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 through 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 energetic filters for system-on-chip awareness for Bluetooth, WCDMA, UWB, DVB-H, and LTE purposes. For the lively filters numerous operational amplifier designs are defined. The ebook, additionally, incorporates a evaluate of the latest kingdom of study on low-voltage low-power analog filters. to hide the subject of the publication comprehensively, linearization concerns and size equipment for the characterization of complex analog filters are brought additionally. various tricky illustrations advertise a simple comprehension. This publication could be of price to engineers and researchers in in addition to scientists and Ph.D scholars at universities. The booklet 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 (Springer Series in Advanced Microelectronics)
This would cause for a filter with a cut-off frequency of 250 MHz a unity-gain frequency of 5 GHz. The implementation of opamps of such high unity-gain frequencies is a difficult task. 6 GHz. So for the realization of CT filters in the hundred-MHz frequency range the Gm -C topology is a better candidate to obtain filters with a high quality factor. In Gm -C filter design, the key component is the operational transconductance amplifier (OTA) which is a voltage dependent current source. An OTA usually works in an open-loop configuration which allows higher transit frequencies in comparison to opamps.
44 5 Gm -C Filters Fig. 18 µm CMOS is presented. 6 mW at a supply voltage of 1 V. 32 Vpp at 1 % THD. In  two 4th-order Bessel low-pass filters that cover various wireless standards are described. The filter is realized by two identical 2nd-order opamp filters as shown in Fig. 4. 5 MHz and 11 MHz, respectively. The DR is equal to 55 dB in WLAN environment and 58 dB in UMTS. The second filter is constructed for WLAN and Bluetooth tasks, where the bandwidth is switchable between 1 MHz and 11 MHz.
2 V. Again a smaller L improves the transconductance gm . 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.
Analog Filters in Nanometer CMOS (Springer Series in Advanced Microelectronics) by Heimo Uhrmann, Robert Kolm, Horst Zimmermann