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V Supply Voltage (v + supply_voltage)

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Engineering100%

Selected Abstracts

Using MOS current dividers for linearization of programmable gain amplifiers

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 4 2008
M. Teresa Sanz
Abstract Two highly linear, digitally programmable gain amplifiers are presented and compared in terms of linearity, frequency, area and power consumption. High linearity and wide gain tuning range with moderate area consumption are the main benefits of both configurations. Furthermore, constant bandwidth is achieved by means of switched compensation capacitor arrays. Three-bit prototypes were integrated in a 0.35,µm,3.3,V CMOS process with 2.5,V supply voltage. Experimental distortion levels are better than ,68,dB for 1,MHz and 1,Vp,p output signals in both configurations; hence, the suitability of the linearization technique based on MOS current dividers is shown. Copyright © 2007 John Wiley & Sons, Ltd. [source]

Low power dual transformer injection locked frequency divider using 0.5 ,m GaAs E/D-mode PHEMTs process

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2010
Po-Yu Ke
Abstract This letter proposes a new divide-by-2 injection locked frequency divider (ILFD) fabricated by 0.5 ,m GaAs ED-Mode PHEMTs process and describes the operation principle of the dual-transformer ILFD. The first transformer is applied to replace two inductors of the cross-couple LC-tank oscillator circuit. The injection signal of the ILFD transmits into a transistor through a second transformer, which consisted of a bandpass filter achieving a high injection signal power and wide locking range. The measurement results show that the divider's free-running frequency were from 6.47 to 9.54 GHz (32.2%) with 3 V supply voltage. With an incident power of 0 dBm, the locking range is 3.07 GHz from the incident frequency 16.41 to 19.45 GHz (15.6%). The measured phase noise of free running VCO is ,92.2 dBc/Hz at 1 MHz offset frequency at 9.45 GHz and this value of the locked ILFD is ,128.4 dBc/Hz, which is 36.2 dB lower than the free running VCO. The core power consumption was 42 mW. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2302,2306, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25442 [source]

A novel tunable dual-band low noise amplifier for 868/915 MHz and 2.4 GHz Zigbee application by CMOS technology

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010
Kai Xuan
Abstract A dual-band (868/915 MHz and 2.4 GHz) low noise amplifier for Zigbee applications is designed using 0.35-,m CMOS technology. At 868/915 MHz and 2.4 GHz, the gains achieved are both 16 dB and the resulting noise figures are about 2.5 dB and 2.7 dB, respectively. The input and the output reflections are below ,10 dB in both bands. The amplifier works at 2.5 V supply voltage with 12 mA current dissipation. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 507,510, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24964 [source]

A digitally controlled band-switching VCO using switching inductors and capacitors in 0.18 ,m CMOS

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2008
Tienyu Chang
Abstract In this article, a digitally controlled band-switching voltage controlled oscillator (VCO) is designed and fabricated using TSMC 0.18 ,m CMOS technology. Design considerations regarding the power requirement and the phase noise of the VCO are discussed. Eight bands are set by three bits, with one bit controlling switching inductors, and two bits controlling switching capacitors. The VCO covers 2.9,3.45 GHz and 3.6,4.3 GHz using varactors for continuous frequency tuning. Phase noise of the VCO stays constant around ,110 dBc/Hz at 1 MHz offset for all bands. The fabricated VCO consumes 11 mA of current with 1.8 V supply voltage and has a small size of 730 ,m × 660 ,m. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 1970,1973, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23496 [source]