Unlock instant, AI-driven research and patent intelligence for your innovation.

An analog-to-digital conversion circuit

An analog-to-digital conversion circuit and modulation circuit technology, applied in the direction of analog-to-digital conversion, code conversion, electrical components, etc., can solve the problems of digital decimator filtering, the effect of analog-to-digital conversion results, and the accuracy of signal reading.

Active Publication Date: 2019-07-12
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the integral module includes an operational amplifier, the low-frequency noise and offset voltage generated by the operational amplifier are close to the frequency of the desired useful signal and cannot be filtered out by the digital decimator, which will affect the result of the analog-to-digital conversion
Moreover, when the analog-to-digital converter is used to read weak signals output by devices such as sensors, the low-frequency noise and offset voltage will seriously affect the accuracy of signal reading

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An analog-to-digital conversion circuit
  • An analog-to-digital conversion circuit
  • An analog-to-digital conversion circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] see figure 2 , which is a schematic diagram of Embodiment 1 of the analog-to-digital conversion circuit provided by the present invention.

[0090] The analog-to-digital conversion circuit provided in this embodiment includes: a modulation circuit 100;

[0091] The modulation circuit 100 includes: a first chopper 101, a second chopper 103, a third chopper 103, a fourth chopper 104 and an analog-to-digital converter 105;

[0092] It can be understood that the analog-to-digital converter 105 can be any kind of analog-to-digital converter, for example, Sigma-DeltaADC.

[0093] The input terminal of the first chopper 101 is connected to an analog signal, the output terminal of the first chopper 101 is connected to the input terminal of the second chopper 102, and the control terminal of the first chopper 101 Connect the first chopping signal

[0094] The output terminal of the second chopper 102 is connected to the input terminal of the analog-to-digital converter 105...

Embodiment 2

[0106] Referring to FIG. 3( a ), this figure is a schematic diagram of Embodiment 2 of the analog-to-digital conversion circuit provided by the present invention. Compared to figure 2 , this embodiment provides a more specific implementation structure of an analog-to-digital conversion circuit.

[0107] In order to more effectively filter out noise and misalignment in digital signals and reduce requirements on the performance of the signal extractor, the modulation circuit 100 provided in this embodiment further includes: a first filter 106;

[0108] The input end of the first filter 106 is connected to the output end of the third chopper 103 , and the second end of the first filter 106 is connected to the input end of the fourth chopper 104 .

[0109] It should be noted that in the digital code stream output by the analog-to-digital converter 105 , useful signals are located in the high frequency band, and interference factors such as quantization noise, low frequency noise...

Embodiment 3

[0175] see Image 6 , which is a schematic diagram of Embodiment 3 of the analog-to-digital conversion circuit provided by the present invention. Compared to figure 2 , this embodiment provides a more specific implementation structure of an analog-to-digital conversion circuit.

[0176] In the analog-to-digital conversion circuit provided in this embodiment, the analog-to-digital converter 105 is configured to sample the output signal of the second chopper 102 at a first sampling frequency fs1;

[0177] The first sampling frequency fs1≥2*fmax, where fmax is the maximum frequency of the analog signal.

[0178] It can be understood that the analog-to-digital converter 105 generally uses a frequency much higher than the Nyquist sampling frequency to sample the analog signal, that is, over-sampling, so as to improve the signal-to-noise ratio of the output digital signal. The first sampling frequency fs1=M*2fmax, the value of M is generally between 8-256, which can be selected ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An embodiment of the invention discloses an analog to digital conversion circuit comprising a modulation circuit. The modulation circuit comprises a first chopper, a second chopper, a third chopper, a fourth chopper and an analog-to-digital converter. Analog signals are connected with an input end of the analog-to-digital converter via the first chopper and the second chopper, an output end of the analog-to-digital converter is connected with an input end of a signal extractor via the third chopper and the fourth chopper, control ends of the first chopper and the fourth chopper are connected with first chopping signals, control ends of the second chopper and the third chopper are connected with second chopping signals, and the first chopping signals are lower than the second chopping signals in frequency. The analog to digital conversion circuit provided in the invention can reduce effects exerted on analog-to-digital conversion by low frequency noise and offset voltage produced by an operational amplifier in the analog-to-digital converter, signal to noise ratios of processed signals can be improved, and precision of a signal processing system can be raised.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an analog-to-digital conversion circuit. Background technique [0002] With the development of communication technology and integrated circuit technology, analog-to-digital conversion technology develops rapidly. Among many types of analog-to-digital converters (ADC, Analog to Digital Converter), the Sigma-Delta ADC circuit can achieve high precision and good noise suppression performance without strict on-chip device matching. [0003] The existing Sigma-Delta ADC circuit design is mainly composed of a Sigma-Delta modulator and a digital decimator. Coupled with the anti-aliasing filter at the front end of the Sigma-Delta modulator, a complete Sigma-Delta ADC circuit structure is formed. see figure 1 , which is a structural diagram of a Sigma-Delta ADC in the prior art. Existing Sigma-Delta ADCs include: anti-aliasing filter, Sigma-Delta modulator and digital deci...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/06H03M1/54
CPCH03M1/0665H03M1/54
Inventor 何青王玮冰李佳
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI