Semiconductor Shield Drive Circuit Parasitic Capacitance
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Solution Overview
Problem
Existing semiconductor devices face challenges in reducing power consumption while minimizing signal blunting due to parasitic capacitance in signal transmission lines, which is exacerbated by increased current capacity required to alleviate signal blunting.
Innovation Solution
A semiconductor device configuration that includes a shield line and shield drive circuit to control voltage on the shield line, using a transistor and constant-current circuit to transfer electric charge commensurate with the target voltage signal, thereby reducing parasitic capacitance and maintaining signal integrity with lower amplifier current capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current capacity of the amplifier is increased to alleviate signal blunting caused by parasitic capacitance, then signal integrity is improved, but power consumption increases
Solution Approach 1:
A shield line is introduced as an intermediary element between the signal line and ground. The shield line is controlled by a shield drive circuit that transfers electric charge commensurate with the target voltage signal, thereby reducing the parasitic capacitance effect on the signal line without requiring increased amplifier current capacity
Solution Approach 2:
The invention changes the voltage parameter of the shield line dynamically based on the target voltage signal. By adjusting the shield line voltage to match the signal voltage, the electric field distribution is optimized, reducing parasitic capacitance effects while maintaining low power consumption in the amplifier
2Reliability
If a passive element (resistor and capacitor) is connected to the signal line to compensate for parasitic capacitance, then signal transmission is improved, but additional parasitic capacitance is introduced
Solution Approach 1:
The shield line acts as an intermediary that actively compensates for parasitic capacitance effects without introducing additional passive elements. By controlling the shield line voltage dynamically, the system achieves signal transmission improvement without the drawback of additional parasitic capacitance from resistors and capacitors
3Reliability
If the amplifier current capacity is increased to drive the signal line, then signal blunting is reduced, but circuit current and power consumption increase
Solution Approach 1:
The shield drive circuit serves as an intermediary that handles the charge transfer requirements, allowing the amplifier to operate at lower current capacity. The shield line absorbs the burden of compensating for parasitic capacitance, freeing the amplifier from needing high current capacity
Solution Approach 2:
The shield line system provides self-service by automatically adjusting its voltage based on the target voltage signal through the shield drive circuit. This automatic charge transfer mechanism reduces the burden on the amplifier, allowing it to maintain signal transmission quality with lower power consumption
Data Source
AI summary
A semiconductor device includes an amplifier that has an output terminal and that outputs via the output terminal a signal commensurate with an input signal fed to the amplifier, a signal conductor that is connected to the output terminal and that conducts a target voltage signal based on the output signal of the amplifier, a shield conductor that is laid along the signal conductor, and a shield drive circuit that controls the voltage on the shield conductor based on the target voltage signal.