SU693388A1 - Signal adding device - Google Patents

Description

(54) DEVICE FOR CYFIMPOBAHHH SIGNALS

; -. .. 1- V

This invention relates to the field of automation and computational technology, in particular, analog computing technology.

Lime) dL summing devices, signals consisting of two series-connected summing op amps 1. Such devices are used to obtain weighted sums of input naggings, to invert the voltages as PIDs. The disadvantage of such devices is the inaccuracy of the transfer coefficients and their instability caused by the instability and inaccuracy of the digital resistors.

The closest technical speech to the present invention is a device for summing signals, containing a resistive voltage divider, the extreme terminals of which are the inputs of the device, and the middle output is connected to a non-inverting input of the differential amplifier, connected to an inverter input to one output jack. ; the resistor and through the feedback resistor to its

output, which is the output of device 2.

The disadvantage of such a device is its high stability and accuracy.

The purpose of the invention is to improve the stability and accuracy of the device.

It is achieved that the device contains an additional resistive voltage divider, a switching unit, the first output of which is connected to the control inputs of four pairs of switches, and three additional differential amplifiers, the outputs of which are connected to the other terminals of the respective scale resistors, and the control inputs: to the second output of the switching unit, the extreme terminals of the additional resistive divider n-apr are connected via two pairs of keys to the inputs of the device and ... through two other pairs of keys to the first

inputs of two corresponding additional differential amplitudes ey, the second inputs of which are connected to the inputs of the device, the first input of the third additional differential amplifier IK is connected to the middle output of the additional real voltage divider, and its second input is connected to the output of the device. FIG. 1 shows a structural circuit diagram of the device; Fig, 2 - option, device, rabog. melting in the {inversion mode; in fig. 3 - the same in double mode; on. FIG. 4 - use of the device for apgebraic summation with arbitrary coefficients,. ; ; ./: . The device contains a 1 dArm resistive divider with extreme pins 2 and 3 and a middle terminal 4, a differential amplifier 5 with non-inverting input b, input 7 and output 8 and resisgr. 9 C W of the reverse link, In addition to the Thr67, three additional differential amplifiers, the U-12 with 13–15–15, with the second inputs 16–18 and the outputs 19–21, BLOCK, were introduced into the system; 22 commutation with outputs 23 and 24, dog1SYYTyolnyy rosil divider 25 npap 5keyi with extreme vyvyami; . 26 and 27 and middle driver 28, keys 29; - $ 3, to the inverter to the main input 7 differential 1rgo amplifier 5 scaling resistors. The pins 2 and 3 of the input terminal pt. Terminal 1, which are the devices, are connected, respectively, with the second inputs of the 16 and 17 differential amplifiers 10 JZ. Through the keys 29 and 32, the input of the device is 3 sredny with extreme, pins 26 and 27 are the second oryostivny divider sprei 25, which are identical with the input of the device 2 through the keys 30 and 31, with the first input 13 of the first differential amplifier 10 - che: re .34 and 35, and with the first inr -. / House 14 differential amplifier, 11, respectively) cut keys 33 and 36. The average output 4 of the input resistive divider is 1 connection with the interface with a six-differential 6th usi; - 5th line .a average output-28 .the second. resistivity; divider 25 napr - With the first entrance 15 re; tye-; GO: dyferetsyyalBydgche uYlyytesh 12, the input of which 18 is connected to the output J8 of the differential force. : tel 5, dvd and SMS exit. rRystva, the first output 23. block 22 of the commutations of the connectors with gapped by the inputs of the key 29–36, and the third: –withS 24.– with the control inputs of the differential amplifiers, outputs 1.9–21 of which are connected to the large-scale resistors 37–39. EZOTNOST is working as follows /. The main mode of operation is the half-sum of the input voltages. For this, the resistance of the resistive dividers of 1 and 25 Apr is chosen to be approximately equal (with accuracy, to the maximum from technical considerations). B: in the case of a B operation; Amplifier 5 is received by the unit; Approximately equal to the half-sum of the wedges of aprons (when the control circuit of the rest of the circuit is used). To correct the output of the nogo voltage, use the additional formula for a 2 5 apr w ary. Vho- rows 26 and 27 of this divider Pri.pomoschi poochereDyo pairwise key 29 unlocks, 31iZO, 32, kopFlUtyru eyH switching unit 22, connected to sootvetsztvenno alternately to the inputs 2 and 3 or (, sootvetstvenyo with vhOyami devices 2 and 3. In this case at Result of the 25-dA divider, voltages X / and Xgj fluctuate in patterns, with ideal keys 29 - 32, are equal to half the sum of the input voltages. jliaj with equal amplitude. with telegram 12, -i s respectively, in This sign is supplied through: a large-scale resistor 39 to the differential amplifier 5, if the output voltage is 5, If the output voltage is exactly equal to half the input voltage, the difference is equal to zero, so the output voltage of the differential amplifier is equal to zero equal to zero. q z - lf equalizer is also disrupted from the output 21 of the differential amplifier 12 through the masaitic resistor 39 receives a current, a slight deviation: ;; y from half-sum with a sufficiently large gain of the gains of the differential amplifier 12, this deviation may be significant. Tayloyu .uyu1ieyo (in / nekolYO tyy- with h times, similar to the drift of the ordinary operation oyusilizer). jBO is just as much as increasing. The accuracy of gag- / / duoLoi yoiuulmsma vkHdyyi i-SII. This is Rérav§; Liv6 with ideal, kly chy, yprymer in the case of yspol-. zvani; ek; yachestse; / keys 29 .-. 32 ... KoHTakTOl- pisne, and expiry of the dif-; power amplifier; 12: on. . CT1UkTU IF same in device ys-. use elda1 keys, nalrimer, on field effect transistors ,. their stz, for example, summing up with the input stresses, can ... pore errors. Definitions of semi-sum. In order to reduce this component error, the following devices were entered into the device circuit; two differential amplifiers lu and and 33 - 36 were also introduced. The keys 34 and 35 are controlled so that the first and second inputs 13 and 16 of the differential amplifier 10 are alternately connected in parallel with the open To this ment, the keys, 30 and 31, are connected to the Bxoiai 2 device. The alternating voltages arising alternately on the cry 30 and 31 are amplified by the differential amplifier 10 and, as a correction, are applied with the appropriate sign to: the mastic resistor 38 of the differential amplifier 5. The residual voltage of 29 and 32 is corrected using the keys 33 and 36 Differential Amplifier 11 and a Resistor 37. Choosing the appropriate values of the transfer coefficients and the signs of these corrections, you can safely avoid the influence of the octa "exact key voltages., .. Thus, in the main mode of Cereal allows op half the sum of the input voltage with an accuracy of a few thousands of times meiyney than the error resistive dividers 1 and 25 nagf voltage (practically up to 10%). Modes of precision summation of coefficients that are not equal to O, 5, MAY be obtained by ordinary methods, by using several devices that perform the operation of the half-time controller and the auxiliary devices of the 1X amplifiers. So, for example, accurate inversion can be obtained, in the form of implicit functions 5 "And, turning on the device 40, working in the half-number # 1 definition, into the feedback circuit of the operational amplifier 41, (see, Fig 2); 3 shows the use of a device 40 operating in p (also determining half-sum, and operating ZionOX amplification | 41 is a mode of double-voltage Negative foot; Using PbsleyGel and Parallel with six different modes of operating 40, working in a region and a field, and a surface area. 42 Invert) moat € 1 cm, f; 4): and doubling, you can produce a World with arbitrary coefficients, like 1 to a torus, as it is done in Digital Overscope (Fig. 4 shows p: RyM (EQ for precision sum 5 of 5), and for a total of 5). xj) Similarly to digital-to-analog converters, lower-range adders can be comparatively inaccurate and can be conventional adders, Operated devices for precision summation of 1 GU can be used

