Three-inductor stray capacitance counteracting network, broadband power amplifier, chip and equipment

By using three-inductance parasitic capacitors in differential multi-layer stacking transistors to cancel the network, eliminate the influence of transistor parasitic capacitors, and combine the differential dual stacking structure and transformer to achieve broadband matching, the problems of high output power and high efficiency in the millimeter wave band are solved, expanding the bandwidth of the circuit and reducing the supply voltage requirements.

CN120377838APending Publication Date: 2025-07-25SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202510354314.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-25
Publication Date
2025-07-25

AI Technical Summary

Technical Problem

The prior art is difficult to achieve high output power and high efficiency power amplifiers in broadband in the millimeter wave band, and existing solutions increase design complexity and chip area, making it difficult to simultaneously optimize bandwidth, output power and efficiency.

Method used

A three-inductance parasitic capacitor cancellation network is used, and is set at the intermediate node of the differential multi-layer stacking transistor to eliminate the influence of the equivalent parasitic capacitor of the differential circuit transistor, and reduce signal loss by increasing the impedance of the signal path to the ground, combining the differential dual stacking structure and transformer to achieve broadband matching.

Benefits of technology

It improves the output power, efficiency and bandwidth of the power amplifier of the wireless communication system, expands the operating frequency and bandwidth of the circuit, reduces the supply voltage requirements, and avoids irreversible effects such as transistor breakdown.

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Abstract

The invention discloses a three-inductor stray capacitance counteracting network, a broadband power amplifier, a chip and equipment, and the three-inductor stray capacitance counteracting network is arranged at an intermediate node of a differential stacked transistor and is used for eliminating the influence of the equivalent stray capacitance of the differential stacked transistor; comprising a first inductor, a second inductor and a third inductor, the first inductor and the second inductor are matched and are respectively connected in series between the output end of the upper-layer transistor and the input end of the lower-layer transistor, and two ends of the third inductor are respectively connected to the output end of the upper-layer transistor or the input end of the lower-layer transistor. According to the three-inductor parasitic cancellation technology provided by the invention, the output power, the efficiency and the bandwidth of the power amplifier of the wireless communication system are effectively improved by increasing the impedance from a signal path to the ground, reducing the signal loss and eliminating the influence caused by the parasitic capacitance of the transistor at an intermediate node of the differential stacked transistor. The method can be widely applied to the field of radio frequency integrated circuit design.
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