Nested-Inductor VCO Layout for Low-Power Dual-Band RF
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Solution Overview
Problem
Existing RF transceivers face challenges in reducing power consumption and circuit area due to high-frequency VCOs, which are prone to pulling effects and require additional low-frequency VCOs, leading to increased cost and complexity.
Innovation Solution
A VCO design incorporating a first oscillator circuit with a high-frequency inductor embedded inside a second inductor to form a nested configuration, maintaining low mutual inductance and coupling, thereby reducing power consumption and circuit area while supporting both high-frequency transmission and low-frequency reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-frequency VCO is used for data transmission, then transmission performance is improved, but power consumption increases and the circuit becomes prone to pulling effects
Solution Approach 1:
The VCO is divided into two separate oscillator circuits: a first VCO for high-frequency transmission and a second VCO for low-frequency reception. This segmentation allows each circuit to operate at its optimal frequency range, enabling the transmission circuit to achieve high transmission performance while the reception circuit consumes less power, thus resolving the contradiction between transmission performance and power consumption.
Solution Approach 2:
The nested inductor structure serves multiple functions: it provides the necessary inductance for both high-frequency and low-frequency operations, reduces the overall circuit area, and minimizes mutual inductance between the two oscillator circuits. This multi-functional design allows a single inductor structure to support both transmission and reception operations efficiently.
2Reliability
If a high-frequency VCO is used, then transmission capability is improved, but circuit area increases due to additional low-frequency VCO requirements
Solution Approach 1:
The first inductor for the high-frequency VCO is nested within the second inductor for the low-frequency VCO, forming a compact nested structure. This nesting approach allows both inductors to share the same physical space, significantly reducing the overall circuit area while maintaining the transmission capability provided by the high-frequency VCO.
Solution Approach 2:
The two inductor structures are merged into a single nested configuration where the first inductor is placed inside the second inductor. This merging of spatial resources allows both oscillator circuits to coexist in a compact area, resolving the contradiction between transmission capability and circuit area.
3Use of energy by moving object
If additional low-frequency VCOs are added to reduce power consumption, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The nested inductor configuration simplifies the overall circuit structure by integrating two inductors into a compact unit. This nested design reduces the number of discrete components and interconnections required, thereby lowering device complexity while still enabling the dual-VCO architecture that improves power efficiency.
Solution Approach 2:
The nested inductor structure serves both the high-frequency and low-frequency VCOs simultaneously, reducing the need for separate, dedicated inductor structures. This multi-functional design reduces circuit complexity by sharing common elements between the two oscillator circuits while maintaining power efficiency benefits.
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 nested inductor configuration reduces power consumption and circuit area without increasing size, improving performance and reducing phase noise, while maintaining efficient operation in both transmit and receive modes.
Implementation Method 1
The first inductor is embedded inside the second inductor so that a total mutual inductance between the first and second inductors is smaller than or equal to a predetermined threshold
Implementation Method 2
controlling, at a transmit mode, an operation of the first oscillator circuit to provide a TX local oscillator signal
Implementation Method 3
controlling, at a receive mode, an operation of the second oscillator circuit to provide a RX local oscillator signal
Data Source
AI summary
In certain aspects, a voltage controlled oscillator (VCO), a system circuit, and a control method thereof are disclosed. The VCO includes a first oscillator circuit and a second oscillator circuit. The first oscillator circuit includes a first inductor. The second oscillator circuit includes a second inductor. The first inductor is embedded inside the second inductor so that a total mutual inductance between the first and second inductors is smaller than or equal to a predetermined threshold.