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Technology Stocks : Qualcomm Moderated Thread - please read rules before posting -- Ignore unavailable to you. Want to Upgrade?

To: Clarksterh who wrote (3139)	9/15/2000 2:09:27 AM
From: engineer	Respond to of 197036

Clark, If you take the power amp and break down the power budget into it's parts, you will find that 35-40% of it is pure bias current to maintain the linearity. but if HDR has less lineraity requirements, the bias current decrease may just offset the higher power requiremetns for the per bit transmission power. As for the REST of the radio, there is NO change. As for the rest of the entire PC board there is NO change. the only thing that changes is a turbo viterbi decoder and the digital combining modulation scheme. The viterbi decoder takes very little power and the digital mod takes less than 100 micro watts. One of the assignments I worked on for a short time was to assist the HDR guys in taking a STOCK phone module and modifying it for use as an HDR modem. they took out the MSM chip, added some circuits in FPGAS to model the vit dec and modulation, and then plugged the emulator back into the module wiht only slight changes, such as the bias current limiter. The power control tables were modified slightly, but not enough to modify the standby and transmit power drain curves by any great measureable amount. I did not say taht the power drain would be the SAME in my post, I said it would be about the same as the present phones today. this means that you could get a sub 90 gm phone wiht 2 hours of talk time and HDR. but then I didn't run spreadsheets of power budgets to check it out, so you may have a point....