowing currents are connected, respectively, with the first and second current the inputs of the synchronous detector, the current output of which is connected to the voltage control input docking the dependencies of the output currents on the input voltage of the arms of the quasilinear operational voltage converter - current and through the second capacitor - to the common bus, the Q output of the alternator is connected to the control inputs the first and second current sources and the pulse driver input, the output of which is connected to the support of the synchronous detector. five 0 five Vi inVHO Fig.i