TestData Summary of 5.2GHz WLAN Direct Conversion RF …inst.eecs.berkeley.edu/~n225c/sp08/Board.pdf · TestData Summary of 5.2GHz WLAN Direct Conversion RF Transceiver Board =====

National Semiconductor Corporation Advanced Wireless Technology Group

RF Test Report 5-December-2002

Stefan Haenggi [email protected]

Page 1 of 16

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TestData Summary of 5.2GHz WLAN Direct Conversion RF Transceiver Board

=========================================================================================

Serial Number : 0001 Date : 3-FEB-03 Tester : Stefan Haenggi

No Receiver Test Measured Target Units

1 Inband Input IP3 -12 >-10 dBm

2 Baseband S/N at 5.24GHz (ADC goes Vpp) -82dBm -65dBm -30dBm

9.6 23.8 24.8

>+7 >+23 >+23

dB dB dB

3 Passband Peak Peak Ripple at 5.24GHz (300kHz – 8MHz)

0.8

<1

dBpp

4 Overall Rejection at Carrier of first Adjacent Channel (+/-20MHz) second Adjacent Channel (+/-40MHz)

31.4 50.8

>25 >45

dBc dBc

5 Baseband Image Rejection at 5.24GHz 1MHz 4MHz 8MHz

-28 -27 -26

>-23 >-23 >-23

dBc dBc dBc

6 Static DC Offset after Mixer 20 <100 mV

7

No Transmitter Test Measured Target Units

1 RF Output Power at 5.24GHz to meet Mask Maximal AGC Minimal AGC

+10 -20

>+16 -20

dBm dBm

2 Output IP3 +26 >+28 dBm

3 Passband Peak Peak Ripple (300kHz – 8MHz)

0.3

<0.5

dBpp

4 Baseband Image Rejection at 5.24GHz 1MHz 4MHz 8MHz

-25 -25 -25

<-30 <-30 <-30

dBc dBc dBc

5 Carrier Leakage at 5.24GHz -35 <-15 dBc

No RF Local Oscillator Test Measured Target Units

1 Tuning Range (5.18GHz- 5.32GHz) OK

2 Integrated RMS PhaseJitter (10kHz to 10MHz) 5.18GHz 5.24GHz 5.32GHz

2.2 2.3 2.2

< 3.0 < 3.0 < 3.0

deg deg deg

3




Page 2 of 16

TestSetup

DUT Direct Conversion Radio

RX Test

RX_QAD

DA TX_I

DA TX_Q

Power Attenuator

Synth

RX_IAD

MATLAB

2 x 14bits / 40MS/s

DIGITAL PATTERN

GENERATOR

10MHz Ref in

2 x 14bits / 40MS/s

DIGITAL LOGIC

ANALYZER G

P

I

BState Mode

2 x 14bits / 40MS/s

DIGITAL SAMPLING

SCOPE G

P

I

B2 Channel

Diff.

Probe

Diff.

Probe

G

P

I

B

U

S

BMATLAB V13

LAPTOP

Instrument Control Toolbox

U

S

B

CW, QPSK

5GHz, -90 to -30dBm

RF GENERATOR A

CW, QPSK

5GHz, -90 to -30dBm

RF GENERATOR B

10MHz Ref out

PhaseNoise option

10kHz to 6GHz

SPECTRUM ANALYZER

High Peak Power Head

10kHz to 6GHz

RF POWER METER

TX Test

Vari-L GUI

Windows

PCP

a

r

a

Analog PowerSupply

Digital PowerSupply

10MHz Ref in Binary converter

1tone, 2tone, OFDM




Page 3 of 16

1-1) Receiver, IQ Baseband Analog Frequency Response

1-2)

1. Adjacent

Channel 20MHz -31.4dB

2. Adjacent

Channel 40MHz -50.8dB

Signal after Baseband LNA

Signal before AD Converter

Passband Ripple 0.4dBp




Page 4 of 16

1-3) Receiver, IQ Digital Baseband, Sampling Rate 40Ms/s, 4096 samples, Input Signal 5.244GHz, -82dBm, CW

