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A multi-passband complex filter circuit

A complex filter and multi-passband technology, which is applied in the direction of multi-terminal pair network and frequency selective two-terminal pair network, can solve the problems of single energy efficiency and poor flexibility, and achieve the effect of flexible use, low cost and wide application range

Pending Publication Date: 2019-05-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of single energy efficiency and poor flexibility of the traditional complex filter, adopt the switch resistor network to flexibly set the center frequency of the complex filter, and provide a single-chip multi-pass band complex filter circuit, which can be used in various The design of the low-IF structure transceiver has a good application prospect

Method used

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  • A multi-passband complex filter circuit
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  • A multi-passband complex filter circuit

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Embodiment 1

[0016] Embodiment 1. A multi-pass band complex filter circuit

[0017] Such as figure 1 As shown, a multi-passband complex filter circuit provided by the present invention is composed of a data register 1, a switch resistor network 2, a real part active filter 3 and an imaginary part active filter 4.

[0018] The data register 1 has two input terminals and two output terminals, the two input terminals are respectively connected with the external serial bus signal CLK and DAT, and the two output terminals are connected with the two input terminals of the switch resistor network 2; The switch resistance network 2 described above has six input terminals and four output terminals, wherein two input terminals are connected with the two output terminals of the data register 1, and the other four input terminals are respectively connected with the two output terminals of the real part active filter 3. The output terminal is connected to the two output terminals of the imaginary par...

Embodiment 2

[0019] Embodiment 2, the implementation of real part active filter

[0020] Such as figure 2As shown, the real part active filter 3 is made up of the first operational amplifier 5, resistor Rinpi, resistor Rinni, resistor Rfpi, resistor Rfni, capacitor Cfpi and capacitor Cfni; wherein, the non-inverting input terminal of the first operational amplifier 5 Connect with one end of resistance Rinpi, resistance Rfni, electric capacity Cfni simultaneously, and be connected together with the output terminal (S2) of switch resistance network; One end is connected and connected with the output terminal (S1) of the switch resistor network; the other end of the resistor Rinpi and the resistor Rinni are connected with the external input signal; the resistor Rfpi and the capacitor Cfpi are connected in parallel, and connected across the same phase of the first operational amplifier 5 On the output terminal node and the inverting input terminal node; the resistor Rfni and the capacitor Cfn...

Embodiment 3

[0021] Embodiment 3, the implementation of imaginary part active filter

[0022] Such as image 3 As shown, described imaginary part active filter 4 is made up of second operational amplifier 6, resistance Rinpq, resistance Rinnq, resistance Rfpq, resistance Rfnq, electric capacity Cfpq and electric capacity Cfnq; Wherein, the noninverting input end of second operational amplifier 6 Connect to one end of resistor Rinpq, resistor Rfnq, and capacitor Cfnq, and connect to the output end (S7) of the switch resistor network; the inverting input end of the second operational amplifier 6 is connected to one end of resistor Rinnq, resistor Rfpq, and capacitor Cfpq , and connected together with the output end (S8) of the switched resistor network; the other end of the resistor Rinpq and the resistor Rinnq are connected with the external input signal; the resistor Rfpq and the capacitor Cfpq are connected in parallel, and connected across the non-inverting output terminal of the second ...

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Abstract

The invention discloses a multi-passband complex filter circuit. The multi-passband complex filter circuit is used for various low and intermediate frequency radio frequency receivers and can effectively suppress mirror image interference. The multi-pass band complex filter circuit is composed of a data register, a switch resistor network, a real part active filter and an imaginary part active filter. According to the multi-passband complex filter circuit provided by the invention, a multi-channel circuit structure is adopted, the control word is written into the data register through the outer pin, and the connection mode of the switch resistance network is set according to the value of the data register, so that the complex filter has different center frequencies and bandwidths, and theapplication range of the complex filter is expanded.

Description

technical field [0001] The invention relates to the fields of low-intermediate frequency receiver ASIC design and wireless communication, and in particular to a multi-pass band complex filter circuit based on switch resistance. Background technique [0002] With the development of wireless communication technology, single-chip wireless connection integrated circuits present a wide range of application prospects. In the basic structure of RF transceivers, low-IF structure receivers have attracted great attention from the industry due to their high integration and no DC offset. However, the low-IF structure receiver circuit contains image signals, and the suppression of image interference has become a key technology for the development of low-IF structure receivers. Complex filters can effectively suppress image signals. At present, various complex filter circuits with high integration and low power consumption have become the focus of scientific research and industrial devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/12
Inventor 耿卫东刘远泽曾夕刘艳艳刘会刚陈志博
Owner NANKAI UNIV
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