Journal ArticleDOI
A pseudo differential complex filter for Bluetooth with frequency tuning
TLDR
A 12th-order OTA-C complex filter with a nonconventional frequency tuning for a Bluetooth receiver is implemented in a low-cost mainstream 0.35-/spl mu/m CMOS process and a high-speed pseudo differential OTA using common- mode feedforward (CMFF) and common-mode feedback (CMFB) strategy is proposed.Abstract:
A 12th-order OTA-C complex filter with a nonconventional frequency tuning for a Bluetooth receiver is implemented in a low-cost mainstream 0.35-/spl mu/m CMOS process. This proposed frequency tuning scheme is simpler than the conventional one based on phased-locked loop (PLL). Furthermore, a high-speed pseudo differential OTA using common-mode feedforward (CMFF) and common-mode feedback (CMFB) strategy is proposed. The filter bandwidth is 1 MHz and is centered at 2 MHz. Image and adjacent channels are attenuated by more than 45 and 27 dB, respectively. The integrated input referred noise is 29 /spl mu/V/sub rms/, and the filter chip dissipates 4.7 mA from a 2.7 V supply. The theoretical and experimental results are in good agreement.read more
Citations
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Journal ArticleDOI
A Low-Power Wideband Reconfigurable Integrated Active-RC Filter With 73 dB SFDR
TL;DR: A low-power, highly linear, integrated, active-RC filter exhibiting a reconfigurable transfer function (Chebyshev, Elliptic) and bandwidth and a digital automatic tuning scheme to account for process and temperature variations is presented.
Journal ArticleDOI
A 0.6-V Zero-IF/Low-IF Receiver With Integrated Fractional-N Synthesizer for 2.4-GHz ISM-Band Applications
TL;DR: This paper presents the design of an ultra-low voltage, low power and highly integrated dual-mode receiver for 2.4-GHz ISM-band applications, and discusses the design challenges at low voltage supplies such as limited fT for transistors and higher nonlinearities due to limited available signal swing.
Journal ArticleDOI
An RC time constant auto-tuning structure for high linearity continuous-time /spl Sigma//spl Delta/ modulators and active filters
TL;DR: An automatic RC time constant tuning scheme is proposed for high linearity continuous-time g/sub m/-C and active RC circuits in a low power consumption environment and achieves a peak S/(N+D) of 83 dB while a tuning range of over /spl plusmn/40% is accomplished.
Journal ArticleDOI
CMOS RF receiver system design: a systematic approach
TL;DR: A unified system-level design methodology for highly integrated CMOS radio frequency receiver design is introduced to minimize the total power consumption of the receiver.
Journal ArticleDOI
A 30-MHz Fifth-Order Elliptic Low-Pass CMOS Filter With 65-dB Spurious-Free Dynamic Range
TL;DR: A fifth-order 30-MHz integrated low-pass filter with 65-dB spurious-free dynamic range and high linearity and low noise are achieved by using polysilicon resistors and efficient highly linear transconductors based on a proposed nonlinear source degeneration technique.
References
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Journal ArticleDOI
CMOS mixers and polyphase filters for large image rejection
TL;DR: In this article, a powerful phasor-based analysis is used to explain all common image-reject topologies and their limitations, and it is shown how this can replace complex trigonometric equations commonly found in the literature.
Proceedings ArticleDOI
An analog integrated polyphase filter for a high performance low-IF receiver
Jan Crols,Michiel Steyaert +1 more
TL;DR: In this article, a 1.2 /spl mu/m CMOS process of a 5th order Butterworth polyphase filter with a bandwidth of 220 kHz centered around 250 kHz is reported.
Proceedings ArticleDOI
A Bluetooth radio in 0.18 μm CMOS
P.T.M. van Zeijl,Johannes Wilhelmus Theodorus Eikenbroek,P.-P. Vervoort,S. Setty,J. Tangenberg,G. Shipton,E. Kooistra,I. Keekstra,Didier Belot +8 more
TL;DR: By using an inductor-less LNA and the extensive use of mismatch simulations, the smallest silicon area for a Bluetooth radio implementation so far can be reached: 5.5 mm.
Journal ArticleDOI
Linear CMOS transconductance element for VHF filters
Bram Nauta,Evert Seevinck +1 more
TL;DR: In this article, a differential transconductance element based on CMOS inverters is presented, which is a linear, tunable integrator for very high-frequency continuous-time integrated filters.