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Continuous-time common-mode feedback for high-speed switched-capacitor networks

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2 Author(s)
Hernandez-Garduno, D. ; Analog & Mixed-Signal Center, Texas A&M Univ., College Station, TX, USA ; Silva-Martinez, J.

This paper deals with the design of a continuous-time common-mode feedback (CMFB) for switched-capacitor networks. Its reduced input capacitance decreases the capacitive load at the output of the fully differential amplifier, improving its achievable gain-bandwidth (GBW) product and slew rate. This topology is more suitable for high-speed switched-capacitor applications when compared to a conventional switched-capacitor CMFB, enabling operation at higher clock frequencies. Additionally, it provides a superior rejection to the negative power supply noise (PSRR-). The performance of the CMFB is demonstrated in the implementation of a second-order 10.7-MHz bandpass switched-capacitor filter and compared with that of an identical filter using the conventional switched-capacitor CMFB (SC-CMFB). The filter using the continuous-time CMFB reduces the error due to finite GBW and slew rate to less than 1% for clock frequencies up to 72 MHz while providing a dynamic range of 59 dB and a PSRR->22 dB. Both circuits were fabricated in 0.35-μm CMOS technology.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:40 ,  Issue: 8 )