A Micro Power Divider Based on High Q-value Tunable Active Inductor

Abstract

The invention discloses a miniature power divider based on a high-Q tunable active inductance. The miniature power divider includes an input port (P1), a capacitor unit, a first active inductance, a second active inductance, an isolation Resistor, first output port (P2) and second output port (P3). The first active inductor and the second active inductor have exactly the same structure and are realized based on the gyrator principle. They are composed of a positive transconductance amplifier, a negative transconductance amplifier, a Cascode current mirror structure that forms a feedback loop, and a double external voltage Bias circuit configuration. Compared with the traditional passive power divider, the new type of power divider proposed by the present invention adopts an active inductance to replace the passive spiral inductance, and realizes high quality factor (Q value), working frequency range and inductance value tunable, without increasing the power consumption. When the power consumption is too large, the chip area is greatly reduced, and the influence of the parasitic effect of the substrate is weakened, so that the power divider can achieve miniaturization, low insertion loss 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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