JPS5835671A - Analog signal processing device - Google Patents

Abstract

PURPOSE:To make parts such as a variable resistor unnecessary to improve the reliability of the device, by performing the comparison for the zero level and the span level in a reference voltage and current generator and a comparator adjust A/D and D/A converters by the data processing device. CONSTITUTION:The output terminal of a D/A converter 5 having a data storage circuit 8 is connected to a voltage comparator 6 and an A/D converter 2 having a data storage circuit 7. A data processing device 3 is connected to the input side of the converter 5, and the digital signal from the device 3 is converted to an analog signal. The output of a reference voltage and current generator 1 is applied to the comparator 6, and the output of the generator 1 and the analog output from the converter 5 are compared operated in this comparator 6, and the operation result is applied to the device 3. Until the output signal indicating the coincidence detection is obtained from the comparator 6 in the device 3 in respect to the zero level and the span level, the digital output is fed back and is outputted as correction data to devices 7 and 8. By this constitution, a variable resistance or the like is unnecessary, and the reliability of the processing device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an analog signal processing device fjlfc.

Conventionally, when converting analog signals to digital signals,
As shown in FIG. 1 (1), the Ov and span of the warehouse were manually adjusted using an A/D converter. In this case, the data input to the data tin salt device is always the same value, but it takes a lot of time to adjust because the analog circuit requires precision, and the adjustment is slow because the data varies from person to person. Ta.

In addition, as shown in Figure 1(b), a D/A converter was used to convert a digital signal to an analog signal, and the adjustment was done manually, so it is similar to the A/D converter described above. There was a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an analog signal processing device that reduces adjustment time and eliminates variations in process adjustment due to individual differences.

Another purpose is to improve reliability by eliminating analog adjustment parts such as variable resistors; 11. II An analog signal processing device that can be automated by reducing equipment.

This is what we provide.

The main feature of the present invention is to compare the zero level and span level between the reference voltage and current generator and the comparisons 2 to 2, and adjust the A/D converter and D/A converter by the data processing device.

As the adjustment data, correction data from the data processing device is stored in the data storage circuits of the A/D converter and the D/A converter, and the signal is processed.

Hereinafter, the present invention will be described in detail with reference to illustrative embodiments.

Configuration> The output end of the D/Af converter 5 having the data storage circuit 8 is connected to the comparator 6 and the A/D converter 2. This D/
A data processing device 3 is connected to the input end of the A converter 5, and the digital signal from the data processing device 13 is converted into a D/
D/A conversion is performed in A conversion 'a5.

A reference voltage and current generator 1 is connected to the comparator 6, and a comparison operation is performed between the output of the reference voltage and current generator 1 and the analog output of the D/A converter 5'. The output of the comparator 6 is configured to output to the data processing device 3 a signal indicating the magnitude relationship between the output set by the reference voltage current generator 1 and the analog output of the D/A converter 5, or a signal indicating the detection of a scattered state. ing.

Therefore, the data processing device 3 feedback-controls the digital output for the zero level and the span level until the comparator 6 outputs a signal indicating a coincidence state detection.

On the other hand, the analog output of the D/A converter 5 is input.
l) The converter 42 has a data recording circuit 7 similar to the D/A converter 5. This A/D converter 2 is equipped with an external analog power av, and this external analog power a or D/
The analog input yh/DK of the A converter 5 is output to the data processing device 3.

The data processing device 3 compares the voltage with the A/D converter 2, ≦6
σ) output as an input signal, and outputs digital No. 15 to the D/A converter 5 and correction data to the data storage circuit 7.8. Furthermore, the data processing device 3 has an external digital output for outputting digital signals to the outside.

When an analog signal is input from external analog human power a,
/D converter 2 outputs a digital signal to data processing device 3. Data processing device 3 that receives this digital signal
holds that value as an initial value and outputs it to the D/A converter 5&C.

The D/A converter 5 converts the digital input into D/Afi and outputs an analog signal to the voltage comparator 6 and the A/D converter 2. The voltage comparator 6 inputting the analog signal from the D/A converter 5 compares it with the set value set by the reference voltage and current generator IK, and outputs a deviation signal to the data processing device.

On the other hand, the A/D converter 2 A/D converts the analog output of the D/A converter 5 again and outputs it to the data processing device 3. Therefore, the data processing device 3 uses this digital output, the digital output initial value of the A/D converter 2, and the comparator 6.
Comparison calculation is performed with the deviation signal of The data processing device 3 uses this comparison calculation value as correction data, and uses the data storage circuit 7.
8 respectively.

In this way, the A/D converter 2 and the D/A converter 5 operate on the correction data in the data storage circuit 7.8, process the signal from the external analog input a, and output the external digital signal. .

Next, we will explain using a simplified numerical model.

The reference voltage is set to 5V by the base voltage/current generator 1, and digital data is output from the data processing device 3 to the D/A converter 5. When comparator 6 detects a matching state, 0° de
~ The data is set to 8400, and the analog signal at this time is converted to A/DK by A/D converter 2, and the digital data is set to 8200. The digital chitake 220 (set to 1) is set and output to the data processing device 3/A converter 5. Uniformly, the A/D converter 2 outputs the
The D-converted digital data is 1800. This is Ic-C)'=ax+b a==1500.

b=701: is obtained. The values of a and b can be used as correction data, and the values of 8400 and 2200 can also be used as correction data.
All you have to do is output 4450.

A/Dim 48200 1800! D, I
= 1600.

If b = 2 (10 t; l) and the A/D conversion value is 5960, this means an analog input signal of 3.6 V.

The A/D converter 2 and its data storage circuit 7 can be separated from the data processing device and connected to other data processing devices. At that time, the connected data processing device is the data storage circuit 7
E9: Be able to take the correction data and process analog signals through calculations. Similarly, the D/A converter 5 and data storage circuit 8 can also be connected to other data processing devices.

Furthermore, the reference voltage and current generator 1 and the voltage comparator 6 can be included in the device to constantly correct data processing in the data processing device Jl.

Alternatively, it may be an integrated circuit in which the A/D converter 2 and the data storage circuit 7 are integrated. The same applies to the D/A converter 5 and the data storage circuit 8. <Effects> The analog signal processing device according to the present invention is as described above, and can achieve the following effects. , parts such as variable resistors were required, and adjustments were made manually, resulting in many setting errors. In contrast to analog correction, in the present invention, a digital correction signal is stored in a data storage circuit provided in each of the A/DK converter and the D/A converter, and correction is performed using this digital data.

Therefore, the accuracy of correction is significantly improved and automation can be achieved.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram showing a conventional example of an A/D converter, FIG. 1(b) is a block diagram of a D/A converter as well, and the second factor is a block diagram showing a conventional example of an A/D converter. It is a block diagram. 1... Reference voltage current generator, 2... Mu/D converter,
3... Data processing device, 4... Voltage and current needle, 5...
・D/AK converter, 6... Voltage comparator, 7... Data storage circuit, 8... Data storage circuit, 9... Mu/D conversion device, 10... D/Ai conversion device , a... External analog input, b... External digital output.

Claims (1)

[Claims] an A/D converter with external analog input and memory;
A D/A converter having a memory and outputting an analog signal to the A/D converter, a reference voltage and current generator, and an output of the reference voltage and current generator and an analog output of the D/A converter. It has a voltage comparator for comparison and an external digital output, inputs the digital output of the A/D converter and a comparison value of the voltage comparator, and outputs a digital signal to the D/A converter, An analog signal processing device 0 characterized in that it is equipped with a data processing device that outputs each of the memo IJK correction data.