Dynamic Amplifier Resistive Feedback for Stable High-Resolution ADCs
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Solution Overview
Problem
Existing dynamic amplifiers in electronic systems face challenges with stability, particularly in high-resolution analog digital converters like pipeline ADC, SAR ADC, and delta sigma modulation ADC, which require high linearity and low power operation.
Innovation Solution
The implementation of a dynamic amplifier design that includes specific configurations of NMOS transistors and resistors to generate multiple outputs based on input signals, enhancing stability through resistive feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dynamic amplifier designs are used, then the amplifier can operate with low power and high linearity, but the stability is insufficient and phase margins are not secured
Solution Approach 1:
The patent applies feedback by connecting resistors from output nodes back to input nodes, creating feedback paths that stabilize the amplifier operation. Specifically, first and second resistors connect from first and second output nodes to first and second input nodes respectively, providing negative feedback that secures phase margins and improves stability without requiring complex additional circuits
Solution Approach 2:
The resistors in the patent serve multiple functions simultaneously: they provide feedback for stability, set gain values, and influence output impedance. This multi-functionality allows the amplifier to achieve improved stability without adding separate dedicated stability circuits, thereby avoiding increased device complexity
2Reliability
If the amplifier uses simple resistor connections, then the device complexity is low, but the output impedance is insufficient and phase margins are not secured
Solution Approach 1:
The feedback configuration using resistors connected between output and input nodes creates stable operating conditions and secures adequate phase margins. The feedback paths allow the amplifier to maintain stability across varying conditions without requiring complex compensation circuits
Solution Approach 2:
The patent utilizes parameter changes by adjusting resistor values to optimize amplifier performance. By selecting appropriate resistance values for the feedback resistors, the gain, output impedance, and phase margins can be tuned to achieve desired stability without increasing structural complexity
3Reliability
If multiple sub-dynamic amplifiers are used to improve performance, then the stability and output impedance are enhanced, but the device complexity increases
Solution Approach 1:
The resistors in the circuit perform multiple functions including feedback, gain setting, and output impedance enhancement. This multi-functionality allows a single amplifier stage with properly configured resistors to achieve stability improvements that would otherwise require multiple amplifier stages, thereby avoiding increased device complexity
Data Source
AI summary
An amplifier and an electronic system including the same are provided. An amplifier includes a first NMOS transistor configured to receive a first input, a second NMOS transistor configured to receive a second input, the second NMOS transistor including a source connected to a source of the first NMOS transistor, a first resistor including a first end connected to a drain of the first NMOS transistor and a second end connected to a first output, a second resistor including a first end connected to a drain of the second NMOS transistor, and a second end connected to a second output, and the amplifier is configured to generate the first output and the second output based on the first input, the second input, a resistance value of the first resistor, and a resistance value of the second resistor.