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Adaptive calibration circuit and method

A calibration circuit and self-adaptive technology, applied in the direction of self-adaptive network, electrical components, impedance network, etc., can solve the problems of inconsistent filter characteristics, capacitance and resistance deviation, and increased production cost.

Pending Publication Date: 2018-12-11
SHENZHEN BLUETRUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally speaking, integrated circuits have been widely used in various electronic products. Among them, due to deviations in the production process and working conditions during the manufacturing process of chips, there may be certain deviations in the capacitance and resistance in the circuit, which in turn leads to circuit performance. inconsistent with design
Especially in integrated analog filter circuits, this deviation may lead to inconsistent filtering characteristics of the filter, thus affecting the consistency of mass production. In order to solve this problem, an external measurement matching circuit or compensation circuit can be added to maintain consistency, but Will increase the cost of measurement, resulting in an increase in the overall production cost

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] see figure 1 , figure 1 is a schematic block diagram of an adaptive calibration circuit provided by Embodiment 1 of the present invention. The adaptive calibration circuit 100 includes a control module 110 , a signal generation module 120 , a digital-to-analog conversion module 130 and a filter module 140 . Wherein, the control circuit 110 , the signal generation module 120 , the digital-to-analog conversion module 130 and the filtering module 140 can be arranged in the same integrated circuit.

[0062] The control module 110 is configured to send a control signal to the signal generation module 120, for example, the control module 110 may be a central processing unit (CPU, center processor unit). The signal generating module 120 is electrically connected to the control module 110 . The signal generation module 120 receives the control signal transmitted by the control module 110 . The signal generation module 120 generates a sine wave signal with a specific frequen...

Embodiment 2

[0066] see figure 2 , figure 2 is a schematic block diagram of an adaptive calibration circuit provided by Embodiment 2 of the present invention. The adaptive calibration circuit 200 includes a control module 210 , a signal generation module 220 , a digital-to-analog conversion module 230 , a filter module 240 , a function module 250 and a first adder 260 . For the control module 210 , the signal generation module 220 and the digital-to-analog conversion module 230 , please refer to the description of Embodiment 1, and details are not repeated here. The filter module 240 includes a filter 241 , an analog-to-digital conversion module 243 and an energy calculation module 245 .

[0067] The first adder 260 is electrically connected to the function module 250 , the digital-to-analog conversion module 230 and the filter module 240 . For example, the function module 250 can be used to switch the adaptive calibration circuit 200 in the initialization mode or the calibration mode...

Embodiment 3

[0073] see image 3 , image 3is a schematic block diagram of the energy calculation module of the adaptive calibration circuit provided by Embodiment 3 of the present invention. The energy calculation module 345 includes a multiplier 345a, a second adder 345b and a divider 345c. The second adder 345b is electrically connected to the multiplier 345a and the divider 345c. The multiplier 345a is used for multiplying the digital excitation signal. The second adder 345b performs addition operation on the digital excitation signal. The divider 345c divides the digital excitation signal. The divider 345c outputs a root-mean-square signal (RMS) to a control module (not shown). The energy calculation module 345 can use the following formula:

[0074]

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PUM

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Abstract

The invention provides an adaptive calibration circuit, comprising a control module, a signal generation module, a digital-to-analog conversion module and a filter module. The signal generation modulereceives the control signal transmitted by the control module and generates a sine wave signal. The digital-to-analog conversion module receives the sine wave signal transmitted by the signal generation module and generates an excitation signal. The filter module receives the excitation signal transmitted by the digital-to-analog conversion module and generates a root mean square signal. The control module receives the root mean square signal transmitted by the filter module and generates a root mean square proportional signal. The control module adjusts the capacitance value of the filter module according to the capacitance control signal generated by the square root-mean-square proportional signal. The adaptive calibration circuit provided by the invention can adjust the capacitance value of the filter module by the control module to iteratively approach the preset frequency response value repeatedly, thereby effectively increasing the accuracy of calibration and solving the deviation of chip manufacture and production.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an adaptive calibration circuit and method. Background technique [0002] Generally speaking, integrated circuits have been widely used in various electronic products. Among them, due to deviations in the production process and working conditions during the manufacturing process of chips, there may be certain deviations in the capacitance and resistance in the circuit, which in turn leads to circuit performance. Not as designed. Especially in integrated analog filter circuits, this deviation may lead to inconsistent filtering characteristics of the filter, thus affecting the consistency of mass production. In order to solve this problem, an external measurement matching circuit or compensation circuit can be added to maintain consistency, but Will increase the measurement cost, resulting in an increase in the overall production cost. Therefore, using the self-built test calib...

Claims

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Application Information

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IPC IPC(8): H03H21/00
CPCH03H21/0012
Inventor 芦文李健勋张敏
Owner SHENZHEN BLUETRUM TECH CO LTD