Broadband, High-Q, Tunable Active Inductor Using Negative Resistance Structure

Abstract

The invention provides a broadband, high Q-factor and tunable active inductor of a negative resistance structure. The inductor comprises a negative-resistance feedback transistor, a negative trsanscondutance amplifier, a common-gate trsanscondutance amplifier, a first adjustable resistor network, a second adjustable resistor network, a first positive trsanscondutance amplifier, a second positive trsanscondutance amplifier, a first adjustable current source and a second adjustable current source. The negative-resistance feedback transistor is connected with the negative trsanscondutance amplifier to form a negative resistance structure, so that the Q-factor of the active inductor is improved. The bandwidth of the active inductor is improved by the common-gate trsanscondutance amplifier. The negative trsanscondutance amplifier and the two positive trsanscondutance amplifiers together form a dual gyrator structure, so that the equivalent inductance and the Q-factor of the active inductor are improved. The equivalent inductance and the Q-factor of the active inductor are regulated by the two adjustable resistor networks. The current bias is provided by the two adjustable current sources. The frequency bandwidth of the inductance of the active inductor is up to be over 10 GHz, and the inductance of the active inductor can be tuned within 5-60 nH. The Q-factor of the active inductor is up to 1000. Moreover, the frequency band of the active inductor, with the Q-factor thereof larger than 20, is up to 5 GHz in frequency.

Description

technical field [0001] The invention relates to the fields of radio-frequency devices and integrated circuits, in particular to a wide-band, high-Q and tuneable active inductance with a negative resistance structure. Background technique [0002] In radio frequency integrated circuits, the inductor is an important component. For example, an LC oscillator can oscillate a signal through an inductor, a low-noise amplifier can use an inductor to achieve matching, and improve the flatness of the gain, and a mixer can realize signal modulation through an inductor. [0003] In radio frequency integrated circuits, the inductor is usually an on-chip passive spiral inductor. There is an inherent relationship between the inductance value and the size of the on-chip passive spiral inductor. To obtain a high inductance value, the area of ​​the inductance must be increased, which occupies a large part of the area of ​​the integrated circuit chip, so it is largely restricted integrated c...

AI Technical Summary

Problems solved by technology

However, the current active inductors have problems such as low Q value, narrow bandwidth, and low adjustable range.

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