Multi-Mode VCO Resonance Circuit for Wide Tuning and Low Phase Noise
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Solution Overview
Problem
Conventional voltage controlled oscillators (VCOs) face challenges in achieving a large tuning range while maintaining a compact size, as they often require a large area to accommodate the necessary components for optimal phase noise and tuning bandwidth, which are constrained by each other.
Innovation Solution
A multi-mode voltage controlled oscillation device is designed with an oscillation core circuit and at least four resonance circuits, each with two input ends and one power supply end, connected in a simple and tight structure to allow for multiple resonance frequencies and reduced area usage, utilizing a switch circuit and control device to adjust resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cross-coupled voltage controlled oscillator with LC resonator is used to generate oscillation signal, then phase noise performance is improved, but tuning bandwidth is constrained
Solution Approach 1:
The oscillator is divided into multiple independent resonance circuits (first, second, third, and fourth resonance circuits), each capable of operating at different resonance frequencies. This segmentation allows the system to achieve both low phase noise within each resonant mode and broad tuning bandwidth by switching between multiple modes, resolving the contradiction between phase noise performance and tuning bandwidth.
2Adaptability or versatility
If the area of voltage controlled oscillator is increased to increase turning range, then tuning range is improved, but device area becomes too large
Solution Approach 1:
Each resonance circuit is designed to serve multiple functions: it provides both narrowband low-phase-noise oscillation at its resonant frequency and contributes to the overall broad tuning range when combined with other circuits. The shared oscillation core circuit and common power supply further reduce area while enabling multi-frequency operation, achieving large tuning range without proportionally increasing device area.
3Measurement precision
If quality factor of load resonance network is increased to reduce phase noise, then phase noise is improved, but power consumption increases
Solution Approach 1:
The system achieves low phase noise through multiple resonance circuits operating at different frequencies rather than requiring one circuit to operate at excessively high quality factor. By distributing the oscillation function across multiple circuits with moderate quality factors, the system achieves comparable or better phase noise performance with reduced overall power consumption, as each circuit operates efficiently at its optimized resonant frequency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves a larger tuning range with a compact size by allowing each resonance circuit to oscillate at multiple frequencies, reducing phase noise and power consumption, and stabilizing oscillation signals through negative impedance compensation.
Implementation Method 1
a most popular method is to use a cross-coupled voltage controlled oscillator with an LC resonator to generate the oscillation signal
Implementation Method 2
stabilizing oscillation signals through negative impedance compensation
Data Source
AI summary
The present disclosure relates to a multi-mode voltage controlled oscillation device and a wireless transceiver. The multi-mode voltage controlled oscillation device includes an oscillation core circuit and at least four resonance circuits. Each of the resonance circuits includes two input ends and one power supply end. The two input ends of each of the resonance circuits are respectively connected to an output end of the oscillation core circuit, and the power supply end of each of the resonance circuits is configured to be connected to a power supply. The multi-mode voltage controlled oscillation device provided by the present disclosure is formed by connecting the oscillation core circuit with each resonance circuit and connecting the resonance circuits with each other, with a simple structure, a tight connection, and a small area.