Details

Autor(en) / Beteiligte

• Martincorena-Arraiza, Maite
• De La Cruz-Blas, Carlos A.
• Lopez-Martin, Antonio
• Carlosena, Alfonso

Titel

Micropower Class AB Low-Pass Analog Filter Based on the Super-Source Follower

Ist Teil von

• IEEE transactions on circuits and systems. II, Express briefs, 2022-09, Vol.69 (9), p.3684-3688

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2022

Quelle

IEEE Xplore

Beschreibungen/Notizen

• An improved class AB version of the super source follower is used to implement a compact and power-efficient second order analog low-pass filter. The proposed circuit achieves a 41% power reduction as well as an improvement in linearity and pass band gain with respect to its class A counterpart. Measurement results of a test chip prototype fabricated in a 180 nm CMOS technology show a power consumption ranging from 50.3 <inline-formula> <tex-math notation="LaTeX">\mu \text{W} </tex-math></inline-formula> to 85.27 <inline-formula> <tex-math notation="LaTeX">\mu \text{W} </tex-math></inline-formula> for cutoff frequencies from 600 kHz to 890 kHz, with a supply voltage of ±0.75 V. A third order intermodulation distortion of −35.34 dB (for an input signal of 0.4 mV pp and 350 kHz) and a THD of −69.7 dB (for an input signal of 0.4 mV pp and 100 kHz) are measured, which results in an improvement with respect to the conventional class A version of 13.98 dB and 43.6 dB, respectively. The silicon area is 0.0592 mm 2 (using external capacitors).