SU1277399A1 - Device for converting sine signals to digital code - Google Patents

Abstract

The invention relates to automation and computing, in particular to analog-to-digital converters that provide communication between digital computers and devices that provide information in analog form. The aim of the invention is to expand the dynamic range and expand the functionality of the device. For this purpose, two quadrs, a source of reference voltages and a divider are entered into a device for converting sine signals into a code containing a selection selector, a voltage conversion unit into a code, an inverter and a summing amplifier. stress This goal is achieved by decomposing the suiet / o6 function in the Taylor series, which is used to extract the signal r in analog form and expands the dynamic range. (L 2 pe.

Description

The invention relates to automation and computing, in particular to analog-to-digital converters, providing communication of digital computers with devices that produce information in analog form.

The purpose of the invention is to expand the dynamic range and functionality of the device.

FIG. 1 shows a block diagram of a device for converting sine signals into a code; Figure 2 is a voltage divider circuit diagram.

The device for converting sinus signals into a code contains a selector of 1 octants, a block 2 converting voltage into a code, a voltage divider 3, quadrants 4 and 5, an inverter 6, a reference voltage source 7, a summing amplifier 8.

The divider 3 contains the operational amplifier 9, the multiplier 0 and the resistors P and 12, the summing amplifier 8 contains the operational amplifier 13 and the resistors 14-17.

The device works as follows.

The selector 1 generates an .signal proportional to the sine of the angle about within the first octant, which is fed to the measuring input of unit 2 and to the input (input of the divide) divider 3

 At the reference input unit 2 from the output of the amplifier 8 receives a signal, the amplitude of which with high accuracy

sinot

By

proportional to magnitude

oi

to this, the output code of block 2 is obtained proportional to the angle about within the first octant from the ratio of the voltages applied to its measuring and reference inputs.

Consider the process of forming the signal at the output of the amplifier 8.

Let X be the signal at the output of divider 3. Then the signal U, at the output of quad, 4, i.e. at the first input of amplifier 8, is determined

their

Considering that the signal U at the second input of amplifier 8 is formed by squaring using quad 5 and then inverting the signal U, inverter 6, we get

and ,,.

Source 7 produces a signal 1 of a single negative polarity level, which is fed to the third input of the amplifier 8.

The transmission coefficients for the first, second, and third inputs of amplifier 8 are selected equal to 1/6, 1/120. and 1 respectively. In view of this, the output signal and amplifier 8 will be determined

-sU; tu -.

When X i 90, taking into account the expansion of the function Sin X in a power series of the form

x x x

SinX X - - (-1) (2p; T)

without a big margin of error SinX

and

X

The signal X at the output of the divider 3 is formed by dividing and then inverting the signal Sin about its first input to the signal V at its second input divisible input coming from the output of amplifier 8

  Sin "c X - - --- ..

This operation is performed by establishing the equality of the current through the first resistor of the amplifier 9, formed by the signal Sin from the output of the selector 1, to the current through the second resistor of the amplifier 9, formed by the signal x and from the output of the multiplier 10.

Taking into account the implementation (l we get

X - o and §iS.

oi

The amplitude of the signal at the output of the amplifier 8, and consequently, at the reference input of the block 2 is proportional to

5 Sinof J and the amplitude of the output signal

divider 3, and consequently, at the second output of the device, is proportional to the angle “Thus, the device provides for receiving signals proportional to the angle of rotation both in digital (at the output of block 2) and in analog (at the output of divider H), with This ensures that the conversion accuracy is quite high when the angle θ changes within O-9 °.

Claims (1)

Invention Formula A device for converting sine signals into a code containing an octant selector, the output of which is connected to the first input of the voltage conversion unit, the code of which is a digital output of the device, a summing amplifier and an inverter, in order to extend the dynamic range and functional capabilities of the device, two quadres are introduced into it, the source of the reference voltage and the voltage divider, the first the input of which is connected to the output of the octant selector, the second input is connected to the output of the summing amplifier and is connected to the second input of the voltage conversion unit and the output is the analog output of the device and is connected via the first quad to the first input of the summing amplifier and the second quad input, the output of which connected via an inverter with a second input of a summing amplifier, the third input of which is connected to the output of the reference voltage source.