Differential active inductor with tunable high Q value

Abstract

The invention provides a differential active inductor with a tunable high Q value, and relates to the technical field of radio frequency integrated circuits. The problem that an existing differential active inductor is large in real part loss and not high in Q value is solved. The tunable differential active inductor comprises a power source, an input and output end, a biasing circuit and a differential Cascode basic structure, and further comprises an active resistance feedback network. The active resistance feedback network is formed by connecting a passive resistor Rf and a PMOS transistor Mp3 in parallel, and the two ends of the active resistance feedback network are connected with the drain electrodes of a transistor Mn1 and a transistor Mn2 in the differential Cascode basic structure. The differential Cascode basic structure is composed of the transistor Mn1, the transistor Mn2, a transistor Mn3 and a transistor Mn4, the transistor Mn1 and the transistor Mn2 are connected with the transistor Mn3 and the transistor Mn4 in a cross-coupled pair mode, and the drain electrodes of the transistor Mn3 and the transistor Mn4 are connected with the source electrodes of the transistor Mn1 and the transistor Mn2. According to the differential active inductor with the tunable high Q value, tunability of the inductance value and the Q value of the differential active inductor can be achieved by tuning of the active resistance feedback network and the biasing circuit.

Description

technical field [0001] The invention relates to the technical field of radio frequency integrated circuits, in particular to a high-Q tunable differential active inductor. Background technique [0002] Inductors are widely used in various radio frequency integrated circuit modules in wireless transceivers, such as filters, low noise amplifiers, voltage controlled oscillators, etc. In these circuit module designs, in order to realize the full integration of the module, people usually use on-chip spiral inductors. However, the on-chip spiral inductor has defects such as low Q value, large area, high production cost, unfavorable integration, and untunable inductance value. [0003] With the continuous reduction of the feature size of integrated circuit devices, integrated circuits are becoming more and more high-speed, miniaturized, and tunable. The above-mentioned shortcomings of on-chip spiral inductors are becoming more and more obvious, which has become a barrier that hind...

AI Technical Summary

Problems solved by technology

However, the traditional differential active inductor has the problems of large real part loss and low Q value, which affects its application in the circuit

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