Double-mode type active power filter circuit with adjustable bandwidth

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

Active Publication Date: 2012-08-15
WUXI ZHONGKE MICROELECTRONICS IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] There is an intermediate frequency filter in both the receiving chain and the transmittin

Method used

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  • Double-mode type active power filter circuit with adjustable bandwidth
  • Double-mode type active power filter circuit with adjustable bandwidth
  • Double-mode type active power filter circuit with adjustable bandwidth

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Embodiment Construction

[0027] The present invention will be further described below with reference to the accompanying 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-resistance network to form a complex filter circuit. , that is, the complex filter is composed of two low-pass filters and a multi-resistance network. When the on and off of the multi-resistance network is controlled, 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 chain to suppress the image signal, and the low-pass filter is used in the transmitting chain to suppress the clock i...

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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, belonging to the technical field of analog integrated circuits. Background technique [0002] The technology of using CMOS technology to realize short-range wireless transceiver chips is relatively mature, and short-range wireless transceiver chips have been widely used in wireless mice, 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 has become increasingly fierce. How to reduce the chip area and save costs has become the focus of short-range wireless transceiver chip design. [0003] The short-range 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 or transmit signals at the same time. This half-duplex working mode...

Claims

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Application Information

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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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