ADC Clock Frequency Modulation for Noise-Resistant Sampling
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Solution Overview
Problem
Analog-to-digital converters face accuracy issues due to offset during sampling and quantization errors, and are susceptible to noise interference, which affects their performance.
Innovation Solution
An analog-to-digital converter with an adjustable operation frequency, comprising a clock generator, clock controller, counter, sample and hold circuit, quantizer, and stable processor, which allows for frequency adjustment and noise suppression through modulation and filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operating frequency of the analog-to-digital converter is fixed, then the circuit structure is simple, but the noise resistance is poor and signal accuracy is affected
Solution Approach 1:
The patent implements dynamic frequency adjustment by introducing a clock controller that modifies the sampling frequency based on signal characteristics and noise conditions. The system transitions from a fixed-frequency architecture to a dynamically adaptable one, where the sampling rate can be adjusted in real-time to optimize noise resistance while maintaining circuit simplicity through controlled complexity in the clock control module.
Solution Approach 2:
The patent changes the operating parameter (sampling frequency) of the analog-to-digital converter to improve noise resistance. By varying the sampling frequency according to signal characteristics and noise conditions, the system achieves better signal-to-noise ratio and accuracy without requiring a complete redesign of the entire converter architecture.
2Measurement precision
If the sampling frequency is adjusted to reduce noise, then the signal accuracy improves, but the device complexity increases due to additional control circuits
Solution Approach 1:
The clock controller is designed to perform multiple functions: it monitors signal characteristics, determines optimal sampling frequencies, generates adjusted clock signals, and controls the timing of the analog-to-digital conversion process. By consolidating these functions into a single multi-functional control unit, the patent reduces overall device complexity compared to having separate circuits for each function.
Solution Approach 2:
The system implements feedback mechanisms where the output signal characteristics are monitored and used to adjust the sampling frequency in real-time. This closed-loop control allows the system to automatically optimize signal accuracy without requiring complex external control circuits, as the feedback information is processed within the existing control architecture.
3Measurement precision
If a fixed sampling frequency is used, then the device complexity is low, but the quantization error and offset affect converter accuracy
Solution Approach 1:
The patent employs periodic variation of the sampling frequency to reduce the impact of quantization error and offset. By modulating the sampling rate periodically or dynamically, the system distributes quantization errors across different frequency domains, preventing their accumulation and improving overall conversion accuracy without requiring complex error correction circuits.
Data Source
AI summary
Disclosed is an analog-to-digital converter with an adjustable operation frequency for noise reduction. The operation frequency of the analog-to-digital converter is adjustable, and if an input signal or a circuit is affected by a noise, the noise can be reduced by spreading the frequency distribution of the noise. A clock generator generates a clock signal for controlling the operation frequency of the analog-to-digital converter. Additionally, a clock controller receives a setting signal and a counting signal, controls the clock generator, and adjusts the frequency of the clock signal. In addition, a counter counts the number of periods of the clock signal, and generates the counting signal. Furthermore, a selecting signal makes the frequency of the clock signal gradually increase or decrease with time, thereby allowing change rate or change amount of the frequency of the clock signal to be adjustable.