Space-division multiple access (SDMA) and orthogonal frequency-division multiplexing (OFDM) can be combined to design a robust communications system with increased spectral efficiency and system capacity. This combination is one of the most promising candidates for future wireless local area network implementations. However, one drawback of OFDM systems is the high peak-to-average power ratio, ...

Now-a-days leakage power is an important issue in microprocessor’s and hardware’s. In modern computer systems memory components covers 70 to 80 percent of total area of microprocessors that means memory contains more number of transistors. Generally leakage power dissipation proportional to the number of transistors. So the leakage power dissipation is more in the memories. In high performance ...

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MESSENGER's high-data-rate downlink will use the first electronically scanned phased-array antenna for a deepspace telecommunication application. Measured results for the lightweight phased-array antenna and the highefficiency Solid State Power Amplifiers (SSPAs), developed by JHU/APL, are presented. Two functional amplifiers within the X-band SSPAs provide output power that is scalable from 11...

Quasi-optical power combining techniques have been developed to address fundamental limitations in solid-state devices and circuits. These techniques have been applied to oscillators, amplifiers, frequencyconversion components, and control circuits. This paper surveys progress in the development of quasi-optical array systems operating in the microwave and millimeterwave regime, focusing primar...

This paper presents a broadband frequency quadrupler (FQ) implemented with standard 130-nm SiGe BiCMOS process. Two push-push doublers (×2) operate at an input of 32.5–55 GHz and 65–110 GHz, respectively. To properly drive the two enough power bandwidth, transformer coupled amplifiers (PAs) have been adopted. The former amplifier is based on neutralized capacitor structure latter topology. A no...

Ultra low-voltage (ULV) floating-gate (FG) differential amplifiers are presented. In this paper we present several different approaches to CMOS ULV amplifier design. Sinh-shaped and tanh-shaped transconductance amplifiers are described. Measured results are provided. Keywords— Floating-gate, low-voltage, low-power, lowvoltage amplifiers, analog floating-gate circuits.

A power amplifier (PA) is a key part of the RF front-end in transmitters for a local broadband network. Today, commercial PAs are made of III-V HEMT and HBT technology with excellent results. An integrated system-on-chip power amplifier circuit using CMOS technology for cost-effective and spectrum-efficient high-speed wireless communication presents major challenges because power amplifiers hav...