RU158948U1 - ANALOGUE STORAGE SUMMER - Google Patents

Abstract

The utility model relates to automation and computer technology and can be used in analog signal processing systems. The technical problem to which the claimed utility model is directed is to expand the functionality of the device by eliminating additional switching associated with the sign of the input signal, and improving performance. The task is achieved as follows. In an analog storage adder containing an integrator on an operational amplifier, the input of which is shunted by a capacitor, according to a utility model, electromagnetic relays with switching contacts are replaced by electronic switches with closing contacts, sign relays are excluded, voltage dividers for correcting the transmission coefficient, the integrator is replaced by a sampling device - storage, additionally introduced a large-scale amplifier and an adder on an operational amplifier.

Description

The utility model relates to automation and computer technology and can be used in analog signal processing systems.

The closest technical solution to the proposed one is an accumulative analog type adder (Patent SU 314211, published September 7, 1971, Bulletin No. 27) containing an integrator on an operational amplifier, the input of which is shunted by a capacitor through the contacts of the control relay, and voltage dividers connected in parallel.

However, the disadvantage of this circuit is that electromagnetic relays with switching contacts are used for switching, which reduces the speed of the device. In addition, for the implementation of the subtraction mode, correction of the transmission coefficient is necessary.

The technical problem to which the claimed utility model is directed is to expand the functionality of the device by eliminating additional switching associated with the sign of the input signal, and improving performance.

The task is achieved as follows.

In an analog storage adder containing an integrator on an operational amplifier, the input of which is shunted by a capacitor, according to a utility model, electromagnetic relays with switching contacts are replaced by electronic switches with closing contacts, sign relays are excluded, voltage dividers for correcting the transmission coefficient, the integrator is replaced by a sampling device - storage, additionally introduced a large-scale amplifier and an adder on an operational amplifier.

The essence of the utility model is illustrated by the drawing, where in FIG. 1 shows a functional diagram of the device, in FIG. 2 is a timing diagram of its operation. The input signal, represented by a continuous function of time U _inp (t), is supplied to a scale amplifier 1 with a gain k _u . The output of a large-scale amplifier is connected to the input of an analog non-inverting adder 2, made on the basis of an operational amplifier. The charge voltage of the capacitor C ₁ at the time of closure of the analog switch K ₁ under the control of f ₁ becomes equal to the voltage value at the output of the analog adder. Using the analog switch K ₂ , controlled by the signal f ₂ , the upper capacitors C ₁ and C ₂ are connected according to the scheme of the plates of the capacitors, which is equivalent to their parallel connection. The terminal C ₂ terminal is connected to the input of a non-inverting repeater based on an operational amplifier. The signal from the output of the repeater, which is also the output of the device, is fed to the second input of the analog adder.

The device operates as follows. It is known that the capacitor charge is determined by the expression Q = C · U, where C is the capacitance of the capacitor, U is the voltage of the charged capacitor. With a parallel connection of two charged capacitors, we can assume that

Where

U _p - charge voltage of two parallel-connected capacitors;

,

- напряжения заряда конденсаторов до момента их параллельного соединения.

,

- charge voltage of capacitors until they are connected in parallel.

. В момент t₁ происходит кратковременное замыкание ключа K₁ на время, достаточное для заряда конденсатора C₁. После размыкания ключа K₁ на конденсаторе C₁ в интервале времени t₁-t₂ удерживается напряжение равное

. В момент t₂ происходит замыкание ключа K₂ на время, достаточное для выравнивания напряжений

. После размыкания ключа K₂ напряжение на выходе устройства согласно (1) и (2):The initial state of the keys K ₁ and K ₂ is open, the voltage at the output of the device

. At time t ₁ there is a short circuit of the key K ₁ for a time sufficient to charge the capacitor C ₁ . After opening the switch K ₁ on the capacitor C ₁ in the time interval t ₁ -t _{2 the} voltage equal to

. At time t ₂ , the key K ₂ closes for a time sufficient to equalize the voltages

. After opening the key K _{2 the} voltage at the output of the device according to (1) and (2):

и упрощая выражение (3):Given that

and simplifying expression (3):

:Given that U ₁ = k _u · U _inp (t), and taking

:

Similarly, the device operates at intervals t ₃ -t ₄ and t ₅ -t ₆ . To reset the adder, the key K _{3 is} closed for a time equal to the discharge time of the capacitor C ₂ according to the signal f ₃ .

The technical result consists in simplifying the circuitry implementation of the adder by reducing the number of switching elements and eliminating additional transmission coefficient correction schemes associated with the sign of the input signal.

This device can be implemented industrially based on a standard elemental base.

Claims (1)

An analog accumulative adder containing electronic keys with make contacts, a scale amplifier and an adder on an operational amplifier, characterized in that the electronic keys with make contacts are connected to the output of an analog non-inverting adder based on an operational amplifier and the input of a non-inverting repeater based on an operational amplifier , the output of which the signal is fed to the second input of an analog non-inverting adder, made on the basis of the operating ilitelya, the noninverting output is also the output of the repeater device, and scaling amplifier output being connected to a first noninverting input of the analog adder.

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