Orthogonal inductance-capacitance voltage-controlled oscillator with low power consumption and low phase noise

Abstract

The invention discloses an orthogonal inductance-capacitance voltage-controlled oscillator with low power consumption and low phase noise, which comprises two voltage-controlled oscillators VCO with the same structure, an MOS transistor NM4 in a diode connection mode and a low-pass RC filter LPF, wherein each VCO comprises an LC resonance network formed by an inductor and a distributed varactor structural circuit, a negative resistance differential pair transistors with upper P and lower N being complementary, a series coupling tube connected with the negative resistance differential pair transistors with upper P and lower N being complementary and tail current tube, and the negative resistance differential pair transistors with upper P and lower N being complementary are connected with the LC resonance network; the series coupling tubes in the two VCOs are connected; and the MOS transistor NM4 in the diode connection mode, the low-pass RC filter LPF and the tail current tubes in the two VCOs are sequentially connected to form a current mirror. The scheme disclosed by the invention has the characteristics of low power consumption, low phase noise, low phase error and high linear gain, and is applicable to phase-locked loop type frequency synthesizers.

Description

technical field [0001] The invention relates to the technical field of radio frequency integrated circuits, in particular to an orthogonal inductance-capacitance voltage-controlled oscillator with low power consumption and low phase noise. Background technique [0002] In recent years, with the rapid development of modern wireless communication technology and the rapid popularization of wireless portable devices, people's requirements for the mobility of electronic products have been limited by the development of battery capacity, and people have paid more and more attention to low power consumption design. At the same time, zero-IF and low-IF transceivers are increasingly used in wireless mobile communication systems due to their low power consumption, low cost, and high integration. Transceivers with zero-IF and low-IF structures require quadrature signals to achieve quadrature modulation and demodulation. Such a voltage-controlled oscillator (VCO) with low power consumpti...

AI Technical Summary

Problems solved by technology

The third is the VCO two-frequency structure, which oscillates the VCO at twice the target frequency, and then directly divides the frequency by two to achieve quadrature. Since both the VCO and the frequency divider work at twice the target frequency, the power consumption increases , and the quadrature performance will be affected by the duty cycle of the VCO output waveform

Although the phase error in this scheme is only a weak function of the coupling strength, the phase error and phase noise performance can be optimized at the same time, but the power consumption and phase noise are still high, and further improvements are necessary

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