A 4th-order single-loop Follow-the-Leader-Feedback (FLFB) low-pass filter is hereby presented. The outstanding FLFB noise behavior has been exploited to release a specific power budget for linearity performance enhancement. Moreover, two pairs of complex poles are synthesized by using a single compact Active-RC cell, avoiding cascade of two or more stages (typically needed for high order filters), and relaxing this way noise power constraints. A prototype of the filter has been integrated in CMOS 0.18μm technological node, having 22.5MHz -3dB low-pass frequency. 21.5dBm in-band IIP3 and 76μVRMS input referred in-band integrated noise have been achieved. The SNR for a -40dB-THD is 69dB. The power consumption is 7mA. The efficiency of the hereby proposed technique is demonstrated by the very high Figure-of-Merit (160J-1) achieved by the FLFB filter comparing with the Active-RC filters state-of-the-art.
Pipino, A., DE MATTEIS, M., Pezzotta, A., Resta, F., D'Amico, S., Baschirotto, A. (2016). A 22.5MHz 21.5dBm-IIP3 4th-Order FLFB analog filter. In European Solid-State Circuits Conference (pp.289-292). IEEE Computer Society [10.1109/ESSCIRC.2016.7598299].
A 22.5MHz 21.5dBm-IIP3 4th-Order FLFB analog filter
PIPINO, ALESSANDRAPrimo
;DE MATTEIS, MARCELLOSecondo
;PEZZOTTA, ALESSANDRO;RESTA, FEDERICA;BASCHIROTTO, ANDREAUltimo
2016
Abstract
A 4th-order single-loop Follow-the-Leader-Feedback (FLFB) low-pass filter is hereby presented. The outstanding FLFB noise behavior has been exploited to release a specific power budget for linearity performance enhancement. Moreover, two pairs of complex poles are synthesized by using a single compact Active-RC cell, avoiding cascade of two or more stages (typically needed for high order filters), and relaxing this way noise power constraints. A prototype of the filter has been integrated in CMOS 0.18μm technological node, having 22.5MHz -3dB low-pass frequency. 21.5dBm in-band IIP3 and 76μVRMS input referred in-band integrated noise have been achieved. The SNR for a -40dB-THD is 69dB. The power consumption is 7mA. The efficiency of the hereby proposed technique is demonstrated by the very high Figure-of-Merit (160J-1) achieved by the FLFB filter comparing with the Active-RC filters state-of-the-art.
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