All-CMOS Solutions Make Splash in 802.11b Market

Despite their late entries into the chipset market for wireless local
area networking (WLAN), two chip companies were hoping to make a big splash
on Tuesday with the claims they have each independently developed the
industry’s first all-CMOS solution for chipsets based on the IEEE 802.11b
standard (a.k.a. Wi-Fi).

Marvell on Tuesday announced the 88W8200 — its
baseband processor — as well as the 88W8000, which the Sunnyvale,
Calif.-based company claimed to be the industry’s first true 802.11b
single-chip radio design. But not to be outdone, Broadcom Corp., the Irvine,
Calif.-based semiconductor giant, announced it has entered the WLAN chipset
market with its BCM2051 2.4GHz direct-conversion RF radio and the BCM430x
family of baseband processors. Both companies are claiming to have developed
all-CMOS techniques for fab production — which, in laymen’s terms, means a
digital process that substantially lower production costs.

While companies like Atheros Communications have already staked claims on all-CMOS
solutions for the 802.11a market, existing 802.11b chipmakers like Intersil,
Texas Instruments and Agere have generally relied on an analog fab
production method known as Silicon-Germanium (SiGe) (pronounced “Siggy”) to mass produce the radio (RF) portion of
their chipsets. (Another analog technique called Gallium Arsenide (GaAS) is
used to produce the power amplifier (PA) portion of the chipset but that’s
neither here nor there.)

“We see this as being an incredibly important milestone,” Gary Smerdon, Marvell’s vice
president of Marketing for the Communications Business Group, told InternetNews.com. “Implementing RF circuits in CMOS has been a focus of industry and
university research for the past decade.”

Still, that hasn’t stopped chipmakers like Intersil from arguing against
CMOS RF production. While it’s true that CMOS simplifies mass production by
creating “fab-portability” (meaning you can then take the manufacturing
process to any fab production plant around the world), the technique is
still difficult to perfect and does increase the risk of lower quality fab
output.

However most analysts still generally agree that CMOS represents the
zenith for silicon fab production. For example, the MAC/baseband portion of
a two-chip solution is mostly done in CMOS. And Intersil and other 802.11b
players hope to make their own CMOS announcements later in the future.

“There is a downside with CMOS but, once you perfect the process, you
should be able to get lower costs,” said Navin Sabharwal, vice president of
Residential & Networking Technologies at Allied Business Intelligence.

Yet while both companies generally agreed on the importance of CMOS fab production, each was quick to point out their respective superior characteristics. Broadcom explained that its BCM2051 is a direct-conversion CMOS IC, which essentially streamlines the chip by combining two functions into one.

Meanwhile, Marvell said its product is newsworthy because they have integrated the PA into the CMOS process to create a true single-chip CMOS solution.