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Single-Chip Implementation of Level-Crossing ADC for ECG sampling

Journal article
Authors Lars Bengtsson
Published in Journal of Electrical & Electronic Systems
Volume 6
Issue 1
ISSN 2332-0796
Publication year 2017
Published at Department of Physics (GU)
Language en
Keywords Asynchronous sampling; Core-independent peripherals; Electrocardiogram; Level-crossing ADC; Microcontroller; Nyquist sampling; Overload distortions; Sparse signals; Synchronous ADC, Threshold levels
Subject categories Embedded Systems, Signal Processing, Electronics, Computer Systems, Medical technology


This work demonstrates for the first time the implementation of a level-crossing analog-to-digital converter (LC-ADC) in a single, commercially available IC (that costs less than $2). The implementation utilizes adaptive threshold levels in order to prevent overload distortions for fast-changing signals. The entire design is based on a 20-pin PIC16F1769 microcontroller from Microchip and no external components are required. In fact, the only external circuitry required is a single jumper wire. This is due to the fact that the new generation of microcontrollers have integrated core-independent hardware, analog as well as digital. This design takes full advantage of the core-independent logic and analog blocks in a PIC16F17xx circuit to implement the LC-ADC technique that so far has required multiple-circuit designs or ASIC implementation. The design is demonstrated on a standard electrocardiogram (ECG) signal.

Page Manager: Webmaster|Last update: 9/11/2012

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