免看一级a毛片一片成人不卡,91人人碰在线

您好，
買賣IC網(wǎng)歡迎您。
請(qǐng)登錄
免費(fèi)注冊(cè)

您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383099 > IEEE 802.11 (Intersil Corporation) () PDF資料下載

參數(shù)資料

型號(hào)：	IEEE 802.11
廠商：	Intersil Corporation
英文描述：	()
中文描述：	（）
文件頁(yè)數(shù)：	7/7頁(yè)
文件大?。?/td>	69K
代理商：	IEEE 802.11

第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)當(dāng)前第7頁(yè)

2-7

All Intersil semiconductor products are manufactured, assembled and tested under

ISO9000

quality systems certification.

Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-

out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see web site

www.intersil.com

Typically it is desirable for the last element in the transmit

chain to set the P1dB of the system. The Cascaded 1dB

Compression Point is calculated as shown in Equation (10)

for Input P1dB or Equation (11) for Output P1dB.

Comparing the system P1dB at the Power Amplifier,

21.2dBm, with the P1dB of the PA itself, 24.5dBm, it is

apparent that other elements in the transmit chain are

affecting P1dB and therefore, contributing to the regrowth of

side-lobes early. Measurements have determined that a 6dB

margin, between signal power and the P1dB of a device will

result in 1dB of side-lobe regrowth. In the level diagram the

upconvert mixer has only 4.8dB headroom setting the P1dB

of the system from the mixer to the PA. If the upconvert mixer

were to have 2dB higher P1dB or if the transmit chain had

2dB additional gain, virtually all the side lobe regrowth could

be made to occur at the PA. This would allow the PA to be

driven for a larger output power signal, closer to the P1dB.

Conclusion

Through a detailed analysis of an existing radio design, this

paper has presented useful tools and methods for the design

and implementation of a 2.4GHz DS Wireless LAN radio.

These tools include; “Receive Chain Gain

Distribution/Limiter Analysis”, the “Receive Chain Front End

Cascade Analysis”, and the “Transmit Chain Front End

Cascade Analysis”.

The paper shows how the radio design is shaped from early

decisions about the modulation scheme, protocol, and

environment. The basic decision of what will provide the

majority of receiver gain, AGCs or Limiters. The use of a

typical block diagram, such as the Intersil PRISM chip set, in

the piecing together or setting goals for a new design or

understanding an existing one. Finally the cascade analysis

reveals strong and weak points in the design that may be

improved to reduce cost or gain performance.

The cascade analysis was performed using “AppCAD

Version 1.02 by HewlettPackard”. This freeware is no longer

available but many cascade analysis tools exist with

advanced capabilities and that are easy to use.

References

For Intersil documents available on the internet, see web site

www.intersil.com/

Intersil AnswerFAX (321) 724-7800.

[1] M. F. Uman,

“Introduction to the Physics of Electronics”

Prentice Hall Inc., Englewood Cliffs, N.J., 1974, pp. 82-

83.

[2] F. G. Stremler,

“Introduction to Communication

Systems”

, Addison-Wesley Publishing Company,

Reading, Mass, 1982, pp.185-189.

[3] AN9624, 1966 Application Note, Intersil Corporation,

“PRISM, DSSS PC Wireless Lan Description”

AnswerFAX Doc. No. 99624, C. Andren, M. Paljug, D.

Schultz

[4]

PRISM1BRD Data Sheet

, Intersil Corporation

AnswerFAX Doc. No. 4289

[5]

HFA3824 Data Sheet