SU1101843A1 - Multiplication device - Google Patents

Description

The invention relates to electrical computing devices and can be used in analogue and numeral machines.

A multiplication device containing discrete-controlled impedances and an operational amplifier 1 3 is known.

However, this device is characterized by low accuracy.

The closest to the proposed invention is a multiplication device containing a digital-to-analog converter first. The output of which is connected to the output of the first operational amplifier and is the output of the device, the inverting input of the first operational amplifier is connected to the second output of the digital-analog converter and connected to the first large-scale resistor the output of the second operational amplifier, between the inverting input and the output of which the second large-scale resistor is connected, the third output of the digital The tax converter is connected to the inverting input of the second operational amplifier, the non-inverting input of which and the non-inverting input of the first operational amplifier are connected to the zero potential bus, the analog input and the digital input of the diffraction analogue converter are C2J.

The disadvantages of the known device are the low accuracy, due to the resolution of the digital-to-analog converter, and the reception of a signal of a product of only one sign.

The aim of the invention is to improve the accuracy and expand the range of the product signal due to the possibility of obtaining it with different signs.

For this purpose, a first and second operational amplifiers comprising a digital-to-analog converter, a multiplier; The first and second large-scale resistors, the output of the first operational amplifier is connected to the output of a digital-to-analog converter voltage, the first current output of which is connected to the zero potential bus, the output of the first operational amplifier is the output of the device, the inverting input of the first one; Usnlt-S.p. is connected to the second current output of the digital-to-analogue converter and through the first scale {1st resistor - to the output of the second operational amplifier, the second masigtable resistor is connected between the inverting m input and output of the second operational amplifier, the non-inverting inputs of the first and second operational amplifiers are connected to the zero potential bus, the reference input of the digital-to-analog converter is an input of the analog signal-multiplier, an additional digital-to-analog converter, the element of the digital-to-analog converter are entered connected to the reference input of an additional digital-to-analog converter, the first current output of which is connected to the external the rotary input of the second operational amplifier, the inverted current input of which is connected to the second PBT unit; the first information input of the multiplexer is a significant input of the digital multiplier and is connected With the NOT input, whose output is connected to the second information input of the multiplexer, the control input of the multiplexer is the control input of the device, the output of the multiplexer is connected to the control input of the demultiplexer.

Fig. 1 shows a functional diagram of the device i in Fig. 2, a diagram of an embodiment of a demultiplexer.

The device contains (Fig.1) digital-to-analogue converter 1, first and second operational amplifiers 2 nZ, first and second large-scale re-eastors 4 and 5, Vicode 6, input of analog signal-multiplier 7, demultiplexer 8, additional digital-analogue converter 9, element 10, multiplexer 11, input of digital signal-multiplier 12, sign input of digital signal-multiplier 13, control input 14, width of zero potential 15. Figure 1 denotes the inputs of the demultiplexer 12, 12, ..., 12,., the first group of elements AND I6 (j, 16., ..., iDj is the second group of elements And 17d, 1 /, ... 17, element 18, control input 1, first outputs 20, 21, ..., 20, second outputs 21o, 21d, ..., 21j,. As a D / A converter In the proposed multiplication device, a known digital-to-analog converter can be used.The principle of operation of the multiplication device is as follows: The first multiplier in the form of an analog voltage is applied to the input of the analog signal-multiplier 7 (J. The input of the digital signal factor 12 enters the mantissa of the t-bit binary code of the second factor Y and the sign input of the digital signal factor 13 receives the sign code of the second factor - Zn Y. Zn, together with mu, forms the full digital (rt +1) -digit Binary code of the second multiplier M Zn Y, rri Inversion / direct (O / n) signal is applied to control input 1A. If and / and O, then the ZNU code passes through the multiplexer t1 without changing. The output signal of the multiplexer 11 controls the operation of the demultiplexer 8. When the sign code is equal to 0, the first output of the demultiplexer 8 forms zeros in all digits of the digital code which is fed to the digital input 11 3 of the digital-to-analog converter 1 and locks it. The first factor to output 6 passes through the open additional digital-analog converter 9, multiplying by the module b, and the first and second operational amplifiers 2 and 3, i.e. with Zn Y O, the sign of the analog multiplier signal is not inverted. In ZnU 1, the additional digital-to-analog converter 9 is closed, and the diffracted-analog converter is opened 1 and the analog signal-factor is passed to output 6 via the digital-to-analog converter, multiplying by the TPU module and the first operational amplifier 2, i.e. the sign is inverted. Consequently, the proposed device implements the equation UBb, xV- {2 - Uc but with doubled accuracy, since the mantissa of the second signal-multiplier contains n bits and not (n -1) as in the known device. If and / n 1, then the sign code passes through the element NOT 10. In this case, the equation is realized. tJBb, x (V) - (1 Thus, compared with the well-known device, the proposed device for the multiplier has a higher accuracy and a wider output output signal range.

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Claims (1)

(47) A MOBILE DEVICE containing a digital-to-analog conversion. the driver, the first and second operational amplifiers, the first and second scale resistors, the output of the first operational amplifier is connected to the voltage output of the digital-to-analog converter, the first current output, which is connected to the zero potential potential, the output of the first operational amplifier is the output of the device, the inversion input of the first operational amplifier connected to the second current output of the digital-to-analog converter and through the first scale resistor to the output of the second operational amplifier, the second scale a tab resistor is connected between the inverting input and the output of the second operational amplifier, the non-inverting inputs of the first and second operational amplifiers are connected to the zero potential bus, the reference input of the digital-to-analog converter is an input of an analogue signal-multiplier, characterized in that, in order to increase accuracy and expansion range of the product signal, a demultiplexer, an additional digital-to-analog converter, an element NOT and a multiplexer are introduced into it, and the reference input of the digital-to-analog the converter is connected to the reference input of an additional digital-to-analog converter, the first current output of which is connected to the non-inverting input of the second operational amplifier, the inverting input of which is connected to the second e the current output of the additional digital-to-analog converter, the information input of the demultiplexer is a multiplier, the first and second inputs are connected to the digital signals of the multiplexer with the digital inputs of the digital-to-analog converter and the additional digital-to-analog converter ('browser _{x the} first information input of the multiplexer is a sign input of the digital signal of the digital signal and connected to the input of the element NOT, the output of which is connected to the second information input of the multiplexer, directs multiplexer input is a control input of the output multiplexer unit connected to the control input of the demultiplexer.