By Tien-Yu Lo, Chung-Chih Hung (eds.)
1V CMOS Gm-C Filters: layout and Applications discusses the layout features of transconductor and Gm-C clear out circuits, with a distinct specialize in 1V circuit implementations. The emphasis is on excessive linearity voltage-to-current blocks for instant and wireline functions, and the designs disguise as much as very excessive pace specifications.
1V CMOS Gm-C Filters: layout and Applications starts off with a basic advent to the ideas of transconductors. The assessment of the overall architectures is equipped, starting from shunt suggestions to floating gate topologies. numerous transconductors in response to nano-scale applied sciences are mentioned with targeted attentions to the quick channel impact. The performances are optimized whereas taking pace, linearity and gear intake into account. The implementation of the Gm-C filter out is brought following the transconductors. The filter out synthesis and non-ideal results attributable to lively units are analyzed. 3 Gm-C filters are applied for channel choice in instant receivers, and all of those filters function less than a number of modes to save lots of chip region. the objective purposes are IEEE 802.11a/b/g instant LANs, Wideband CDMA, cdma2000, and Bluetooth. additionally, the excessive pace clear out required for pulse sign interface can also be mentioned. a number of excessive pace filters are carried out with systematic layout tactics. The layout and dialogue of computerized tuning structures are incorporated as well.
1V CMOS Gm-C Filters: layout and Applications presents a transparent creation of low voltage architectures and yields perception into the effect of circuit non-idealities. The totally CMOS implementation may be beneficial for instant and wireline functions. the elemental layout thoughts may be simply developed throughout the representation of this publication. This ebook will be supplied for engineers and researchers who're drawn to the transconductor and Gm-C filter out. it's also an outstanding reference for the path with regards to analog built-in circuit design.
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Additional info for 1V CMOS G m -C Filters: Design and Applications
1. We assume that the transconductor and the capacitor are ideal elements. -Y. -C. V. 1) 47 48 3 Gm -C Filter Fig. 1 The single-ended integrator Fig. 2 The fullydifferential integrator: (a) single capacitor (b) dual capacitors We can obtain that the unity-gain frequency ωo is Gm =CL . Thus, the output voltage is equal to the integration of the input voltage multiplied by the integrator unity-gain frequency. The ideal integrator has an infinite DC gain and a phase shift of 90ı . ω// 1 . ω/, indicates the integrator phase deviation from 90ı .
Besides, the current mirrors M9 to M12 would also contribute second-order distortion components under the proposed degenerated structure, and thus large device sizes and small aspect ratios could be designed. From the simulation with 2% transistor mismatch, the highest even-order components remain lower than odd-order components by at least 5 dB. In addition, careful layout was taken while the device match is required. The error output current contributed by transistor mismatch can be divided by the overall transconductance to model an equivalent offset voltage, and it could be removed by applying an offset voltage of input differential signals.
First, the fundamental of the integrator is discussed. Then, the methods of filter synthesis are introduced. The transconductors and capacitors are assumed ideal under filter synthesis. After discussing the synthesis methods, the non-idealities of the filter are presented. A second-order band-pass filter is used as an example to illustrate the effects of the transconductor non-idealities. It will show that transconductor properties determine the filter performance. 1 Integrator To realize an integrator in Gm -C technology, a transconductor and a capacitor can be used as shown in Fig.
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