Qualcomm Moderated Thread - please read rules before posting Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : Qualcomm Moderated Thread - please read rules before posting

QCOM 159.42

-1.2%

Jan 16 3:59 PM EST

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: slacker711 who wrote (77348)	5/27/2008 2:56:42 PM
From: thinkclear	Read Replies (1) of 197272

The main issue with the power amp for the handset is the peak power to average power ratio of the waveform. If the peaks are clipped or compressed the bit error rate increases and the waveform will have out of channel sidebands which have to be filtered out so that they don't interfere with adjacent channels. If the average power and the peak to avg power of the DO waveform and the WCDMA waveform were the same then it would be conceivable to use the same amp. I don't believe this is the case. The bandwidth of the waveform, 1.25 MHz vs. 5MHz is minor due to the miniscule ratio of the waveform bandwidth to the transmit freq. My experience with this ended pre-WCDMA so I can't comment on the actuals measured in the lab. -tc

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next