Non-Uniform Distributed Amplifier for Phase Velocity Compensation
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Solution Overview
Problem
Distributed amplifiers face challenges in achieving a large gain-bandwidth product with high linearity and efficiency due to phase velocity variations and limitations in low-frequency operation, especially in capacitive-coupled designs.
Innovation Solution
A capacitively-coupled non-uniformly distributed amplifier (NDA) is developed with decreasing capacitances and inductances along the output line to compensate for phase velocity variations, using a broadband interface network and tapered gate periphery transconductance devices to maintain linearity and broaden the operating bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If capacitively-coupled distributed amplifier is used to extend gain-bandwidth product, then gain-bandwidth product is improved, but low frequency operation is limited
Solution Approach 1:
The patent applies local quality by using non-uniformly distributed inductive elements along the transmission lines, where the inductance values vary at different positions. Specifically, the inductive elements have different inductance values to compensate for phase velocity variations at different locations along the lines, allowing the amplifier to maintain performance across a wide frequency range including low frequencies.
Solution Approach 2:
The patent changes the parameter distribution of inductive elements from uniform to non-uniform along the transmission lines. By varying the inductance values of the distributed inductive elements according to a specific profile, the amplifier achieves extended gain-bandwidth product while maintaining low frequency operation capability.
2Device complexity
If uniform distributed amplifier is used, then design is simple, but phase velocity variations degrade linearity and efficiency
Solution Approach 1:
The patent transitions from uniform to non-uniform distribution of inductive elements, where each element's inductance is specifically tailored to its position along the transmission line. This local variation compensates for phase velocity variations, improving linearity and efficiency despite increased design complexity.
Solution Approach 2:
The patent incorporates feedback mechanisms where the non-uniform inductive element distribution creates a compensatory effect that counteracts phase velocity variations. The varying inductance values provide a feedback-like correction to maintain constant phase velocity, thereby improving linearity and power added efficiency.
3Reliability
If non-uniform inductive elements are used to compensate for phase velocity variations, then linearity and efficiency are improved, but device complexity increases
Solution Approach 1:
The patent implements local quality by distributing inductive elements with specifically designed non-uniform inductance values along the transmission lines. Each element's inductance is optimized for its local position to compensate for phase velocity variations, achieving improved linearity and efficiency.
Solution Approach 2:
The patent divides the transmission lines into multiple segments with discrete inductive elements rather than using continuous uniform inductance. This segmentation allows for practical implementation of non-uniform distribution while managing device complexity through modular design.
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 solution effectively extends the gain-bandwidth product and operating bandwidth from baseband frequencies to microwave frequencies, while compensating for phase velocity variations and improving efficiency and linearity.
Implementation Method 1
The input network includes a group of capacitive elements coupled between the input line and the DA segments to extend a gain-bandwidth product of the NDA
Implementation Method 2
The output line includes inductive elements, and since the NDA is non-uniformly distributed, an inductance of each inductive element decreases moving from an input end of the output line to an output end of the output line
Data Source
AI summary
The present disclosure relates to a capacitively-coupled non-uniformly distributed amplifier (NDA) having an input line and an output line that are coupled to one another through an input network and DA segments. The input network includes a group of capacitive elements coupled between the input line and the DA segments to extend a gain-bandwidth product of the NDA. The output line includes inductive elements, and since the NDA is non-uniformly distributed, an inductance of each inductive element decreases moving from an input end of the output line to an output end of the output line to compensate for decreasing impedance along the output line. To compensate for phase velocity variations along the output line, a capacitance of each capacitive element that is coupled to the input line decreases moving from an input end of the input line to an output end of the input line.