Abstract
This paper presents a strategy for successful polyphase-filter design for continuous-time quadrature bandpass sigma-delta (SigmaDelta) modulators. Based on a low-pass filter with a chain of integrators with weighted capacitive feedforward summation (CICFF) topology - which is suited for implementation in low-power applications - analytical equations are derived. A new compensation scheme is proposed and implemented by cross-coupling additional resistors, without the necessity of extra-active components. Translation to intermediate frequency in second- and fourth-order polyphase filters with the proposed compensation scheme are compared to analytical considerations and simulation. Nonlinearities introduced by mismatch of feedforward coefficients and finite gain-bandwidth of amplifiers are considered.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IEEE Transactions on Circuits and Systems I: Regular Papers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
