Reconfigurable Amplifier Switching Cascode for Loading and Efficiency
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Solution Overview
Problem
Existing amplifiers face challenges in achieving high performance and power efficiency in both combining and multiplexing modes due to loading effects, with cascode amplifiers mitigating loading in combining but reducing power efficiency in multiplexing.
Innovation Solution
A reconfigurable amplifier that can operate in cascode or non-cascode modes, using a gate control circuit and supply control circuit to switch between these modes, allowing high output impedance for loading mitigation in combining mode and high power efficiency in multiplexing mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cascode amplifier configuration is used, then loading effects are mitigated in combining mode, but power efficiency deteriorates in multiplexing mode
Solution Approach 1:
The amplifier dynamically switches between cascode and non-cascode configurations based on operating mode. In combining mode, the cascode configuration is activated to mitigate loading effects between LNAs. In multiplexing mode, the non-cascode configuration is activated to improve power efficiency. This dynamic reconfiguration allows the system to optimize performance metrics according to the specific operational requirements.
Solution Approach 2:
The invention changes the circuit configuration parameters by selectively enabling or disabling specific transistors and control signals. The gate control circuit adjusts the operating state of the second transistor in the cascode pair, transitioning between saturation region (for cascode mode) and other operating regions (for non-cascode mode), thereby changing the electrical characteristics to suit different operational modes.
2Adaptability or versatility
If reconfigurable amplifier is used with mode switching, then both combining and multiplexing performance are optimized, but device complexity increases
Solution Approach 1:
The amplifier is designed with multi-functionality to perform both combining and multiplexing operations using the same hardware infrastructure. The cascode pair and associated transistors can operate in different configurations depending on the mode, eliminating the need for separate amplifier circuits for each function and reducing overall system complexity despite the added control logic.
Data Source
Figure 1A~1B
Figure 1C
Figure 2A
AI summary
A reconfigurable amplifier includes a first transistor having a gate coupled to an input of the reconfigurable amplifier, and a source coupled to a ground. The reconfigurable amplifier also includes a gate control circuit, and a second transistor having a gate coupled to the gate control circuit, a source coupled to a drain of the first transistor, and a drain coupled to an output of the reconfigurable amplifier, wherein the gate control circuit is configured to output a bias voltage to the gate of the second transistor in a cascode mode, and output a switch voltage to the gate of the second transistor in a non-cascode mode. The reconfigurable amplifier further includes a load coupled to the output of the reconfigurable amplifier.