SU1484163A1 - Analog storage - Google Patents

Abstract

The invention relates to automation and instrumentation technology used to memorize selective voltage values. The purpose of the invention is to improve the accuracy of an analog storage device. In the sampling mode, when the switches 3 and 5 are closed, the operational amplifier (op-amp) 1 is covered by negative feedback through a voltage follower 2, keys 3, 5 and a resistive voltage divider 7. In this case, a voltage proportional to the input voltage is monitored on the capacitor 6 devices. The errors of the voltage follower 2 in the proposed device are suppressed in contrast to the prototype, where the repeater is located at the input of the OU, which determines the increase in the accuracy of the proposed device. 1 il. a 5s

Description

The invention relates to automation and measurement technology and can be used to memorize selective knowledge of the voltage of an analog signal.

The purpose of the invention is to improve the accuracy of an analog storage device.

The drawing shows a functional diagram of the device.

The device contains an operational amplifier (OA) 1, voltage follower 2, switches 3-5, a storage element on the capacitor 6 and a resistive voltage divider 7.

The device works as follows. In sampling mode, the keys 3, 5 are closed, and the key 4 is open. In this case, ОУ 1 through the keys Зг 5, voltage follower 2 and resistive divider 7 are covered by negative feedback, as a result of which the voltage

at the output of the op-amp 1 and at the capacitor 6 it monitors the input voltage of the device with a proportionality coefficient determined by the ratio of the resistances of the resistors in divider 7. When switching to storage mode, keys 3 and 5 open and key 4 closes. OS 1 is not saturated, since it is covered by negative feedback through switch 4. Voltage stored on capacitor 6 is transmitted to the output of the device via voltage follower 2.

In the proposed device in the storage mode, the output voltage is the sum of the voltage on the capacitor 6 and the voltage on the inverting input of the op-amp 1. The latter is close to zero, but has a component proportional to the input voltage of the device in the storage mode, weakened by Kp times where CR is the gain coefficient of the OS.

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Claims (1)

However, the interference of the through passage of the input signal in the proposed device is small, since the other component of this interference passes to the capacitor 6 through a pair, the total capacitance of the key 3 with a negative sign and compensates for the first component, while the voltage follower 2 in the proposed the device is suppressed K times, and in the prototype is not suppressed, because there the voltage follower is connected between the midpoint of the resistive voltage divider and the input of the op-amp. This circumstance determines the higher accuracy of the proposed device. Invention Formula Analog memory device containing an operational amplifier, the non-inverting input of which is connected to the zero potential bus On the device, the accumulative element on the capacitor, one capacitor of which is connected to the inverting input of the operational amplifier, the resistance of the voltage, the first output of which is the input of the device, the voltage repeater, the output of which is connected to the input the first key, the second key, about the fact that, in order to increase the accuracy of the device, a third key is inserted into it, the output of which is connected to another lining of the con- the sensor and the input of the voltage follower, the output of which is the output, the device, the inputs of the second and third switches are connected to the output of the operational amplifier, the inverting input of which is connected to the middle point resistive divider nzhpruzhi, the second output of which is connected to the outputs of the first and second keys.