RT Conference Proceedings
T1 Analysis of in-band spurious tones of VCO-based analog filters and mitigation techniques
A1 Medina Huamán, Víctor Manuel
A1 Loi, Dante
A1 Rombouts, Pieter
A1 Hernández Corporales, Luis
AB Recently VCO-based filters have been used to implement feature extraction in voice recognition systems. Typically implemented filter structures embed the VCOs in a feedback loop. In these implementations, harmonic distortion has been observed in the output signal. This harmonic distortion has been attributed to ring oscillator nonlinearity but its origin stems from a system level problem. In this manuscript we will analyze this problem by looking at the cross modulation of Pulse Frequency Modulation (PFM) side-bands and we will explain how this creates the previously misunderstood harmonic distortion. Moreover, we will propose efficient techniques to mitigate these harmonic components and show that they can easily be implemented in hardware.
PB IEEE
SN 2158-1525
YR 2023
FD 2023-07-21
LK https://hdl.handle.net/10016/37979
UL https://hdl.handle.net/10016/37979
LA eng
NO Proceedings of: 2023 IEEE International Symposium on Circuits and Systems (ISCAS), 21-25 May 2023, Monterey, USA.
NO This paper was supported by program H2020-MSCA-ITN-2020 grant Nr. 956601 and project PID2020-118804RB-I00 of the Spanish Agency of Research (AEI) and by FWO-Vlaanderen.
DS e-Archivo
RD 18 jul. 2024