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Low Power Biomedical Signal Acquisition using Frequency Modulation and Frequency Domain Multiplexing


A scheme for the sampling and quantization of voltages over time in an integrated

circuit chip is presented based on first frequency modulating the signal of interest

and then sampling and quantizing its frequency modulated representation. When

a single input signal is considered and demodulation to recover the original signal is

performed on the same chip as modulation, the resulting structure is an FM-ADC as

discussed in Chapter 2. The recording of multiple input signals using multiple frequency

modulating chips and frequency domain multiplexing combined with demodulation

off-chip is referred to as a distributed multi-channel FM-ADC with demodulation

offloading, and is discussed in Chapter 3 as applied to biopotential signal acquisition as

it offers unique advantages in that application space. Chapter 4 deals with theoretical

optimization of the FM-ADC in both its single-channel and multi-channel forms.

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