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Fully Differential Floating Active Inductor

A fully differential, floating technology, used in differential amplifiers, multi-terminal pair networks, DC-coupled DC amplifiers, etc.

Active Publication Date: 2017-06-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention belongs to the field of radio frequency integrated circuits

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  • Fully Differential Floating Active Inductor
  • Fully Differential Floating Active Inductor
  • Fully Differential Floating Active Inductor

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Embodiment Construction

[0027] In order to make the content of the present invention more intuitive and easy to understand, the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] The invention is designed and verified based on TSMC RF CMOS 0.18μm technology. The topology of the whole circuit is as figure 1 shown. It mainly includes: a first control current source (1) and a second control current source (2), a first NMOS bias current source (3) and a second NMOS bias current source (4), an NMOS differential pair circuit (5) , PMOS differential pair circuit (6), first PMOS current buffer (7) and second PMOS current buffer (8), first PMOS bias current source (9) and second PMOS bias current source (10) , the feedback resistor (11); the feedback resistor (11) includes two feedback resistors R on the differential branch circuit of the NMOS differential pair circuit (5) and the PMOS differential pair circuit (6) f1 and R f2 ; where M N1 , M N2 ...

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Abstract

The invention relates to the field of radio frequency integrated circuits, in particular to a fully differential floating active inductance, which has the characteristics of wide frequency band, high Q (quality factor) value and tunability. The invention adopts two differential pair circuit configurations to respectively provide positive and negative transconductance, and adopts a common gate circuit structure as a current buffer to return the current generated by the negative transconductance to the input terminal. The negative transconductance differential pair circuit adopts a direct cross-coupling structure to form a negative resistance compensation network to offset the resistance generated by the current buffer, thereby reducing the real part loss and increasing the Q value. Further, a feedback resistor is added between the positive transconductance and the negative transconductance to increase the Q value. The sum of the current buffer and the gate-source capacitance of the negative transconductance differential pair circuit forms a slew capacitance, so the floating active inductance has a larger equivalent inductance value. By adjusting the control voltage of the current source, the inductance value and Q value can be tuned.

Description

technical field [0001] The invention relates to the field of radio frequency integrated circuits, in particular to a fully differential floating active inductance. Background technique [0002] With the rapid development of wireless communication technology, inductive components play an increasingly important role in communication systems, especially in radio frequency circuits. With its unique characteristics, inductors are widely used in impedance matching, bandwidth expansion, frequency compensation, etc., and play a vital role in RF circuits such as low noise amplifiers, power amplifiers, oscillators, and mixers. [0003] To realize fully integrated RF circuits, on-chip passive spiral inductors are widely used. Although it has advantages such as good linearity, lower noise and lower power consumption. But it occupies a large chip area, and the inductance value is not adjustable, and the Q value is low, which seriously limits the circuit performance. In recent years, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45H03H11/04
Inventor 张万荣赵飞义陈昌麟江之韵胡瑞心赵彦晓
Owner BEIJING UNIV OF TECH