Fourth-order active LC radio frequency band pass filter

A radio frequency band and filter technology, applied in the field of fourth-order active LC radio frequency band-pass filter, can solve the problem of poor in-band flatness, and achieve the effect of improving quality factor, improving integration and saving PCB board area.

Active Publication Date: 2012-02-01
SOI MICRO CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0005] The present invention provides a fourth-order active LC radio-frequency band-pass filter for the problem of poor in-band flatness of the second-order active LC radio-frequency band-pass filter

Method used

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  • Fourth-order active LC radio frequency band pass filter
  • Fourth-order active LC radio frequency band pass filter
  • Fourth-order active LC radio frequency band pass filter

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Embodiment Construction

[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0021] figure 1 It is a schematic structural diagram of a fourth-order active LC radio frequency bandpass filter according to an embodiment of the present invention. Such as figure 1As shown, the fourth-order active LC RF bandpass filter includes an input impedance matching network 101 , a first-stage second-order LC resonator 102 , a coupling network 103 , a second-stage second-order LC resonator 104 and an output impedance matching network 105 . The input impedance matching network 101 is connected to the differential signal input end, and is used to match the input impedance of the radio frequency bandpass filter to 50Ω; the first-order second-order LC resonator 102 is connected to the input impedance matching n...

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Abstract

The invention, which belongs to the integrated circuit design technology field, relates to a fourth-order active LC radio frequency band pass filter. Based on a CMOS technology, forms of current detection resistor and transconductance are used to simulate inductive coupling and to couple a two-level second-order LC resonator into the fourth-order LC band pass filter. The band pass filter comprises: the two-level second-order LC resonance circuits with a same connection mode and symmetrical structures, two input impedance matching circuits, two interstage coupling circuits and two output impedance matching circuits. In-band flatness of the second-order active LC band pass filter is bad. By using the radio frequency band pass filter of the invention, the above problem can be solved. The CMOS technology can be used to perform integration on a sheet so that an integration level can be substantially raised, which provides a feasible scheme for realizing monolithic integration on a radio-frequency front end of a wireless receiver.

Description

technical field [0001] The invention relates to a fourth-order active LC radio frequency bandpass filter, which belongs to the technical field of integrated circuit design. Background technique [0002] In recent years, with the rapid development of the wireless communication market, the requirements for low cost and miniaturization of mobile communication equipment such as mobile phones, GPS navigation equipment, and electronic medical equipment are getting higher and higher. As the most important radio frequency front-end module in the mobile communication system, it is also developing towards SoC to meet the requirements of low cost and miniaturization of the system. [0003] In the mobile communication system, the RF front-end module is used to modulate the transmitted signal and demodulate the received signal. Taking the RF front-end module in the receiver as an example, its composition includes a low-noise amplifier, a mixer, a frequency synthesizer, and a band-pass fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/04
Inventor 刘欣张海英赵磊
Owner SOI MICRO CO LTD
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