Integrated Gate Resistor-Capacitor Layout for Common-Gate Amplifiers
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Solution Overview
Problem
Single-stage field-effect transistor amplifiers, particularly common-gate amplifiers, require large-sized capacitors, which occupy significant space and increase the overall size of semiconductor devices.
Innovation Solution
Integrating a resistor and capacitor within a semiconductor device by utilizing the gate as both a resistor and the top electrode of the capacitor, with an oxide layer as the insulation layer, reducing the physical size by combining these components into a single structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common-gate amplifier uses a large-sized capacitor, then the capacitor can provide sufficient capacitance for the amplifier operation, but the overall device size increases significantly
Solution Approach 1:
The patent merges the capacitor with the transistor structure by using the transistor's source region as the capacitor electrode and the substrate as the other electrode, eliminating the need for a separate large-sized capacitor while maintaining sufficient capacitance for amplifier operation
Solution Approach 2:
The source region serves dual functions: as the input terminal of the common-gate amplifier and as one electrode of the capacitor, allowing the same structure to fulfill multiple circuit functions and reduce overall device area
2Adaptability or versatility
If separate resistor and capacitor components are integrated into the semiconductor device, then the device functionality is enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the resistor and capacitor into a single integrated structure where the gate serves as the resistor and the capacitor is formed using the source region and substrate, reducing the number of discrete components while maintaining enhanced functionality
Solution Approach 2:
The gate structure serves multiple functions simultaneously: as the resistive element for biasing, as the top electrode of the capacitor, and as the control terminal for the transistor, thereby enhancing device functionality without proportionally increasing complexity
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 integrated design minimizes the area and volume occupied by the resistor and capacitor, leading to a smaller semiconductor device with reduced costs and enhanced performance in radio frequency circuits.
Implementation Method 1
an oxide layer disposed between the gate and the substrate
Implementation Method 2
The doped regions are disposed in the first well and are connected to the ground
Data Source
AI summary
A semiconductor device including a resistor and a capacitor is provided. The capacitor includes a top electrode and a bottom electrode. The semiconductor device further includes a substrate, a first well, at least two doped regions, at least one gate and at least one oxide layer. The substrate serves as the bottom electrode of the capacitor. The first well is disposed in the substrate. The doped regions are disposed in the first well and are connected to the ground. The gate is disposed in the substrate and serves as the resistor and the top electrode of the capacitor. The oxide layer is disposed between the gate and the substrate.