Adaptive Analog Biasing for Variable Sampling Rate Circuits
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Solution Overview
Problem
Battery-operated mixed signal devices face challenges in reducing energy consumption, particularly in the analog circuit, as existing technologies focus more on digital circuit energy reduction without effectively addressing the dynamic adjustment of sampling rates and bias currents in response to changing signal frequencies.
Innovation Solution
A mixed signal device with a digital circuit that dynamically adjusts its sampling rate and corresponding bias current for the analog circuit based on changes in sampling frequency, using a look-up table to map sampling frequencies to optimal bias current values, thereby reducing energy consumption by scaling analog power with signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the sampling rate in the digital circuit is increased to improve signal processing capability, then the processing speed and accuracy are improved, but the energy consumption of the analog circuit increases due to higher bias current requirements
Solution Approach 1:
The patent implements dynamic adjustment of the analog circuit's bias current based on the digital circuit's sampling rate. A control mechanism monitors the sampling rate and automatically adjusts the bias current to match the actual processing requirements, transforming the static power consumption system into a dynamic one that adapts to changing operational conditions.
Solution Approach 2:
The patent changes the bias current parameter of the analog circuit in response to sampling rate variations. By mapping sampling rate levels to corresponding bias current levels, the system optimizes power consumption while maintaining signal processing quality, directly addressing the energy-speed tradeoff.
2Reliability
If the bias current of the analog circuit is increased to improve signal processing quality, then the processing capability is improved, but the energy consumption increases
Solution Approach 1:
The system dynamically adjusts bias current based on actual sampling rate requirements rather than maintaining a fixed high bias current. This dynamic adaptation ensures signal processing quality is maintained only when needed, reducing energy consumption during low-demand operations.
Solution Approach 2:
The patent implements a feedback mechanism where the digital circuit's sampling rate information is used to control the analog circuit's bias current. This closed-loop control ensures that bias current is optimized according to actual processing needs, balancing quality and energy consumption.
3Adaptability or versatility
If the sampling rate is dynamically variable to adapt to different signal frequencies, then the adaptability is improved, but the complexity of controlling bias current increases
Solution Approach 1:
The patent makes the bias current dynamic and adaptable to matching the variable sampling rate. This dynamic configuration enables the system to adapt to different signal frequencies and processing requirements without requiring complex manual intervention or control logic.
Data Source
AI summary
A mixed signal device includes an analog circuit and a digital circuit coupled to the analog circuit. The digital circuit includes a component that samples a signal at a sampling rate that is dynamically variable by the digital circuit based on the bandwidth of the incoming signal. The digital circuit is to automatically assert a signal to the analog circuit to change a bias current of the analog circuit based on a change to the sampling rate in the digital circuit.