TIADC system DC bias and gain error calibration method and device

A technology of DC bias and gain error, which is applied in the field of communication, can solve the problem of not modifying the structure, achieve the effect of accurate and simple calibration process, simplify the calibration system, and expand the range of variation

Pending Publication Date: 2020-12-15
BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] On this basis, the present invention proposes a more accurate improvement to the TIADC DC bias and gain error calibration method, but does not modify the structure

Method used

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  • TIADC system DC bias and gain error calibration method and device
  • TIADC system DC bias and gain error calibration method and device
  • TIADC system DC bias and gain error calibration method and device

Examples

Experimental program
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Embodiment 1

[0080] In this embodiment, the multi-channel TIADC system takes 16 channels as an example, and the principle diagram of error calibration is shown in figure 2 , specifically use the digital domain design state machine to control the input signal, such as image 3 as shown,

[0081] S101. Connect the input end of the 16-channel TIADC system to the first DC calibration signal DC1;

[0082] Sampling the first DC calibration signal for 128 cycles, and calculating the first sampling mean value of the i-th channel according to the 128 sampling values;

[0083] Sampling the second DC calibration signal for 128 cycles, and calculating the second sampling mean value of the i-th channel according to the 128 sampling values;

[0084] After using the sampling module (ADC) to record 128 sampling values, calculate the first sampling average value V of the i-th channel 1 (i) and stored in the storage unit (store), return to input the second DC calibration signal DC2, use the sampling mod...

Embodiment 2

[0093] This embodiment takes 16 channels as an example to illustrate the TIADC system DC bias and gain error calibration device, such as Figure 4 shown, including:

[0094] 310 internal calibration signal source for DC bias and gain error calibration of the system;

[0095] The internal calibration signal source includes: a first DC calibration signal 311 and a second DC calibration signal 312;

[0096] The sampling module 320 is used to obtain at least two periodic sampling values ​​under the channel working signal, the first DC calibration signal and the second DC calibration signal;

[0097] Specifically, 128 sampling values ​​of the first DC calibration signal of each channel of the 16 channels are obtained, and 128 sampling values ​​of the second DC calibration signal of each channel of the 16 channels are obtained; each channel of the 16 channels under the working signal is obtained The sampling data Vo(i);

[0098] The calibration module 330 includes a calculation u...

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Abstract

The invention discloses a multi-channel TIADC system DC bias and gain error calibration method and device, and the method comprises the steps: obtaining at least two periodic sampling values of each channel under a first DC signal source, and calculating the average value of the first sampling values; acquiring at least two periodic sampling values of each channel under a second direct-current signal source, and calculating an average value of the second sampling values; and according to the first sampling value average value and the second sampling value average value, performing DC bias andgain error calibration on the sampling data of the lower channel of the working signal. According to the improved TIADC analog self-calibration system provided by the invention, two paths of direct-current calibration signals and the calibration model are utilized to calibrate input signals during normal work, so that the calibration system is simplified, and meanwhile, the calibration result is more accurate.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a method and a device for calibrating DC bias errors and gain errors of a TIADC system. Background technique [0002] High-speed ADC (Analog-to-Digital Converter) is a key component of high-performance signal processing systems, and it is used in complex systems such as large-bandwidth communication systems, instrumentation, and radar. TIADC (time-sharing alternate analog-to-digital converter) technology can improve the sampling speed of the system while maintaining the sampling accuracy. There are three main mismatches in the TIADC system: DC offset error (offset mismatch), gain error (gain mismatch) and Sampling time error (timing mismatch). [0003] In the prior art, the multi-channel TIADC system calibrates the DC offset offset and the gain error gain as follows: switch the state machine to the first DC calibration signal DC1, and record N sampling values ​​of each chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
CPCH03M1/1028
Inventor 杨浩
Owner BEIJING NUFRONT MOBILE MULTIMEDIA TECH
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