Multi-bit ADC with sigma-delta modulation

Details Multi-bit ADC with sigma-delta modulation Multi-bit ADC with sigma-delta modulation

2006-11-28

2006-11-28

Nguyen, Linh (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S172000

Reexamination Certificate

active

07142142

ABSTRACT:
An oximeter uses a sigma-delta modulator and a multi-bit ADC with PWM feedback enabling high precision multi-bit conversion. Demodulation is done in software, thus requiring only a single hardware path for both red and IR. Multiple capacitors are switched into the integrator in the sigma-delta modulator, with different capacitors for red, IR and dark signals, thus enabling the use of the single hardware path. A switching circuit at the input of the sigma-delta modulator acts as a sample and hold, controlled by the PWM feedback.

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