VCO Switch Rectifier Biasing for Stable LC Resonance
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Solution Overview
Problem
Existing semiconductor devices face challenges in stabilizing LC resonance operations and reducing layout area in voltage controlled oscillators due to increased parasitic capacitance and impedance from resistive elements, leading to increased size and phase noise.
Innovation Solution
The use of high impedance connections between the control node and switch ends through rectifying circuits instead of resistive elements, implemented using diode-connected transistors, reduces layout area while maintaining stable operation and minimizing parasitic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistive elements are used to connect control node to switch ends, then impedance matching is improved, but layout area increases and parasitic capacitance increases
Solution Approach 1:
The patent replaces resistive elements (mechanical/electrical components) with rectifying circuits having high impedance characteristics. This substitution eliminates the need for physical resistors, thereby reducing layout area while maintaining impedance matching through the high impedance nature of the rectifying circuits.
Solution Approach 2:
The patent changes the impedance parameter of the connection between control node and switch ends from low impedance (resistive elements) to high impedance (rectifying circuits). This parameter change reduces parasitic capacitance and layout area while preserving the necessary impedance matching for stable operation.
2Reliability
If resistive elements are used to connect control node to switch ends, then impedance matching is improved, but parasitic capacitance increases
Solution Approach 1:
The patent substitutes resistive elements with rectifying circuits that exhibit high impedance characteristics. This substitution directly reduces parasitic capacitance because the rectifying circuits require minimal physical space and introduce fewer parasitic effects, while still achieving the necessary impedance matching for stable LC resonance operation.
Solution Approach 2:
The patent transforms the impedance parameter from low impedance (resistive) to high impedance (rectifying), which inherently reduces parasitic capacitance. The high impedance characteristic of the rectifying circuits minimizes the harmful parasitic effects while maintaining the required electrical performance.
3Stability of the object's composition
If bias circuits are added to stabilize operation, then stability is improved, but impact on resonance operation increases
Solution Approach 1:
The patent replaces traditional bias circuits with high impedance connections implemented through rectifying circuits. This substitution reduces the loading effect on the resonance circuit because the high impedance minimizes current draw and interference, thereby stabilizing operation while reducing negative impact on resonance performance.
Solution Approach 2:
The patent changes the impedance parameter of the bias connection to high impedance, which reduces the interaction between the bias circuit and the resonance circuit. This parameter change allows the bias circuit to stabilize operation without significantly loading or interfering with the resonance operation.
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
This approach allows for a significant reduction in layout area and equivalent impedance, maintaining oscillation frequency and phase noise performance, while reducing the impact of bias circuits on resonance operations.
Implementation Method 1
a first rectifying circuit electrically connected to the first node with a first polarity, a second rectifying circuit electrically connected to the first node with a second polarity opposite to the first polarity, a third rectifying circuit electrically connected to the second node with the first polarity, and a fourth rectifying circuit electrically connected to the second node with the second polarity
Data Source
AI summary
According to one embodiment, there is provided a semiconductor device including a first switch, a first capacitive element, a second capacitive element, a first rectifying circuit, a second rectifying circuit, a third rectifying circuit, and a fourth rectifying circuit. The first switch is electrically inserted between a first node and a second node. The first capacitive element is electrically inserted between a first signal node and the first node. The second capacitive element is electrically inserted between a second signal node and the second node. The first rectifying circuit is electrically connected to the first node with a first polarity. The second rectifying circuit is electrically connected to the first node with a second polarity opposite to the first polarity. The third rectifying circuit is electrically connected to the second node with the first polarity. The fourth rectifying circuit is electrically connected to the second node with the second polarity.