Four-order current type elliptical filter structure based on OTA-C

An elliptic filter and current-type technology, applied in CAD circuit design, electrical components, impedance networks, etc., can solve the problems of high energy consumption in voltage mode circuits, insufficient in-band selectivity, and inability to achieve electronic adjustment. Simple design process, good in-band selectivity, and easy engineering

Pending Publication Date: 2022-04-12
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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Problems solved by technology

[0006] The existing bioelectrical signal filter structure has the following disadvantages: (1) It is necessary to change the circuit topology to realize the functions of low-pass, high-pass, band-pass and band-stop filters; (2) the energy consump

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  • Four-order current type elliptical filter structure based on OTA-C
  • Four-order current type elliptical filter structure based on OTA-C
  • Four-order current type elliptical filter structure based on OTA-C

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Embodiment Construction

[0022] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings, so as to make the technical solution of the present invention easier to understand and grasp, but the embodiments of the present invention are not limited thereto without loss of generality. The embodiments described here are to help readers understand the principle of the present invention, readers can make various deformations and combinations without departing from the essence of the present invention according to these technical principles disclosed in the present invention, and these deformations and combinations are still protected by the present invention within range.

[0023] The structure of the fourth-order elliptic filter designed by the present invention is as follows: figure 1 shown, including two current signal input terminals I in , a current signal output terminal I′ out , four capacitors to ground C 1 、C 2 、C 3 、C 4 , s...

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Abstract

The invention belongs to the field of integrated circuit design, and relates to a four-order current type elliptical filter structure based on OTA-C. The filter is composed of four grounding capacitors and six single-ended input OTA, and comprises two current signal input ends Iin and a current signal output end I'out. From the perspective of mathematical derivation, an analytical synthesis method is adopted, and poles of the four-order current type elliptic filter are determined through a transfer function. And the frequency characteristic of the circuit can be changed only by changing various coefficient values of a circuit transfer function without changing the circuit topology, so that four filtering functions of low-pass, high-pass, band-pass and band-stop are realized respectively. As the OTA can adjust the transconductance value through the external bias current, the elliptical filter designed by the invention has good in-band selectivity and also can realize adjustable functions.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and in particular relates to an OTA-C-based fourth-order current type elliptic filter structure. Background technique [0002] In bioelectrical signal processing technology, filter is a very important module. The frequency of human bioelectrical signals is extremely low, and the frequency ranges of various signals overlap, such as ECG (0.05Hz-150Hz), EEG (0Hz-150Hz), EGG (0.05Hz-0.5Hz), ERG (0Hz-20Hz) etc., the selectivity requirements of the filter are very strict. Nowadays, electronic equipment tends to be miniaturized, how to realize highly selective and miniaturized filters is a current research hotspot. [0003] There are roughly three types of active filters in analog integrated circuits: RC filters, MOSFET-C filters and OTA-C filters. Due to the extremely low frequency of bioelectrical signals, a large RC is required and the absolute error of passive components is large, so that...

Claims

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Application Information

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IPC IPC(8): H03H17/02G06F30/32
Inventor 李大为肖光兴邓冬琴江小平
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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