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EVM Degradation at 54 Mbps OFDM (802.1g) - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

-- Amateur Radio
-- Antennas
-- Circuits & Components
-- Systems
-- Test & Measurement

 Post subject: EVM Degradation at 54 Mbps OFDM (802.1g)
Posted: Wed Jan 20, 2010 9:03 am 
 
Colonel
User avatar

Joined: Wed Aug 16, 2006 8:20 am
Posts: 31
Location: India
Hi
I designed a 802.11b/g Transceiver using Airoha's AL7230 Chip-set. When I do EVM measurements on the Transmitter antenna port using a Vector Signal Analyzer, the EVM passes for all modulation Schemes and at all output power level (17 dBm maximum) except 54 Mbps OFDM. When I reduce the output power level by approximately 5dB then the EVM test passes.

Is this problem due to the Crest Factor of 54 Mbps OFDM signals. The Chip-set data sheet satisfies the EVM requirements for a Power output of 17 dBm. I have only placed a Balun and a switch at the Chip-set Transmitter output pins. Can this degrade my PA linearity

_________________
Ashish Bondia,
Design Engineer- RF




Posted  11/12/2012

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