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Correction device for filter time constant

A technology of time constant and correction device, which is applied in the direction of stable output and electrical components, can solve the problems of slow correction speed, high power consumption, and complicated correction circuit, and achieve the effects of increasing speed, reducing power consumption, and shortening correction time

Inactive Publication Date: 2011-12-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing correction technology, the correction circuit is too complicated, the correction speed is slow, and the power consumption is too high.

Method used

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  • Correction device for filter time constant
  • Correction device for filter time constant
  • Correction device for filter time constant

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] The present invention proposes a "one-step" correction device for filter time constant, its structure is as follows figure 1 shown, including:

[0027] An analog module, used to calculate the product RC of the resistance to be corrected and the capacitance, and obtain a signal indicating the amount of the RC product, the analog module includes a charging circuit and a comparator for charging the capacitance to be corrected;

[0028] A digital module, the digital module includes a counter for obtaining the digital code indicating the RC product amount, and a digital circuit for "one-step" calculation of the correction code, the digital module is electrically connected ...

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Abstract

The invention discloses a filter time constant correction device, which relates to the technical field of on-chip filters, comprising: an analog module for calculating the time constant RC of the filter, that is, the resistance R of the filter to be corrected and the resistance to be corrected correcting the product of the capacitor C, and obtaining a signal indicating the RC product, the capacitor to be corrected is formed by a plurality of other capacitors connected in series; a digital module is electrically connected to the analog module, and is used to receive the analog module The signal indicating the amount of RC product is sent out, and the digital code indicating the amount of RC product is obtained by counting according to the signal, and then the corrected capacitance control code is calculated according to the digital code to control each capacitance of the filter, that is, the another capacitor. The invention improves the correction speed and reduces power consumption.

Description

technical field [0001] The invention relates to the technical field of on-chip filters, in particular to a device for correcting filter time constants. Background technique [0002] Since the active RC filter does not require an integrated inductance coil on the chip, it is a filter structure that is easy to achieve high integration. With the advancement of CMOS technology, the active RC filter can work in an increasing frequency band, the working voltage is continuously decreasing, and the power consumption is getting smaller and smaller. It is widely used in high-performance, low-to-medium speed analog RF circuits. However, the relative error of capacitance and resistance in the active RC filter has not been reduced. Under the current mainstream 0.18 micron CMOS process, the metal-insulator-metal capacitance error is 15%, while the resistance error is as high as 30%. This error greatly affects the frequency transfer characteristics of the active RC filter. [0003] The f...

Claims

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Application Information

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IPC IPC(8): H03L1/00
Inventor 陈涛赵博杨华中
Owner TSINGHUA UNIV