A 678- $\mu$ W Frequency-Modulation-Based ADC With 104-dB Dynamic Range in 44-kHz Bandwidth

This brief presents a frequency-modulation-based analog-to-digital converter (FM ADC) that takes advantage of the coding gain resulting from bandwidth expansion in the analog domain of FM systems to achieve high dynamic range and incorporates a highly digital demodulation approach for power efficiency. The novel architecture employs a sinusoidal output voltage-controlled oscillator (VCO), a relati...