Differential derivative structure circuit based on three-coupling transformation and amplifier

By using a differential derivative structure circuit with three-coupled transformers, the problems of gain reduction, area occupation, and noise degradation in the existing technology are solved, achieving the effects of gain improvement, noise suppression, and area saving.

CN121864040AActive Publication Date: 2026-04-14UNIV OF SCI & TECH OF CHINA
6 Cites 0 Cited by

Patent Information

Application Number
CN202610323713.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-17
Publication Date
2026-04-14
Estimated Expiration
2046-03-17

AI Technical Summary

Technical Problem

Existing differential derivative circuits suffer from problems such as significant gain reduction, additional area occupation, and deterioration of noise figure due to the use of large capacitors and large resistors.

Method used

A differential derivative structure circuit with three-coupled transformers is adopted, which integrates the power supply of the main amplifier tube and the auxiliary amplifier tube into the inductor matching network. Inductive coupling is used to achieve the same source coupling of signals and the physical isolation of DC path, reducing the use of capacitors and resistors. The power splitting function is achieved through three-coupled inductors to adapt to different output signal group requirements.

Benefits of technology

It significantly improves gain, reduces losses from capacitors and resistors, lowers the noise figure, saves circuit area, and adapts to different output signal group requirements.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses a differential derivative structure circuit based on three-coupling transformation and an amplifier, and relates to the technical field of amplification circuit design. The differential derivative structure circuit comprises a three-coupling inductance network and N output parts. Through a three-coupling transformation mode, power supply of a main amplifier tube and an auxiliary amplifier tube in a differential derivative structure formed by connecting MOS tubes in parallel is integrated into an inductance matching network, so that homologous coupling of the main amplifier tube and the auxiliary amplifier tube on a radio frequency signal path is realized, physical isolation and independent bias control are also realized on a direct current path, and the power supply efficiency is improved. Therefore, a resistor does not need to be used, excessive use of a capacitor is avoided, loss caused by self impedance of the capacitor and ground parasitic capacitance loss are reduced, gain is greatly improved, extra area occupation caused by the capacitor and the resistor is effectively inhibited, and thermal noise introduced by the resistor is eliminated by utilizing the characteristic of low impedance of inductive coupling. Therefore, post-stage noise is effectively suppressed, and the noise coefficient is reduced.
Need to check novelty before this filing date? Find Prior Art