Tunable inductor based on linear high Q value and high-frequency voltage-controlled oscillator

Abstract

According to a tunable inductor based on the linear high Q value and a high-frequency voltage-controlled oscillator, the coupling capacitors C1 and C2 between different ports of the tunable inductor are adjusted, the inductance value of the inductor can be roughly adjusted and finely adjusted, the rough adjustment change range can reach 10 pH, the fine adjustment precision reaches 0.03 pH / f, and therefore the voltage-controlled oscillator has the wide frequency adjustment range. In addition, due to the fact that the inductor is adjusted through the capacitor, compared with a voltage-controlled oscillator with the inductance value adjusted through a resistor in the prior art, other redundant resistors are not introduced, and the voltage-controlled oscillator can keep a high quality factor Q value.

Description

technical field [0001] The invention belongs to the technical field of voltage-controlled oscillators, and in particular relates to a linear high-Q value tunable inductor and a high-frequency voltage-controlled oscillator. Background technique [0002] The phase-locked loop frequency synthesizer circuit directly affects the performance of the wireless transceiver. The VCO is the core module in the frequency synthesizer. The tuning range of the VCO determines the output frequency band, phase noise and power consumption performance of the phase-locked loop system. Phase-locked loops and indeed the entire wireless transceiver system are critical. [0003] The oscillator achieves stable oscillation when receiving an excitation signal outside itself, and the LC VCO is used in frequency bands above GHz and has good phase noise. refer to Figure 1a , Figure 1a It is a traditional LC VCO structure. exist Figure 1a Among them, L is a high-quality factor three-terminal inductor, C...

AI Technical Summary

Problems solved by technology

In terms of physical implementation, since increasing Csw will introduce larger parasitic capacitance, it will lead to frequency drop and attenuation of oscillation stability

Therefore, in the case of traditional use of fixed inductance, it is difficult to achieve high frequency and wide tuning range

[0004] The existing technology proposes to change the inductance value by adjusting the resistance, refer to Figure 1b As shown, but the large resistance introduced will seriously affect the quality factor (Q value) of the inductor, which will deteriorate the performance of phase noise and oscillation stability.

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