Transistor Oscillation Suppression via Segmented Drain Pad
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Solution Overview
Problem
Conventional transistors with resistors in the drain pad suffer performance deterioration and resistor damage due to nonuniform operation at high frequencies, leading to oscillation suppression inefficiencies and potential resistor damage.
Innovation Solution
A transistor design featuring a semiconductor substrate with gate, source, and drain electrodes, a drain pad connected to drain electrodes, metal wiring adjacent and parallel to the drain pad forming a capacitor, and ground pads connected to the metal wiring with a resistor, which generates loss only at resonance frequencies to suppress oscillation without affecting performance or damaging the resistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistor is formed inside the drain pad to suppress resonance and oscillation, then oscillation is suppressed, but performance deteriorates at high frequencies and the resistor may be damaged
Solution Approach 1:
The invention divides the oscillation suppression function from the power transmission path by placing the resistor in a separate metal wiring adjacent to the drain pad, rather than inside the drain pad itself. This segmentation allows the resistor to suppress oscillations while the drain pad maintains its full conductivity for signal transmission, eliminating the trade-off between oscillation suppression and signal loss.
Solution Approach 2:
The invention introduces a metal wiring as an intermediary element between the drain pad and ground pad, with the resistor placed in this intermediary path. This intermediary structure provides a dedicated path for oscillation current while keeping the main power transmission path through the drain pad unaffected, thus suppressing oscillations without causing signal loss.
2Reliability
If a resistor is formed inside the drain pad to suppress oscillation, then oscillation is suppressed, but the resistor may be damaged by large AC currents at high frequencies
Solution Approach 1:
The invention segments the current paths by placing the resistor in a separate metal wiring adjacent to the drain pad. This segmentation ensures that large AC currents generated during nonuniform operation flow through the drain pad and metal wiring structure rather than through the resistor, protecting the resistor from damage while maintaining oscillation suppression capability.
Solution Approach 2:
The metal wiring structure serves as an intermediary that handles the high current stress during nonuniform operation, protecting the resistor from direct exposure to damaging currents. The resistor in the adjacent metal wiring suppresses oscillations without being subjected to the large AC currents that would otherwise flow through a resistor placed inside the drain pad.
3Reliability
If the drain pad is used for both power supply and oscillation suppression, then oscillation is suppressed, but performance deteriorates due to nonuniform operation at high frequencies
Solution Approach 1:
The invention segments the functions of power supply and oscillation suppression into separate structures: the drain pad handles power supply uniformly across all transistor cells, while a separate adjacent metal wiring with resistor handles oscillation suppression. This segmentation prevents the nonuniform operation at high frequencies from affecting the resistor, maintaining both power addition efficiency and oscillation suppression.
Solution Approach 2:
The invention introduces an adjacent metal wiring as an intermediary structure that provides oscillation suppression without interfering with the uniform power supply function of the drain pad. This intermediary structure allows the drain pad to maintain its full effectiveness for power transmission while independently suppressing oscillations, thus maintaining high power addition efficiency.
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
Effectively suppresses oscillation without performance deterioration or resistor damage across various frequencies, including high output scenarios, by converting electric energy to thermal energy only at resonance frequencies, thus maintaining efficiency and preventing resistor damage.
Implementation Method 1
An AC current flows through the resistor 13 inside the drain pad 7 and electric energy of 17 GHz is converted to thermal energy
Implementation Method 2
a metal wiring 10 on the semiconductor substrate 1 and arranged spaced apart from, adjacent to and parallel to the drain pad 7
Data Source
AI summary
A transistor includes: a semiconductor substrate; a plurality of gate electrodes, a plurality of source electrodes, and a plurality of drain electrodes on the semiconductor substrate; a drain pad on the semiconductor substrate and connected to the plurality of drain electrodes; a metal wiring on the semiconductor substrate and arranged spaced apart from, adjacent to and parallel to the drain pad; and a ground pad on the semiconductor substrate and connected to both ends of the metal wiring.