Time-Multiplexed Residue Amplifier With Accurate Attenuator Matching
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Solution Overview
Problem
High-performance analog-to-digital converters face stringent accuracy requirements for interstage amplifiers, leading to tradeoffs that degrade system performance in terms of speed, noise, and power, due to the need for precise gain accuracy in amplifiers to maintain accurate residue amplification across stages.
Innovation Solution
A time-multiplexed system using a low accuracy amplifier and a high accuracy attenuator, where the same amplifier gain is applied to both signal and residue paths in alternating time periods, relaxing the accuracy constraints on the amplifier and maintaining proportional output ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high accuracy amplifier is used to maintain accurate residue amplification, then amplifier gain accuracy is improved, but system complexity and power consumption increase
Solution Approach 1:
The patent applies periodic action by time-multiplexing the amplifier between two distinct operational modes: a first mode where the amplifier operates with high gain accuracy to amplify the residue signal, and a second mode where the amplifier operates with reduced accuracy requirements while processing the reference signal. This periodic switching allows the system to achieve accurate residue amplification only when needed, while reducing complexity and power consumption during the alternate phase.
2Measurement precision
If high accuracy amplifier is used to maintain accurate residue amplification, then amplifier gain accuracy is improved, but system power consumption increases
Solution Approach 1:
The patent implements periodic action through time-multiplexed operation where the amplifier alternates between a first time period with high gain accuracy for residue signal amplification and a second time period with reduced accuracy for reference signal processing. This periodic switching enables the system to consume high power only during the brief interval when accurate residue amplification is required, while operating at lower power during the alternate phase, thereby reducing overall power consumption.
3Measurement precision
If high accuracy amplifier is used to maintain accurate residue amplification, then amplifier gain accuracy is improved, but system speed decreases
Solution Approach 1:
The patent applies periodic action by time-multiplexing the amplifier between a first time period where high gain accuracy is maintained for residue signal amplification and a second time period where the amplifier operates with reduced accuracy requirements. This periodic operation allows the system to achieve accurate conversion during the first phase while enabling faster, lower-accuracy operation during the second phase, thereby improving overall conversion speed without sacrificing the accuracy needed for the critical residue amplification function.
Data Source
AI summary
A system is configured and a method is provided for receiving an input ratio represented by a first input signal and a second input signal, and producing an output ratio represented by a first output signal and a second output signal. The system is constructed and the method is provided for alternately operating in at least two time periods, wherein in one time period the first input signal, a low accuracy amplifier, and the first output signal are selectively coupled, and in another time period the input signal, the low accuracy amplifier, a high accuracy attenuator, and the second output signal are selectively coupled so as to maintain the output ratio proportional to the input ratio.