Active inductor with high Q value, high inductance and tunable operating frequency range

Abstract

The invention discloses an active inductor with a high Q value, a high inductance and a tunable operating frequency range. The active inductor comprises a variable capacitor, an active feedback resistor, a positive transconductance amplifier, a negative transconductance amplifier, a first adjustable current source, a second adjustable current source and a stopping condenser, wherein the negative transconductance amplifier adds a multiple voltage modulation circuit on a common source-common gate structure; the adjustable active feedback resistor is connected between the positive transconductance amplifier and the negative transconductance amplifier for improving the real part loss of the active inductor to further improve the Q value; the variable capacitor is connected to the input end of the positive transconductance amplifier and the output end of the negative transconductance amplifier for adjusting the load capacitance of the active inductor to expand the adjusting range of the inductance and the Q value. Two adjustable current sources respectively provide direct current bias for the positive transconductance amplifier and the negative transconductance amplifier and can adjust the operating frequency range of the active inductor. Through the constituent parts, the operating frequency range, the inductance and the Q value of the active inductor can be all adjusted.

Description

technical field [0001] The invention relates to the field of radio frequency devices and integrated circuits, in particular to an active inductance with high Q value, inductance value and adjustable working frequency range. Background technique [0002] In radio frequency integrated circuits (RFICs), inductors are one of the commonly used components. For example, in a low-noise amplifier, the use of inductors can achieve input-output matching and improve the gain flatness of the amplifier; in voltage-controlled (current-controlled) oscillators, the use of inductors can achieve signal generation; in mixers, use The inductance can realize the modulation of the signal. [0003] On-chip spiral inductors are commonly used in RFICs. Since the inductance value of the on-chip spiral inductor is closely related to its geometric size, the larger the inductance value, the larger the chip area occupied. In practical applications, it often occupies most of the chip area, which increase...

AI Technical Summary

Problems solved by technology

[0005] Existing active inductors usually use a gyrator structure, turning the capacitance of the gyrator itself into an equivalent inductance. The negative transconductance amplifier often adopts a single-stage amplifier structure. The active inductor with this structure has a variable inductance value. The disadvantages of small tuning range, low Q value, and the inability to change the operating frequency range of inductors limit their application in high-frequency RFICs.

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