Transformer-coupled voltage-controlled oscillator with long service life

Abstract

The invention discloses a transformer-coupled voltage-controlled oscillator with a long service life. The transformer-coupled voltage-controlled oscillator comprises a core oscillation circuit and anoutput buffer stage circuit. The core oscillation circuit and the output buffer stage circuit are connected with each other, the core oscillation circuit comprises a voltage stabilizing circuit, an inductance-capacitance resonance circuit and a negative-resistance generating circuit, a differential inductor L1 of a primary coil on the inductance-capacitance resonance circuit is magnetically coupled with an inductor L2 of a secondary coil via a transformer structure, the negative-resistance generating circuit comprises an NMOS (N-channel metal oxide semiconductor) transistor M1 and an NMOS transistor M2 which are cross coupled structures, and a drain electrode of the NMOS transistor M1 in the negative-resistance generating circuit is connected with a parallel joint of the inductor L1 of theprimary coil in the inductance-capacitance resonance circuit and a fixed capacitor C1. The transformer-coupled voltage-controlled oscillator has the advantages that ultralow-voltage power can be supplied by the circuits, the transformer-coupled voltage-controlled oscillator is in an ultralow power consumption design and is additionally provided with the voltage stabilizing circuit, accordingly, power can be stably supplied, components of electric appliances can be prevented from being damaged by excessively high or excessively low voltages, and the service life of the transformer-coupled voltage-controlled oscillator can be prolonged.

Description

technical field [0001] The invention relates to the field of radio frequency integrated circuit design, in particular to a transformer-coupled voltage-controlled oscillator with long service life. Background technique [0002] With the advent of the era of intelligent vehicles, Internet of Vehicles, safe vehicles and new energy vehicles, the use of automotive chips is also more extensive. There are also increasing challenges for the design of chips used in the communication between cars. Automotive communication chips typically need to keep working for as long as possible and avoid consuming too much of the vehicle's power. For PLL frequency synthesizers used in RF wireless receivers, VCOs are usually the most power-consuming modules. In order to maintain the performance of the circuit as much as possible under the premise of consuming as little power as possible, reducing the operating voltage of the circuit and making the whole circuit work in the sub-threshold region is...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to reduce the phase noise and bias voltage of the voltage-controlled oscillator, and reduce the power consumption of the voltage-controlled oscillator. The purpose is to provide a transformer-coupled voltage-controlled oscillator with a long service life. The method of coupling the differential inductance in the middle circuit and the single-turn inductance in the secondary circuit through the transformer structure improves the quality factor of the transformer and the inductance-capacitance resonant circuit and reduces the phase noise; the design of removing the tail current tube is adopted, thereby reducing the required The bias voltage realizes the design of ultra-low voltage power supply and ultra-low power consumption; in addition, the voltage stabilizing circuit is set, the power supply is stable, avoiding damage to electrical components due to excessively high or low voltage, and prolonging the service life of the voltage-controlled oscillator

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