Symmetric Phase Adjustment Line for Compact Wideband Amplifiers
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Solution Overview
Problem
Conventional amplifier circuits face challenges in miniaturizing wideband signal amplification, as they tend to increase in size when attempting to adjust phase adjustment lines to achieve efficient signal amplification.
Innovation Solution
A semiconductor amplifier circuit design featuring a pre-stage amplifier, a post-stage amplifier, and an inter-stage circuit with a phase adjustment line that is line-symmetric and easily adjustable, allowing for balanced coupling capacitance between transistors and the phase adjustment line, enabling efficient signal amplification without increasing the circuit's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phase adjustment line is made longer to achieve efficient signal amplification and impedance matching, then the signal amplification efficiency is improved, but the circuit size increases
Solution Approach 1:
The phase adjustment line is configured to extend in multiple directions including perpendicular to the first reference line, utilizing two-dimensional space on the circuit board. This allows the line to achieve the necessary length for proper phase adjustment and impedance matching without increasing the linear dimension along the reference line, thus maintaining compact circuit size while ensuring efficient signal amplification
Solution Approach 2:
The phase adjustment line is arranged to pass through or near existing circuit elements such as transistors and reference lines, effectively nesting the phase adjustment function within the existing circuit layout. This nested arrangement allows the phase adjustment line to achieve adequate length for proper operation without requiring additional circuit board area
2Area of stationary object
If the phase adjustment line is made shorter to miniaturize the circuit, then the circuit size is reduced, but the signal amplification efficiency deteriorates
Solution Approach 1:
By extending the phase adjustment line perpendicular to the first reference line and utilizing vertical space on the circuit board, the design achieves adequate line length for proper phase adjustment without increasing the horizontal footprint. This dimensional approach allows circuit miniaturization while maintaining signal amplification efficiency
Solution Approach 2:
The phase adjustment line incorporates adjustable parameters such as line width and length that can be optimized to achieve the desired phase adjustment and impedance matching characteristics. This dynamic design allows the circuit to maintain efficient signal amplification across different operating conditions while keeping the overall circuit size compact
3Ease of manufacture
If the phase adjustment line is configured asymmetrically to simplify layout, then the manufacturing complexity is reduced, but the coupling capacitance balance between transistors deteriorates
Solution Approach 1:
The phase adjustment line is configured with asymmetric elements - specifically, it extends perpendicular to the first reference line from one side, creating an asymmetric layout that simplifies manufacturing while still achieving balanced coupling capacitance through careful positioning and dimensioning of the asymmetric features
Solution Approach 2:
The phase adjustment line employs different line widths in different sections, with the line width varying along its length to compensate for asymmetric positioning. This local variation in line quality (width) allows the asymmetric layout to achieve balanced coupling capacitance between transistors, maintaining signal amplification efficiency while simplifying overall layout
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 design allows for highly efficient signal amplification while miniaturizing the wideband circuit, expanding the usable frequency band and maintaining power efficiency across the desired frequency range.
Implementation Method 1
an inter-stage circuit formed on the circuit board and propagating the amplified signal output from the output terminal of the pre-stage amplifier toward the post-stage amplifier
Implementation Method 2
a matching circuit configured to perform impedance matching between the pre-stage amplifier and the post-stage amplifier
Implementation Method 3
a pre-stage amplifier including a first transistor and a second transistor arranged side by side on the circuit board with a first reference line interposed therebetween, and amplifying an input signal to output an amplified signal
Data Source
AI summary
A semiconductor amplifier circuit includes: a circuit board; a pre-stage amplifier including first and second transistors arranged side by side on the circuit board with a first reference line interposed therebetween; a post-stage amplifier disposed on the circuit board; and an inter-stage circuit formed on the circuit board, in which the inter-stage circuit includes: a phase adjustment line; an internal terminal; and a matching circuit, a first end of the phase adjustment line is connected to the output terminal, and a second end of the phase adjustment line is connected to the internal terminal, an input terminal of the matching circuit is connected to the internal terminal, and an output terminal of the matching circuit is connected to an input terminal of the post-stage amplifier, the first end and the second end are arranged on the first reference line, and the phase adjustment line has a line-symmetric shape.