Miniature power divider based on high Q-value tunable active inductor

Abstract

The present invention discloses a miniature power divider based on a high Q-value tunable active inductor. The power divider comprises an input port (P1), a capacitive unit, a first active inductor, asecond active inductor, an isolation resistor, a first output port (P2) and a second output port (P3). The first active inductor and the second active inductor have the identical structures which areimplemented based on the gyrator theory, and each is formed by a positive transconductance amplifier, a negative transconductance amplifier, a Cascode current mirror structure forming a feedback loopand a dual external voltage biasing circuit. Compared to a traditional passive power divider, the novel power divider employs the active inductor to replace the passive spiral inductor to achieve high quality factor (Q value), a tunable high work frequency range and a tunable inductive value so as to greatly reduce the chip area while the power consumption is not greatly increased, weaken the substrate parasitic effect influence and achieve miniaturization, low-insertion power consumption and high isolation performance.

Description

technical field [0001] The invention relates to the field of radio frequency integrated circuit design, in particular to a miniature power divider based on a high-Q tunable active inductance. Background technique [0002] At present, the design of miniaturized radio frequency integrated circuits has very important theoretical and practical significance for the realization of implantable biomedical devices (such as wireless capsule endoscopes) or emerging wearable devices that work in the human body. [0003] In the design of miniaturized radio frequency integrated circuits, the power divider is a key component of radio frequency circuits such as mixers, phase shifters, and power amplifiers. It is a part of dividing the input signal into several equal or unequal power output signals. A multi-port network device, its performance directly affects the energy distribution and synthesis efficiency of the entire system. In order to meet the increasing distribution requirements of ...

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Problems solved by technology

The Wilkinson power divider based on the transmission line is composed of a quarter-wavelength impedance transformation structure and an isolation resistor. The design method of this type of power divider is relatively flexible, and the insertion loss is low. The disadvantage is that the working bandwidth is narrow, and the transmission line structure requires a large chip area.

A power divider based on lumped LC passive components is composed of a series capacitor C and a parallel passive spiral inductor L, such as figure 1 As shown, its input and output reflection coefficients are good, and the isolation between output ports is high. However, due to the shortcomings of the passive spiral inductor, such as large area, low quality factor (Q), and non-tunable inductance, it is difficult to meet the needs of miniaturized power splitters. application requirements

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