Journal ArticleDOI
Active-RC Filters Using the Gm-Assisted OTA-RC Technique
TLDR
The Gm-assisted OTA-RC technique is explored, which is a way of combining GM-C and active-RC integrators in a manner that enhances the linearity and speed of the latter, while adding negligible extra noise or power dissipation.Abstract:
The linearity of conventional active-RC filters is limited by the operational transconductance amplifiers (OTAs) used in the integrators. Transconductance-capacitance (Gm-C) filters are fast and can be linear- however, they are sensitive to parasitic capacitances. We explore the Gm-assisted OTA-RC technique, which is a way of combining Gm-C and active-RC integrators in a manner that enhances the linearity and speed of the latter, while adding negligible extra noise or power dissipation. Measurements from a fifth-order Chebyshev filter with 20 MHz bandwidth, designed in a 0.18 μ m CMOS process, demonstrate the efficacy of Gm-assistance in an active-RC integrator.read more
Citations
More filters
Journal ArticleDOI
Highly Power-Efficient Active-RC Filters With Wide Bandwidth-Range Using Low-Gain Push-Pull Opamps
TL;DR: A generic-purpose solution of highly power-efficient active-RC filters, suitable for analog baseband with wide bandwidth-range from several mega- Hz to hundreds of mega-Hz in wireless receivers, and the GBW compensation and the Q-degrading scheme are adopted to relax the opamp GBW requirement, further reducing the power dissipation.
Journal ArticleDOI
Design and Analysis of Enhanced Mixer-First Receivers Achieving 40-dB/decade RF Selectivity
TL;DR: A “second-order” passive mixer-first receiver is proposed to improve channel selectivity, linearity, and noise figure (NF) in the presence of out-of-band blockers, by presenting an impedance that rolls off at 40 dB/decade as the load to an N-path filter.
Journal ArticleDOI
Design Techniques for Continuous-Time ΔΣ Modulators With Embedded Active Filtering
Radha S. Rajan,Shanthi Pavan +1 more
TL;DR: Measurements of a CTDSM with a built-in VGA and a second order Butterworth filter show that the in-band/out-of-band IIP 3 improves by about 3/10 dB when compared to the filter-CTDSM cascade, and achieves a similar dynamic range and consumes 25% lower power.
Journal ArticleDOI
A Biquadratic Cell Based on the Flipped-Source-Follower Circuit
TL;DR: This brief presents a novel biquadratic cell (biquad) based on the flipped-source-follower (FSF) circuit, taking advantage of its well-known strengths, like low-output impedance, low-noise, large in-band linearity, and low power.
Journal ArticleDOI
Switched-Mode Operational Amplifiers and Their Application to Continuous-Time Filters in Nanoscale CMOS
TL;DR: A new class of feedback amplifiers, called switched-mode operational amplifiers (SMOAs) that address voltage-swing limitations of classical feedback amplifier in scaled CMOS technologies, and provide near-rail-to-rail output-signal swing, high output-stage efficiency and better linearity are introduced.
References
More filters
Book
Distortion analysis of analog integrated circuits
Piet Wambacq,Willy Sansen +1 more
TL;DR: General techniques to suppress nonlinear behavior such as pre-distortion, linear and nonlinear feedback are explained in detail and illustrated with realistic examples to fill the gap between the theory of nonlinear systems and practical analog integrated circuits.
Journal ArticleDOI
Analysis of nonlinear systems with multiple inputs
TL;DR: Analytical modeling of communication receivers to account for their nonlinear response to multiple input signals is discussed, based on the application of the Wiener-Volterra analysis of nonlinear functionals.
Journal ArticleDOI
Integrated continuous-time filter design /spl minus/ an overview
TL;DR: In this article, the state of the art of continuous-time filter design is reviewed and several techniques are discussed and compared in terms of performance and implementation feasibility in different fabrication technologies.
Journal ArticleDOI
Fully differential operational amplifiers with accurate output balancing
TL;DR: Design considerations are presented for attaining accurate output balancing in fully differential operational amplifiers over the useful operating frequency of the differential signals, and two circuit designs implemented in a 5-V, 1- mu m process are presented.
Proceedings ArticleDOI
Integrated continuous-time filter design
TL;DR: In this paper, the state of the art of continous-time filter design is reviewed and several techniques are discussed and compared in terms of performance and implementation feasibility in different fabrication technologies; the bulk of this review is devoted to device-level integrator-based filter design, although other techniques also mentioned.