HARTING

<p>There was a Chuck Yeager-like coolness to his utter command, control, and confidence in every onboard feature—from pulling up GPS location data on the iPAQ, to web browsing for flight information, and email checking—all the while handling incoming voice messages and data input through the iPAQ’s stylus based touch screen.</p>

Today’s electronics industry is highly aware of the value of intellectual property (IP), and in particular the threat of reverse engineering and piracy to designs. Security is therefore an inherent part of the design. Security features can be used not only to protect algorithms and design architectures, but also any sensitive data held within the design when in use.

The phone is specified to deliver four hours of TV watch time using a 1,500-milliwatt lithium-polymer battery. However, Nokia gave scant details about the internals of the 600-euro phone, which will not ship until about next June.

A Nokia spokesman would not comment on how broadly or quickly the company will roll out mobile-TV capabilities across its product line.

ESR01MZPF51R0_Datasheet PDF

Having this kind of complexity in a very small footprint creates an electrical environment that is very challenging,” said Juha Lipiainen, a director for multimedia strategy and business development at Nokia. The issue is how to economically encapsulate the mobile-TV capability in hardware.”

Indeed, mobile TV drives new hardware requirements throughout the handset, starting with tuner/demodulator chips — an arena where seven or more suppliers have already emerged.

Siano appears to have an early edge, because it offers a slightly lower power consumption and broader spectrum support than the rest of the pack. The SMS1000 two-chip set consumes 25 mW average and 225 mW peak, and is sampling now. Production is planned by June.

ESR01MZPF51R0_Datasheet PDF

The Siano chip set supports four mobile-TV spectrum bands. It handles the standard 450- to 860-MHz and 1,660- to 1,690-MHz bands for DVB-H in Europe and the United States, respectively. It can also tune in the 170- to 250-MHz bands for the Terrestrial Digital Mobile Broadcasting standard that will be used in Korea and parts of Europe, as well as the 1,450- to 1,490-MHz band the DVB-H group may endorse in January as a way to open up much-needed mobile-TV spectrum in Europe.

Siano gets its edge from using zero-IF conversion from RF analog to baseband, saving die area and power, and opening room for broader spectrum coverage. The startup claims it has proprietary techniques for handling the side effect of the zero-IF technique: greater baseband noise.

ESR01MZPF51R0_Datasheet PDF

Using a two-chip approach is the best route to power savings, said Ironi. The requirements of the RF in the tuner and digital in the demodulator are quite different. If you enforce the requirements of one over the other, you don't get optimized power consumption,” he said. Siano would not reveal its die size or process technology, but did say its parts will cost less than $10 when volumes hit in 2007. At least one other vendor also uses a zero-IF approach: startup Athena Semiconductors Inc., acquired for $21.6 million by Broadcom Corp. in October.

The Hollywood DVB-H single-chip tuner/demodulator from Texas Instruments Inc., meanwhile, consumes 30 mW average and 300 mW peak in a die measuring less than 1 cm2. However, those specs are based on estimates of a part that has yet to sample. The chip is not expected to ship until later next year, aiming at handsets shipping in 2007.

As an example, if we consider typical values used in a cellular phone with RL = 8Ω and VP = 3.6V (typical lithium-ion battery voltage), the dissipated power and efficiency curves versus output power are shown in Figures 4 and 5.

With a best case efficiency of less than 70% on the output power range, the battery life can be severely limited if the product is used for music playback or gaming where the audio is playing for extended periods. In addition, the junction temperature also increases significantly under the same conditions. This curve is based on a thermal resistance from junction to air at 110 deg. C/W, which is a typical value for a 9-pin Flip Chip package

With multimedia applications using two 8 Ω loudspeakers, the average output power is 100 to 200mW though the junction temperature is 35 deg. C higher than ambient.

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These application-oriented solutions offer solid performance improvements on an application-by-application basis, but each application requires a different solution, thus limiting their usefulness. And because accelerated application flows are mixed in with other WAN traffic, it is impossible to guarantee that the accelerated application will consistently perform as required. If one thought of the network as a highway, and applications as individual vehicles, Layer 7 solutions merely speed up the vehicles one-by-one. Layer 7 solutions have no view into the overall traffic on the network, and therefore cannot tailor the speed of the applications to coincide.

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