Start-Up Decoupling Capacitor Circuit for ESD-Resistant ICs
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Solution Overview
Problem
As gate oxide layers in transistors of integrated circuits become thinner, de-coupling capacitance circuits are at higher risk of electrostatic discharge, leading to potential breakdown and slower circuit initiation due to undetermined gate voltages and increased area requirements for capacitance.
Innovation Solution
The integrated circuit design includes a start-up circuit with voltage generation and control circuits that provide determined initiation voltages to capacitive units, using both P-type and N-type transistors, and multiple electrostatic discharge paths to enhance ESD protection and reduce gate oxide layer vulnerability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gate oxide layers are made thinner to enable high-speed operation, then switching speed is improved, but electrostatic discharge risk increases leading to breakdown
Solution Approach 1:
The patent introduces a start-up circuit as an intermediary component between the power supply and the capacitive units. This circuit includes voltage generation circuits that provide determined initiation voltages to the gates of capacitive units, and control circuits that manage the charging process. The intermediary circuit protects the thin gate oxide layers by controlling voltage application and providing electrostatic discharge paths, thus resolving the contradiction between enabling high-speed operation with thin oxides and preventing electrostatic breakdown.
Solution Approach 2:
The start-up circuit performs preliminary actions by pre-charging the gates of capacitive units before main operation begins. The voltage generation circuits establish determined initiation voltages in advance, and control circuits prepare electrostatic discharge paths beforehand. This preliminary charging and protection mechanism enables the thin gate oxide transistors to operate at high speeds without immediate exposure to damaging electrostatic conditions.
2Stability of the object's composition
If traditional de-coupling capacitance circuits are used, then power supply stabilization is achieved, but circuit initiation is slower due to undetermined gate voltages
Solution Approach 1:
The patent changes the voltage parameter state by providing determined initiation voltages to the gates of capacitive units through voltage generation circuits. Instead of relying on undetermined or floating gate voltages, the system actively sets specific voltage levels (e.g., VDD, VSS, or intermediate levels) before operation. This parameter control enables faster circuit initiation while maintaining power supply stabilization through the capacitive units.
3Stability of the object's composition
If capacitance value is increased for better power stabilization, then power supply stability is improved, but circuit area increases
Solution Approach 1:
The patent changes the operational parameters of capacitive units by providing determined initiation voltages and using both P-type and N-type transistors in the start-up circuit. This enables the capacitive units to achieve higher effective capacitance values through voltage-controlled operation without proportionally increasing physical area. The controlled voltage application optimizes the capacitance utilization of available transistor structures.
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 design enhances ESD protection by increasing breakdown voltage and reducing gate oxide layer breakdown risk, while allowing faster circuit initiation and higher capacitance values in a smaller area, compared to traditional approaches.
Implementation Method 1
De-coupling capacitance circuit is configured as an essential component for stabilization of power supply voltages
Implementation Method 2
the control circuit and the first capacitive unit are configured as an electrostatic discharge path between the first voltage terminal and the second voltage terminal
Data Source
AI summary
An integrated circuit includes a control circuit and first to second voltage generation circuits. The control circuit is coupled between a first voltage terminal providing a first supply voltage and a first node coupled to a first capacitive unit. The first voltage generation circuit includes at least one first transistor that has a source terminal receiving a second supply voltage, a drain terminal coupled to a second node in contact with a second capacitive unit, and a gate terminal coupled to the first node. The second voltage generation circuit is coupled to the first voltage terminal and the first and second nodes. Firstly the control circuit turns on the at least one first transistor to adjust a voltage level of the second node to have the second supply voltage. The second voltage generation circuit adjusts a voltage level of the first node to have the first supply voltage.