1-4) 1-5)

Channel Filter shaping

Image

DC Offset

Input signal




Page 5 of 16

1-6) Receiver, IQ Digital Baseband, Sampling Rate 40Ms/s, 4096 samples, Input Signal 5.244GHz, -65dBm, CW

1-7) 1-8)




Page 6 of 16

7) Receiver, IQ Digital Baseband, Sampling Rate 40Ms/s, 4096 samples, Input Signal 5.244GHz, -30dBm, CW

1-9) 1-10)




Page 7 of 16

AD Discrete Step Performance 1-11)

No missing codes, more or less equal binwidth




Page 8 of 16

1-12) Receiver, IQ Digital Baseband, Sampling Rate 40Ms/s, 4096 samples, Input Signal 5.240 + offset GHz, -65dBm, CW

Frequency Offset = 1MHz Image Rejection = -28dBc






Page 9 of 16

1-13) Receiver, IQ Digital Baseband, Sampling Rate 40Ms/s, 4096 samples, Input Signal 5.243GHz + 5.244, -30dBm, CW

2 tone input

IP3 product

Image




Page 10 of 16

1-14) Transmitter, I signal Analog Baseband after DAC, WLAN BPSK 800bit packet, Frequency domain, before filtering

Comments : The baseband spectral shape should be able to pass the WLAN standard. The analog filter should have about 30dB rejection at 30MHz. With DAC who have internal interpolation (up-sampling) the filter specification could be relaxed significantly.

OFDM Waveform

DAC sampling rate : 40Ms/s

First unwanted

Image.

OFDM convoluted

with sampling

Impulse train (sin(x)/x)

Multiple

unwanted OFDM images

Wanted OFDM Waveform




Page 11 of 16

Transmitter, RF signal with WLAN OFDM BPSK 800bit packet

TX RF signal before going into PowerAmplifier

TX RF signal after PowerAmplifer at the antenna connector

RF PowerRMS = +10dBm Spectral mask would pass

TX RF signal after PowerAmplifer at the antenna connector

RF PowerRMS = +16dBm Spectral mask would probably not pass

Spectrum Mask from 802.11a Physical Layer Standard




Page 12 of 16

1-15) Transmitter, RF signal with 2tone test for Linearity

TX RF Power RMS : +15dBm at atenna port IP3 products : -22dBc Resulting output IP3 : +26dBm Carrier Leakage : -35dBc Image rejection : -25dBc

Wanted 2tone

Carrier Leakage

IP3 products

Image




Page 13 of 16

Transmitter, IQ signal Analog Baseband after Filter, WLAN BPSK 800bit packet, sampled with Scope, 1000 samples

Comments :




Page 14 of 16

1-16) LO/2 signal, Frequency Domain, 10MHz HP RF Generator reference, 2.62GHz

Span 50MHz Span 1MHz

Integrated RMS Phasenoise at 5.24GHz:

Frequency offset (Hz) 10k 20k 50k 100k 10M

Phasenoise (dBm/Hz) -72.2 -82.9- -93.7 -99.2 -104

RMS Phasejitter (10kHz-10MHz) = 2.2degree




Page 15 of 16

Impulse response over a full RX-TX chain TBD




Page 16 of 16

Measured static values

No Static values Measured Target Units

1 Receiver ON current consumption +8V PowerSupply -8V PowerSupply 5V PowerSupply 3V PowerSupply

……………. ……………. ……………. …………….

mA mA mA mA

2 Transmitter ON current consumption +8V PowerSupply -8V PowerSupply 5V PowerSupply 3V PowerSupply

……………. ……………. ……………. …………….

mA mA mA mA

3 LO/2 RF Power after Splitter after TX booster after RX booster

……………. ……………. …………….

7

Documents

TestData Summary of 5.2GHz WLAN Direct Conversion RF …inst.eecs.berkeley.edu/~n225c/sp08/Board.pdf · TestData Summary of 5.2GHz WLAN Direct Conversion RF Transceiver Board =====