By Heimo Uhrmann, Robert Kolm, Horst Zimmermann
Ranging from the fundamentals of analog filters and the negative transistor features in nanometer CMOS 10 high-performance analog filters built by means of the authors in a hundred and twenty nm and sixty five nm CMOS are defined commonly. between them are gm-C filters, current-mode filters, and lively filters for system-on-chip recognition for Bluetooth, WCDMA, UWB, DVB-H, and LTE functions. For the energetic filters numerous operational amplifier designs are defined. The e-book, moreover, features a evaluation of the most recent country of study on low-voltage low-power analog filters. to hide the subject of the e-book comprehensively, linearization matters and size equipment for the characterization of complicated analog filters are brought additionally. a number of complicated illustrations advertise a simple comprehension. This booklet might be of worth to engineers and researchers in in addition to scientists and Ph.D scholars at universities. The booklet can be recommendable to graduate scholars specializing on nanoelectronics, microelectronics or circuit engineering.
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Extra resources for Analog Filters in Nanometer CMOS (Springer Series in Advanced Microelectronics)
This has the consequence that the input transistors are PMOS transistors which have a better noise performance than NMOS transistors. In Fig. 24 the architecture of the Gm -C filter is shown. For the transconductors Gm0 , Gm1 , Gm2 the same Gm -cells are used and it should be noticed that for Gm0 , Gm1 only one CMFB together was used. For common-mode signals the closed loop consisting of Gm1 and Gm2 gives a positive feedback. So the closed-loop common-mode gain must be smaller than 1.
4 V). 24 3 CMOS Technology Fig. 12 PMOS output characteristics at varied gate length L Fig. 13 PMOS output conductance gDS at varied gate length L Fig. 14 PMOS transconductance gm at varied gate length L The transconductance gm of an NMOS transistor with the gate width of 5 µm is shown in Fig. 11. 2 V. gm is decreasing with larger lengths L as well as gDS . 12 depicts the output characteristics of a PMOS transistor with various gate lengths and 5 µm gate width. The gate-source voltage is fixed at −600 mV.
In principle this stabilization can be done in the discrete time domain or in the continuous-time domain. The main advantage of a sampled CMFB is that the power consumption is quite low. But it should be noticed that it produces also a lot of disturbances like clock feedthrough. So this book focuses only on continuous-time CMFBs. Usually a continuous-time CMFB consists of a differential amplifier which compares in a negative feedback loop the mean value of the output voltages with a reference voltage (see Fig.