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Novel adjustable active inductor with great inductance and high Q value

A technology of active inductance and large inductance, applied in the direction of frequency selection two-terminal-to-network, multi-terminal-to-network, etc., can solve the problems of narrow bandwidth, low equivalent inductance value and low Q value, and achieve high Q value and large inductance value. Effect

Inactive Publication Date: 2014-01-22
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

But traditional active inductors have the disadvantages of low equivalent inductance and Q value, and narrow bandwidth

Method used

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  • Novel adjustable active inductor with great inductance and high Q value
  • Novel adjustable active inductor with great inductance and high Q value
  • Novel adjustable active inductor with great inductance and high Q value

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. However, the examples given are not intended to limit the present invention.

[0031] Such as figure 1 with figure 2 As shown, the embodiment of the present invention includes an input and output terminal 1, a Cascode structure 4 and a bias current source 2, and the Cascode structure 4 includes a first transistor 221 connected to a common emitter, a third transistor 223 connected to a common base and a common collector The electrode is connected to the second transistor 222, which also includes an active resistance feedback 3 and a shunt branch 5. The active resistance feedback 3 includes a passive resistance 201 and a second NMOS transistor 202 connected in parallel, and the two ends of the active resistance feedback 3 are respectively It is connect...

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Abstract

The invention provides a novel adjustable active inductor with great inductance and a high Q value, and relates to a radio frequency integrated circuit technology. The novel adjustable active inductor solves the problems that the existing active inductor has the disadvantages of lower equivalent inductance and Q value and smaller bandwidth. The inductor comprises an input / output end, a Cascode structure, a bias current source, an active resistance feedback and a shunt branch, wherein the active resistance feedback comprises a passive resistor and a second NMOS (N-channel Metal Oxide Semiconductor) tube which are connected in parallel; in addition, the two ends of the active resistance feedback are connected with a base of a second transistor and a collector of a third transistor respectively; the shunt branch comprises a first NMOS tube; and a drain of the first NMOS tube is connected with an emitter of the third transistor. According to the active inductor, the great inductance and the high Q value of the active inductor as well as tunability of the inductance and the Q value are realized by adjusting voltage of the NMOS tubes in the active resistance feedback and the shunt branch.

Description

technical field [0001] The invention relates to the technical field of radio frequency integrated circuits, in particular to a novel adjustable active inductance with large inductance and high Q value. Background technique [0002] Inductance plays an important role in each radio frequency module (filter, low noise amplifier, power amplifier, mixer, voltage controlled oscillator, etc.) in the wireless transceiver, such as impedance transformation, feedback, tuning, filtering and other functions. [0003] At present, the more inductance used in these integrated circuit modules is the passive spiral inductor, but it has the disadvantages of occupying a large chip area, low quality factor Q, and untunable inductance value. With the development of integrated circuits in the direction of high speed, miniature, adjustable and portable, these shortcomings become more and more obvious. In order to solve these shortcomings of passive spiral inductors, an equivalent inductance circui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H11/04
Inventor 张万荣高栋谢红云金冬月丁春宝赵彦晓陈亮付强鲁东周孟龙张卿远邵翔鹏霍文娟
Owner BEIJING UNIV OF TECH
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