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Dual-mode active filter circuit with adjustable bandwidth

A source filter, dual-mode technology, applied in the field of dual-mode active filter circuits, can solve the problems of multi-chip area, low operating frequency, occupation, etc., to save costs, achieve isolation, and save chip area.

Active Publication Date: 2014-10-22
WUXI ZHONGKE MICROELECTRONICS IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] There is an intermediate frequency filter in both the receiving chain and the transmitting chain. Due to the low operating frequency, the two filter circuits will occupy more chip area.

Method used

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  • Dual-mode active filter circuit with adjustable bandwidth
  • Dual-mode active filter circuit with adjustable bandwidth
  • Dual-mode active filter circuit with adjustable bandwidth

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with drawings and embodiments.

[0028] The dual-mode active filter circuit with adjustable bandwidth proposed by the present invention, such as figure 1 shown. The circuit is based on the traditional first-order low-pass filter structure. A third-order low-pass filter circuit is formed by cascading three stages. Two third-order low-pass filters are connected through a multi-resistor network to form a complex filter circuit. , that is, the complex filter is composed of two low-pass filters and a multi-resistor network. When the multi-resistor network is controlled to be turned on and off, the switching between the complex filter and the low-pass filter circuit is realized.

[0029] In the short-distance wireless transceiver chip, the complex filter is used in the receiving link to suppress the image signal, and the low-pass filter is used in the transmitting link to suppress the clock interference signa...

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Abstract

The invention provides a double-mode type active power filter circuit with an adjustable bandwidth. The filter circuit can be configured to be at two modes of a complex band-pass filter and a low-pass filter which are respectively used for a receiving chain and an emitting chain in a wireless receiver chip. The filter circuit comprises a first third-order low-pass filter, a second third-order low-pass filter, a multi-resistance network, a first extra input end, a second extra input end, a first first-order passive RC (Remote Control) filter and a second first-order passive RC filter. The filter circuit has the advantages that the double-mode type active power filter circuit can be controlled through an internal switch and can be configured to be at the two work modes, so that the area of the chip is saved and the cost of a system is reduced.

Description

technical field [0001] The invention relates to a dual-mode active filter circuit with adjustable bandwidth, which belongs to the technical field of analog integrated circuits. Background technique [0002] The technology of using CMOS technology to realize short-distance wireless transceiver chips is relatively mature, and short-distance wireless transceiver chips have been widely used in wireless mouse, wireless remote control, wireless data transmission, and other wireless network systems. In the market, a variety of products have appeared, and the competition of wireless transceiver chips is becoming increasingly fierce. How to reduce chip area and save cost has become the focus of short-distance wireless transceiver chip design. [0003] The short-distance wireless transceiver chip is divided into a receiving link and a transmitting link, and its working mode is half-duplex mode, that is, the chip can only receive signals or only transmit signals at the same time. Thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H7/12
Inventor 潘文光肖时茂黄伟于云丰
Owner WUXI ZHONGKE MICROELECTRONICS IND TECH RES INST
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