A novel low order delta–sigma modulator without harmonic distortion

Nowadays, the technology advancements of signal processing, low-voltage low-power circuits and miniaturized circuits have enabled the design of compact, battery-powered, high performance solutions for a wide range of, particularly, biomedical applications. Novel sensors for human biomedical signals are creating new opportunities for low weight wearable devices which allow continuous monitoring together with freedom of movement of the users. This paper presents the design and implementation of a novel miniaturized low-power sensor in integrated circuit (IC) form suitable for wireless electromyogram (EMG) systems. Signal inputs (electrodes) are connected to this application-specific integrated circuit (ASIC). The ASIC consists of several consecutive parts. Signals from electrodes are fed to an instrumentation amplifier (INA) with fixed gain of 50 and filtered by two filters (a low-pass and high-pass filter), which remove useless signals and noise with frequencies below 20 Hz and above 500 Hz. Then signal is amplified by a variable gain amplifier. The INA together with the reconfigurable amplifier provide overall gain of 50, 200, 500 or 1250. The amplified signal is then converted to pulse density modulated (PDM) signal using a 12-bit delta-sigma modulator. The ASIC is fabricated in TSMC0.18 mixed-signal CMOS technology.

show abstract

“…1, consists of several circuits, which are described below. The ASIC takes advantage of novel modulator proposed in [8].…”

Section: Application-specific Integrated Circuit(asic)designmentioning

confidence: 99%

“…Low-order delta-sigma modulators also suffer from harmonic tones in the output spectrum, which can significantly reduce the achieved SNDR. Due to this reason the system takes advantage of our novel delta-sigma modulator topology presented in [8].…”

Section: Delta-sigma Modulatormentioning

confidence: 99%