By Topic

A new SC differentiator for two-path bandpass ΔΣ modulator design

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Lei Wang ; Maxim Integrated Products Boston Design Center, Chelmsford, MA, USA ; Embabi, S.H.K.

A new architecture of a fully differential switched capacitor (SC) differentiator is proposed as the building block of two-path bandpass SC ΔΣ modulators. Compared to other SC differentiators, the pole in its transfer function is not sensitive to capacitor mismatches, and there is less switch thermal noise in the new architecture. The opamp in the differentiator has a smaller capacitance load. Using the new SC differentiator, a fully differential fourth-order two-path SC bandpass ΔΣ modulator was built. The signal narrowband of the modulator is 200 kHz centered at 15 MHz. The effective sampling frequency is 60 MHz, double the physical clock frequency. The test circuit was implemented in 0.35-μm CMOS process. The measured signal-to-noise ratio is 77 dB. The power dissipation is 14.5 mW at a 3.0-V supply voltage.

Published in:

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:49 ,  Issue: 11 )