Direct Conversion of 802.11a receiver

[dd2001]

Is it possiable to implemente of Direct conversion for 802.11a, running at 5GHz.

Any one knows this issue?

 

[buta]

It is possible but it may be a challenge. Two 802.11a chip set manufacturers use dual conversion and low IF.

 

[RC13]

802.11a,
it depands on
1.). what process/technology you use, if CMOS, you can actually forget about designing WLAN 802.11a,
2.). what price?
3.). fully integrated or multichip?

 

[saintdream]

why,"if CMOS, you can actually forget about designing WLAN 802.11a, "
there are lots of products available now!

 

[cooleyn]

Most of the wlan TRx products use direct-conversion
architecture today, such as Maxim's, Airoha's, broadcom's, TI's, Realtek's.., ZIF architecture is very suitable for broadband application shuch as WLAN.

 

[tigana123]

By searching the IEEE JSSC you will find several papers for 5GHz 802.11a direct conversion receivers as well as the issues that they are facing like DC offset etc.

Some examples:

"A 5-GHz direct-conversion CMOS transceiver utilizing automatic frequency control for the IEEE 802.11a wireless LAN standard," Solid-State Circuits, IEEE Journal of , vol.38, no.12, pp. 2209-2220, Dec. 2003

"A 72-mW CMOS 802.11a direct conversion front-end with 3.5-dB NF and 200-kHz 1/f noise corner," Solid-State Circuits, IEEE Journal of , vol.40, no.4, pp. 970-977, April 2005

"A single-chip digitally calibrated 5.15-5.825-GHz 0.18-/spl mu/m CMOS transceiver for 802.11a wireless LAN," Solid-State Circuits, IEEE Journal of , vol.38, no.12, pp. 2221-2231, Dec. 2003