Introduction

The proliferation of wireless products over past few years has been rapidly increasing. New wireless standards such as GPRS and HSCSD have brought new challenges to wireless transceiver design. One pivotal component of transceiver is frequency synthesizer.

Two major requirements in mobile applications are efficient utilization of frequency spectrum by narrowing the channel spacing and fast switching for high data rates. This can be achieved by using fractional- N PLL architecture. They are capable of synthesizing frequencies ....etc

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ABSTRACT
Wide band Sigma-Delta PLL modulator is based on PLL fractional N synthesis techniques along with Sigma-Delta modulation to randomize fractional N spurs. A modified Sigma-Delta function allows for suppression of Sigma-Delta noise at low frequencies & hence allows wider bandwidth. This is achieved using a fractional-N PLL architecture. They are capable of synthesizing frequencies at channel spacings less than the reference frequency. This helps to increase the reference frequency & hence reduces PL ....etc

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INTRODUCTION

The proliferation of wireless products over past few years has been rapidly increasing. New wireless standards such as GPRS and HSCSD have brought new challenges to wireless transceiver design. One pivotal component of transceiver is frequency synthesizer.

Two major requirements in mobile applications are efficient utilization of frequency spectrum by narrowing the channel spacing and fast switching for high data rates. This can be achieved by using fractional- N PLL architecture. They are capable of synthesizing frequencies ....etc

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PRESENTED BY
S.ELANGO
P.C. KISHORE KUMAR


A 130nm CMOS to Minimize area and quantization noise in frequency synthesizer using offset PLL
ABSTRACT
 It achieves low-noise .
 OPLL highly suppresses the quantization noise from the delta-sigma modulator.
 It consumes low power by employing charge-recycling
technique in the sub-PLL.
 Synthesizer implemented in 0.13 ȗm
 CMOS process achieves 9 dB of noise reduction compared to a conventional PLL while consuming 3.2 mW of po ....etc

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presented by:
Vajoorbi Mohammad


ABSTRACT:
In this we concentrate on sigma delta modulator to produce high resolution with less power consumption and without change in conversion speed. low pass filter is used to get the band pass signal
Driven by the digital circuit technology, the feature size of transistors has shrunk into the sub-100nm range earlier than estimated. The working voltage is decreased as a consequence of the size reduction in order to avoid transistor breakdown. However, the dec ....etc

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ABSTRACT

Wide band Sigma-Delta PLL modulator is based on PLL fractional N synthesis techniques along with Sigma-Delta modulation to randomize fractional N spurs. A modified Sigma-Delta function allows for suppression of Sigma-Delta noise at low frequencies & hence allows wider bandwidth. This is achieved using a fractional-N PLL architecture. They are capable of synthesizing frequencies at channel spacings less than the reference frequency. This helps to increase the reference frequency; hence reduces PLL’s locking time.
One of the ....etc

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Introduction
The sigma delta conversion technique has been in existencefor many years, but recent technological advances now makethe devices practical and their use is becoming widespread.The converters have found homes in such applications ascommunications systems, consumer and professional audio,industrial weight scales, and precision measurement devices.The key feature of these converters is that they are the onlylow cost conversion method which provides both highdynamic range and flexibility in converting low bandwidth inputsignals ....etc

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Wideband Sigma Delta PLL Modulator

The proliferation of wireless products over past few years has been rapidly increasing. New wireless standards such as GPRS and HSCSD have brought new challenges to wireless transceiver design. One pivotal component of transceiver is frequency synthesizer.

Two major requirements in mobile applications are efficient utilization of frequency spectrum by narrowing the channel spacing and fast switching for high data rates. This can be achieved by using fractional- ....etc

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plz provide me sigma comparator ppt...i want to learn how sigma comparator works ..if u are with animation plz provide that also ....etc

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Introduction

The proliferation of wireless products over past few years has been rapidly increasing. New wireless standards such as GPRS and HSCSD have brought new challenges to wireless transceiver design. One pivotal component of transceiver is frequency synthesizer.

Two major requirements in mobile applications are efficient utilization of frequency spectrum by narrowing the channel spacing and fast switching for high data rates. This can be achieved by using fractional- N PLL architecture. They are capable of synthesizing frequencies ....etc

[:=Read Full Message Here=:]