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Cascaded integrator-comb filter with fast settling time and its design method

A settling time and filter technology, applied in electrical components, digital technology networks, impedance networks, etc., can solve the problems of short settling time and loss of accuracy, and achieve the effect of achieving consistent gain and shortening settling time.

Active Publication Date: 2019-02-22
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] High-speed CIC filters have shorter settling times than low-speed CIC filters, although accuracy is lost

Method used

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  • Cascaded integrator-comb filter with fast settling time and its design method
  • Cascaded integrator-comb filter with fast settling time and its design method
  • Cascaded integrator-comb filter with fast settling time and its design method

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Embodiment Construction

[0024] The present invention is made up of digital control module 1, high and low speed CIC filter 2, and overall circuit block diagram is as follows figure 1 shown.

[0025] The input signals of the digital control module 1 are various system parameters, including power-on reset and exit power-down, output data rate, channel gain, input channel and so on. When any system parameter changes, set the selection signal SEL[1:0]=2'b00, and add 1 to the value of SEL[1:0] every time the output data clock comes, until SEL[1:0]=2' b11.

[0026] figure 2 It is a block diagram of the CIC filter structure, mainly composed of the integrator (1 / (1-z -1 )) L , downsampling switch and differentiator (1-z -1 ) L Composition, where X(z) is the output signal of the Σ-Δ modulator, Y(z) is the output signal of the CIC filter, L indicates the order of the CIC filter, and R indicates that if the operating frequency of the integrator is F S , then the operating frequency of the differentiator...

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Abstract

The invention discloses a cascading integration comb filter with quick building time, and a design method for the cascading integration comb filter, and relates to a digital filter. The filter comprises a digital control module which is mainly used for monitoring system parameters, wherein the system parameters comprises but are not limited to a power-on reset and power-off enabling parameter, an output data rate, an input channel and a channel gain, and serve as control signals which can be quickly recovered. The filter also comprises a high-low speed CIC filter which is mainly used for converting a high-speed low-precision bit stream outputted by a front-end analog sigma-delta modulator into a low-speed high-precision digital signal for output. The input end of the high-low speed CIC filter is connected with the output end of the front-end analog sigma-delta modulator, and the output end of the high-low speed CIC filter outputs the low-speed high-precision digital signal. A control signal input end of the high-low speed CIC filter is connected with an enabling quick recovery control signal output end of the digital control module.

Description

technical field [0001] The present invention relates to a digital filter, in particular to a cascaded integral comb (CIC: Cascaded Integrator Comb) filter with fast settling time and a design method thereof. Background technique [0002] The Σ-Δ ADC is mainly composed of an analog Σ-Δ modulator and a digital down-frequency filter. The digital down-frequency filter usually uses a CIC filter. The higher the order of the CIC filter, the longer its settling time. For example, the literature [1] "Low-Noise 24-bitDelta Sigma ADC: ISL26132, ISL26134" (Intersil Corporation, 2014.12) uses a third-order Σ-Δ modulator and a fourth-order CIC filter, and the settling time is four output data cycles; the literature [2] "24-Bit Analog-to-Digital Converter For Bridge Sensors: ADS1231" (TEXAS INSTRUMENTS Corporation, 2010.12) uses a third-order sigma-delta modulator and a fourth-order CIC filter with a settling time of four output data cycles; Literature [3] "CS1232 User Manual" (Chipsea Te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
CPCH03H17/0201H03H2017/0204
Inventor 郭东辉林超
Owner XIAMEN UNIV