Transistor Amplifier Finger Tapping for Integrated RF Signal Sampling
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Solution Overview
Problem
Conventional methods for signal sampling in RF power detectors are wasteful of power and silicon area, and can impact impedance matching and limit layout flexibility in multi-stage amplifiers, requiring additional power detector devices and dedicated signal chains.
Innovation Solution
Integration of a power detector within a transistor amplifier stage by tapping a subset of fingers from the transistor's electrode for signal sampling, allowing the same transistor to act as both a power amplifier and detector, reducing the need for separate detection circuits and minimizing area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated signal chain is used to replicate the RF signal path for power detection, then signal sampling accuracy is improved, but power consumption and silicon area increase
Solution Approach 1:
The patent combines the power detection function with the existing RF amplifier stage by utilizing a subset of the amplifier's transistor fingers for sampling. This merging eliminates the need for a separate dedicated signal chain, thereby reducing power consumption while maintaining sampling accuracy through direct tapping of the amplifier's output nodes.
Solution Approach 2:
The RF amplifier stage is designed to serve dual purposes: amplifying the RF signal and providing sampled output for power detection. By making the amplifier multi-functional, the patent eliminates redundant dedicated detection circuits, reducing overall power consumption while maintaining measurement precision through the shared signal path.
2Measurement precision
If a dedicated signal chain is used to replicate the RF signal path for power detection, then signal sampling accuracy is improved, but silicon area increases
Solution Approach 1:
The patent merges the power detection sampling function into the existing RF amplifier structure by using a subset of the amplifier's transistor fingers. This integration eliminates the need for separate dedicated detection circuitry, significantly reducing silicon area while maintaining sampling accuracy through direct node tapping.
Solution Approach 2:
The RF amplifier stage is designed to perform both amplification and power detection sampling functions. This multi-functionality approach allows the same hardware structure to serve multiple purposes, eliminating redundant circuitry and reducing overall silicon area consumption.
3Use of energy by moving object
If a directional coupler or capacitively coupled line is used for signal sampling, then power consumption is reduced, but silicon area increases and impedance matching is affected
Solution Approach 1:
The patent combines the sampling function directly into the amplifier's transistor structure by using a subset of fingers, eliminating the need for external directional couplers or capacitively coupled lines. This integration reduces silicon area while maintaining low power consumption through the inherent efficiency of the shared transistor structure.
4Use of energy by moving object
If a directional coupler or capacitively coupled line is used for signal sampling, then power consumption is reduced, but layout flexibility is limited
Solution Approach 1:
The patent integrates the sampling function directly into the amplifier's transistor structure, allowing the sampling nodes to be positioned wherever the amplifier fingers are located. This integration provides superior layout flexibility compared to external couplers, as the sampling points are inherently distributed across the amplifier structure and can be easily routed to different destinations.
Data Source
AI summary
Embodiments of the invention are generally directed to integration of signal sampling within a transistor amplifier stage. An embodiment of an apparatus includes a amplifier stage including a transistor to receive a source signal and produce an output signal, wherein the transistor includes multiple fingers for at least a first electrode of the transistor. The amplifier stage uses connections to some of the fingers of the first electrode for production of the output signal, and uses one or more other fingers for the first electrode of the transistor for a separate function from the production of the output signal.