Low Power Biomedical Signal Acquisition using Frequency Modulation and Frequency Domain Multiplexing
- Author(s): Warchall, Julian
- Advisor(s): Mercier, Patrick P
- et al.
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.