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 filter out circuits, with a distinct specialise 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 velocity specifications.
1V CMOS Gm-C Filters: layout and Applications starts off with a normal advent to the strategies of transconductors. The evaluation of the overall architectures is supplied, starting from shunt suggestions to floating gate topologies. quite a few transconductors in response to nano-scale applied sciences are mentioned with particular attentions to the fast channel impression. The performances are optimized whereas taking velocity, linearity and tool 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 quarter. the objective functions are IEEE 802.11a/b/g instant LANs, Wideband CDMA, cdma2000, and Bluetooth. furthermore, the excessive velocity filter out required for pulse sign interface can also be mentioned. numerous excessive velocity filters are carried out with systematic layout techniques. The layout and dialogue of automated tuning structures are incorporated as well.
1V CMOS Gm-C Filters: layout and Applications offers a transparent advent of low voltage architectures and yields perception into the impact of circuit non-idealities. The absolutely CMOS implementation may be beneficial for instant and wireline purposes. the fundamental layout thoughts will be simply developed in the course of the representation of this ebook. This e-book could be supplied for engineers and researchers who're drawn to the transconductor and Gm-C filter out. it's also a great reference for the path regarding analog built-in circuit design.
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Extra resources for 1V CMOS G m -C Filters: Design and Applications
13. Thus, the small reduction in the transconductance value makes high linearity and high speed possible under about 30% of extra power consumption. Transconductance tuning is another important issue in the transconductor design. The main idea of the transconductance tuning is to compensate for the variation caused by the fabrication process and temperature. 14 shows the contour plot of the third-order harmonic component under transconductance tuning, resulting from Fig. 13. We can find that if Q is changed from 1 to 4 when P is set to 9, it implies more than 300% of the transconductance tuning range, as shown in Fig.
31) Therefore, the distortion components caused by transistor mismatch could be minimized by applying large degenerated resistors and gate overdrive voltage. 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.
Since transistor M4 needs to work in the weak inversion region in order to reduce the harmonic distortion, the source follower plays an important role in the approach. For large bias current, the gate-source voltage of the source follower will become larger. In this case, the minimum input swing range and the aspect ratio of transistor M4 should be increased in order for M4 to stay in the weak inversion region and for effective nonlinearity compensation. If a smaller source follower gain is maintained, the source follower would work as a voltage attenuator and the input swing range can be increased.