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High-linearity anti-aliasing filter with selectable cut-off frequency and level shift

An anti-aliasing filter, cut-off frequency technology, applied in amplifiers with semiconductor devices/discharge tubes, frequency-selective two-terminal pair networks, networks using active components, etc., can solve difficult signal linearity, NMOS tube requirements, low common-mode voltage and other issues

Pending Publication Date: 2022-06-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only that, but the common-mode voltage of the ADC is often very low, and it is difficult for most analog level shifting modules to guarantee the linearity of the signal during level shifting.
The main reason is that the common mode level is too close to the ground potential, and the requirements for the NMOS tube are too strict

Method used

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  • High-linearity anti-aliasing filter with selectable cut-off frequency and level shift
  • High-linearity anti-aliasing filter with selectable cut-off frequency and level shift
  • High-linearity anti-aliasing filter with selectable cut-off frequency and level shift

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Embodiment Construction

[0025] Below in conjunction with the accompanying drawings, the high-linearity anti-aliasing filter designed by the present invention with a selectable cut-off frequency and level shift will be further described.

[0026] The anti-aliasing filter of the present invention comprises a low-pass filter and a level shifting circuit, wherein the low-pass filter uses a multiple feedback structure. figure 2 The overall schematic diagram of the anti-aliasing filter with selectable cutoff frequency and level shift function, which includes a low-pass filter and a level-shift circuit, wherein the low-pass filter uses multiple feedback structures. Figure 3 shows the structure of multiple feedback filters, where resistors R1 and R2 determine the low-frequency closed-loop gain, and resistors R2, R3 and capacitors C1, C2 determine the cutoff frequency. When the resistance value of the resistor remains unchanged, it is only necessary to pass the switch The cutoff frequency can be adjusted b...

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Abstract

The invention belongs to the technical field of integrated circuits, and particularly relates to an anti-aliasing filter with level conversion and adjustable cut-off frequency. The circuit is composed of a second-order Butterworth low-pass filter and a level shift circuit. The second-order Butterworth low-pass filter is composed of an active amplifier and a peripheral second-order RC network and is provided with a CMOS switch for cut-off frequency switching. The level shift circuit is composed of a high-voltage grid voltage bootstrapped switch and a sampling capacitor, and is matched with a capacitor array of a post-stage analog-to-digital converter to realize a level shift function. Wherein the high-performance amplifier provides guarantee for realizing a low-noise and high-linearity signal transmission function, and the grid voltage bootstrapped switch and the capacitor realize low-power-consumption level shift.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a high linearity anti-aliasing filter with selectable cutoff frequency and level shift. Background technique [0002] With the continuous development of the communication field, digital signals have better anti-interference ability than analog signals, and can be processed more conveniently. However, the signals in nature are all analog signals, and it is difficult for digital systems to directly process analog signals. The analog-to-digital converter can convert analog signals into digital signals, and the analog-to-digital converter requires the corresponding analog front end to match, such as figure 1 shown. The signal in nature first enters the analog front end. Taking a common system as an example, the signal is first amplified by a low noise amplifier (LNA), then passed through a programmable amplifier (PGA), and finally passed through an anti-alia...

Claims

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Application Information

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IPC IPC(8): H03H11/12H03F3/45
CPCH03H11/1213H03F3/45179
Inventor 叶凡池浩任俊彦许俊马顺利
Owner FUDAN UNIV