693388 are used as precision sources of the reference voltage of non-linear analog devices, analog-digital and digital-to-analog converters, as voltage sensors, and for calibrating precision analog-digital and digital-analog ones. converters .. The accuracy and stability of similar devices can be much higher than the accuracy and stability of resistive voltage dividers used in these circuits. With modern circuit elements, the accuracy of these devices can be reduced to a few levels; Alcrovolt, i.e. to about 0.0001% on a scale of 10 V. claim I, a device for summing signals containing a resistive divider; voltages whose extreme terminals i are device inputs and the middle lead is connected to a non-inverting input of a differential amplifier connected by an inverting input to one of the terminals of large-scale resistors and through The resistor is connected to its output, which is the output of the system, which contains, for the purpose of increasing the stability and accuracy of the work of the device, it contains an additional resistive divider, commutation unit, the first output of which is connected to the control inputs of four pairs of keys, and three additional differential amplifiers, the outputs of which are pdrredinen to others, the outputs of the corresponding scale relays of the HCTOJJOB, and the uglary inputs are connected to the second output of the block switches, which are connected to the second output of the unit's 3HCTOJJOB amplifiers. additional resistive voltage divider is connected. two pairs of keys are connected to the device inputs and through two other pairs of barbed to the first inputs of two sorts of additional differential levels or Tele, the second inputs are connected to the inputs of the receiver, the first input of this option is a differential amplifier; - connected to the average output of the additional resistive divider, and its second input is connected to the output of the device. Sources of information taken into account in examination 1, V. Smrlov, Analog Computation Machines, M., 1972, p. 143, 2. Help. Non-linear circuits. Under the tail, .L, Sheineld, M, Mir, 1977, p. 274 (prototype).

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