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A 1.5-V-100-μW ΔΣ modulator with 12-b dynamic range using the switched-opamp technique

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3 Author(s)
Peluso, V. ; Katholieke Univ., Leuven, Heverlee, Belgium ; Steyaert, M.S.J. ; Sansen, Willy

The design and implementation of a very low supply voltage/low power ΔΣ modulator is presented. It is based on the switched-opamp technique, which allows low voltage operation with a standard process and without voltage multiplication. The design methodology is illustrated with a second-order single-loop ΔΣ modulator. The chip is implemented in a 0.7-μm CMOS process with standard threshold voltages. The power supply is 1.5 V and the power dissipation is only 100 μW. The measured dynamic range in the speech bandwidth of 300-3400 Hz is 12 b. The total harmonic distortion (THD) is lower than -72 dB

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:32 ,  Issue: 7 )