NDLI: A feedforward technique with frequency-dependent current mirrors for a low-voltage wideband amplifier

Content Provider	IEEE Xplore Digital Library
Author	Itakura, T. Iida, T.
Copyright Year	1966
Abstract	A feedforward technique using frequency-dependent current mirrors for a low-voltage wideband amplifier is presented. In the conventional single-stage wideband amplifiers, the folded cascode structure is used. However, the common-gate transistor requires an additional V/sub DS sat/ and reduces the available output voltage range. In this study the cascode structure is avoided; instead, a frequency-dependent current mirror, whose input impedance becomes higher for a higher frequency, is used to form the feedforward path from the input of the current mirror with a feedforward capacitor. This technique is effective to improve a 100 MHz-1 GHz frequency characteristic of the amplifier. The amplifier has been fabricated using the standard 0.8 /spl mu/m CMOS process. The phase margin is improved from 46-66/spl deg/ without sacrificing the unity gain frequency of 133 MHz compared with the amplifier without this technique. The amplifier operates at 2.5 V power supply voltage and consumes 12 mW.
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	847
Ending Page	849
Page Count	3
File Size	338508
File Format	PDF
ISSN	00189200
Volume Number	31
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Mirrors Wideband Impedance Broadband amplifiers Capacitors Voltage Circuits Hafnium Capacitance
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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