• CTDSM using low noise linear integrator & VCO-based quantizer

• Parasitic insensitive impedance boosting with 4-tap FIR

• Current recycling OPAMP and chopper stabilization for integrator noise reduction

• VCO based quantizer and 2nd order noise shaping for quantization noise reduction

Architecture

• SNDR(Signal to Noise/Distortion Ratio) : 85.1dB at 1kHz BW

• IRN(Input Referred Noise) : 1.4 µV/√Hz at 200Hz(8.5 µV/√Hz at 10kHz)

• CMRR(Common Mode Rejection Ratio) : over 82dB

Performance - SNDR, IRN, CMRR

• Zin(Input Impedance) : over 421MΩ at DC(147MΩ at 1kHz)

Performance - ZIN

Performance - True ExG Acquisition