By Heimo Uhrmann
Starting from the fundamentals of analog filters and the terrible transistor features in nanometer CMOS 10 high-performance analog filters built by way of the authors in a hundred and twenty nm and sixty five nm CMOS are defined widely. between them are gm-C filters, current-mode filters, and lively filters for system-on-chip consciousness for Bluetooth, WCDMA, UWB, DVB-H, and LTE purposes. For the energetic filters a number of operational amplifier designs are defined. The booklet, moreover, features a assessment of the latest kingdom of analysis on low-voltage low-power analog filters. to hide the subject of the e-book comprehensively, linearization matters and dimension tools for the characterization of complicated analog filters are brought moreover. various complicated illustrations advertise a simple comprehension. This ebook should be of price to engineers and researchers in in addition to scientists and Ph.D scholars at universities. The ebook can also be recommendable to graduate scholars specializing on nanoelectronics, microelectronics or circuit engineering.
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Extra info for Analog Filters in Nanometer CMOS
9), the filter gain A can be tuned independently of the quality factor Q, and the resonance frequency ω0 and the quality factor can be tuned independently of the resonance frequency. An important aspect is now the influence of the nonideal parameters of the OTA to the filter transfer function. In general, a lot of parasitics and finite OTA bandwidth can affect the filter performance. Usually, the parasitic capacitances can be absorbed into the circuit capacitances. This absorption approach determines the real component values by subtracting the parasitic induced increments from the nominal values.
The clock feed-through leads to an interference with the filtered signal. Secondly, good switching properties of the transistors, which imply a low on-resistance and a high off-resistance, are necessary. A low on-resistance can be achieved by increasing the transistor width that also means an increase of the parasitic capacitance. In principle, for the realization of integrated CT filters 3 different topologies are possible: H. 1007/978-3-642-38013-6_5, © Springer-Verlag Berlin Heidelberg 2014 39 40 5 Gm -C Filters • Opamp RC-filter • Gm -C filter • Current-mode filter For the design of CT filters in the frequency range below 50 MHz mostly an active RC-filter based on an opamp is used.
Chapter 4 Operational Transconductance Amplifiers (OTAs) An ideal transconductance amplifier is a voltage-controlled current source, with an infinite input and output impedance. Beside in Gm -C filters, OTAs can be used in data converters, variable gain amplifiers and equalizers. In Fig. 1 the symbol of a single-ended and a fully-differential transconductor is shown. The factor between the output current and the input voltage is called transconductance. 1) One of the key attractive properties of OTAs is the fast speed in comparison to conventional operational amplifiers.