SU853629A1 - Timebase operational amplifier - Google Patents

Description

(54) TRAVELING OPERATIONAL AMPLIFIER

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The invention relates to a pulse technique and can be used to convert low power signals.

A device containing an adder, an oscillator, an integrator 1.

The drawback of the device is a large drift error with an integer ratio of the frequencies of the carrier oscillations and external interference.

The closest in technical essence is a deploying operational amplifier containing a series-connected first adder, a main integrator, a second adder, a relay element, a third adder, an additional integrator, a fourth adder, an element with a dead zone, the output of which is connected to the output of the device and the second input of the third the adder, the output of the relay element is connected to the second input of the first adder, the first input of which is connected to the input of the device, connected by a series flax rectifier unit and the multiplier 2.

The disadvantage of this device is the large error in signal recovery.

The aim of the invention is to improve the accuracy of the device.

The goal is achieved by the fact that in a developmental operational amplifier containing a first adder, a rectifier unit whose input is connected to the device input, a second adder connected in series, the first input of which is connected to the device input, the integrator, the third adder, relay element, amplitude a modulator, an inverter is introduced, the output of which is connected to the second input of the third adder, and the input is connected to the second input of the second adder, and to the output of the modulator, the second input of which is connected to the output of the first sou The mapper, the first input of which is connected to the output of the rectifying unit, and the second input is connected to the bus of the control voltage source.

FIG. i shows the functional diagram of the proposed amplifier; in fig. 2 shows the timing diagram of the device.

The device contains the first sum.mator 1, connected in series to the second adder 2, the first input of which is connected

to the device input, the first integrator 3, the third adder 4, the relay element 5, the amplitude modulator 6. The deployment operational amplifier also includes the rectifying unit 7, the inverter 8, the input of which is connected to the output of the modulator 6, to the second input of the second adder 2 and to the output of the device, and the output to the second input of the third adder 4.

The device works as follows.

The second adder 2, the integrator 3, the adder 4, the relay element 5, the amplitude modulator 6 in a closed loop form a generator.

If there is no input signal X (t) at the input of the device, the amplitude of the pulses at the output of the device is determined by the value of the control voltage Xo, and their duration depends on the duration of the pulses at the output of the relay element 5. The output pulses of the device Y (t) (see Fig 2a) in the inverter are inverted and fed to the second input of the adder 4 (Fig. 26), where the operation of subtracting the sequence of triangular pulses Yf, (t) from the output of the integrator 3 and the sequence of square pulses - KY (t) of the inverter 8 (see Fig. 2a, b). As a result, the initial value of the switching thresholds of the relay element 5 is formed.

When there is an input signal at the input of the device (Fig. 2c), the amplitude increases at the outputs of the amplitude modulator 6, and the inverter 8 (Fig. 2d, d), which is the result of the summation of the signals / X (t) / and Xfl. The signal at the first input of the adder 4 is the modulus of the input signal X (t), which is generated in the rectifier unit 7.

At the same time in the device with a change in amplitude, the frequency of the output signal Y (t) changes. As the output signal amplitude Y (t) increases, the amplitude of the signal at the output of the inverter 8 increases, which leads to a decrease in the voltage thresholds of the switching element 5 from ± ± bo (Fig. 2a) to ± bo (Fig. 2d). As the voltage of the switching threshold of the relay element 5 decreases, the frequency of the output signal .y (t) increases.

Thus, this device provides a change in the amplitude and frequency of the output signal depending on the value of the input signal, which allows for the demodulation of the output signal Y (t) to use a filter with a smaller time constant than in known devices.

The inclusion of an inverter contributes to a sharper dependence of the frequency of self-oscillations of the developmental operational amplifier on the input signal X (t), which leads to the expansion of the frequency band of the device. As a result, the dynamic accuracy of the amplifier is increased.

Claims (2)

1.M. Shin A.I. and others. Converters of electrical parameters for systems control and measurement, M., "Energie, 1976, p. 62. 2. USSR author's certificate number 674040, cl. G 06 G 7/12, 1977. CC oh oh / X / iJ const 7 y z d. / z X Xv X / / ; K. (I)