Adjustable on-chip inductor with superhigh Q value

Abstract

An adjustable on-chip inductor with a superhigh Q value comprises an inductor unit, a capacitance regulating and controlling unit and a negative resistance regulating and controlling unit. The inductor unit is provided with a primary inductor and a secondary inductor with electromagnetically coupled, and two ends of the primary inductor are connected with radio frequency output. The capacitance regulating and controlling unit is provided with two serially connected variable capacitors C1 and C2, the serial connection ends of the variable capacitors C1 and C2 are connected with an external control signal VC1, and the other ends of the variable capacitors C1 and C2 are respectively connected with an in-phase end and an inverse-phase end of the secondary inductor. The negative resistance regulating and controlling unit is provided with five transistors, a grid electrode of the transistor M1 is connected with an externally input control signal VC2, a source electrode of the transistor M1 is earthed, a drain electrode of the transistor M1 is connected together with source electrodes of the transistors M2 and M3, a grid electrode of the transistor M2 is connected together with drain electrodes of the transistors M3 and M5 and a grid electrode of the transistor M4 and the inverse-phase end of the secondary inductor, a grid electrode of the transistor M3 is connected together with drain electrodes of the transistors M2 and M4 and a grid electrode of the transistor M5 and the in-phase end of the secondary inductor, and source electrodes of the transistors M4 and M5 are connected with a power source VDD (voltage drain drain).

Description

technical field [0001] The invention relates to an on-chip inductance, in particular to an ultra-high Q-value on-chip adjustable inductance, which belongs to the technical field of radio frequency circuits. The invention can be effectively applied in the design of radio frequency circuits, and has the effects of increasing the reconfigurability of the circuit, improving the noise of the circuit, improving the frequency selection characteristic of the resonant cavity, reducing the size of the circuit and the like. Background technique [0002] On-chip inductors are widely used in radio frequency circuits, and their functions mainly include series and parallel resonance, filtering and impedance transformation. When the operating frequency of the circuit is low, the corresponding inductance value is very large, the occupied area will be very large, and its ohmic loss and substrate loss are relatively serious, resulting in a very poor quality factor, and the further consequence ...

AI Technical Summary

Problems solved by technology

The MOS tubes used in these two ways are used as switches, resulting in a significant deterioration of the inductance quality factor, so these two methods are rarely used in the design of high-performance RF circuits

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