Distributed Amplifier Integral Bypass for Wideband Gain Control
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Solution Overview
Problem
Conventional wideband distributed amplifiers require external gain control circuitry, leading to increased size, weight, power consumption, and power inefficiencies, as well as signal linearity issues due to additional components in the signal path.
Innovation Solution
An integrated high isolation bypass circuit within the distributed amplifier allows for internal gain control by converting either the input or output transmission line into a bypass line, eliminating the need for external components and minimizing parasitic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external bypass switches or variable attenuators are added to provide gain control, then gain control capability is improved, but device complexity and chip area increase
Solution Approach 1:
The bypass switch is integrated directly into the distributed amplifier circuit structure, merging the bypass function with the existing amplifier components rather than using separate external components. This integration eliminates additional chip area requirements and reduces overall device complexity while maintaining gain control capability
Solution Approach 2:
The transmission lines in the distributed amplifier are designed to serve dual purposes: they function as signal transmission paths during normal amplifier operation and as bypass paths when the bypass switch is activated. This multi-functionality eliminates the need for dedicated external bypass components
2Adaptability or versatility
If external bypass switches or variable attenuators are added to provide gain control, then gain control capability is improved, but size and weight increase
Solution Approach 1:
The bypass functionality is merged into the existing amplifier chip structure using the same transmission line infrastructure and active components. This integration ensures that no additional chip area is required beyond what is already allocated for the distributed amplifier components
Solution Approach 2:
The bypass circuit is nested within the existing amplifier architecture, utilizing the same physical space and components. The bypass switch is positioned to leverage existing transmission line paths, effectively nesting the bypass function within the amplifier's structural framework
3Adaptability or versatility
If external bypass switches or variable attenuators are added to provide gain control, then gain control capability is improved, but power consumption increases
Solution Approach 1:
The bypass switch is designed to completely extract or remove the signal from the power-consuming amplifier path and route it through a passive transmission line bypass path. This extraction ensures that when bypass mode is active, the amplifier components consume minimal or no power while still providing signal transmission
Solution Approach 2:
The bypass switch enables dynamic switching between amplifier mode and bypass mode, allowing the system to periodically alternate between power-consuming operation and low-power bypass operation based on signal requirements, thereby reducing average power consumption
4Adaptability or versatility
If external variable attenuators are added to provide gain control, then gain control capability is improved, but signal linearity deteriorates
Solution Approach 1:
The bypass switch extracts the signal from the non-linear amplifier path and routes it through a passive transmission line bypass path that maintains signal linearity. This extraction ensures that when bypass mode is active, the signal avoids the non-linear distortion introduced by the amplifier components
Solution Approach 2:
The bypass switch acts as an intermediary that selectively routes the signal through either the amplifier path or the passive bypass path. This intermediary function allows the system to maintain signal linearity by choosing the appropriate path based on operational requirements, avoiding the non-linear effects of the amplifier when linearity is critical
Data Source
AI summary
An improved distributed amplifier (200) includes an input transmission line (201) terminated with an input lead configured to accept an input signal and an output transmission line (202) terminated with an output lead configured to output an output signal. A number of parallel amplifier cells (204N) are connected to the input transmission line (201) and the output transmission line (202) that collectively amplify the input signal from the input lead to produce an amplified output signal at the output lead. A bypass switch (212, 300) is connected to the input and output transmission lines (201, 202). The bypass switch (212, 300) is operative to convert either the input transmission line (201, 301) or the output transmission line (202, 302) into a bypass line configured to bypass the parallel amplifier cells (204N) of the distributed amplifier (200) and provide a direct path between the input and output transmission lines (201, 202) to produce a bypassed output signal at the output lead.