Receiver Measurements.pdf

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Prof. Dr. Ulrich L. Rohde
Chairman
Synergy Microwave Corp.
HB9AWE / NIUR
Ulr@synergymwave.com
Receiver Measurements,
How To Evaluate Receivers
Published in QEX Magazine July/August 2005
®
MICROWAVE CORPORATION
USKA Meeting
Davos, Switzerland
September 17, 2005
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Receiver Testing:
• Single-generator measurement: 1 RF signal at the receiver input
• Two-generator measurement: 2 RF signals at the receiver input
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MICROWAVE CORPORATION
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Data For A Good Receiver I
Immunity to interference, non-linearities
Intermodulation (1.5 to 30 MHz;
∆f >30
kHz; interfering signal 0 dBm)
IP
2
IP
3
Crossmodulation (0.1 to 30 MHz,
Interfering signal 5 V EMF (+21 dBm);
∆f >30
kHz; m = 0.3; f = 1 kHz;
signal level 10 mV EMF (-33 dBm))
Blocking (0.1 to 30 MHz;
Interfering signal 6.3 V EMF
(+23 dBm);
∆f >30
kHz:
signal level 1 mV EMF (-53 dBm);
m = 0.3; f = 1 kHz)
>60
dBm (typ. 70 dBm)
>30
dBm (typ. 35 dBm)
<10%
modulation transfer
>
1 signal dB attenuation
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MICROWAVE CORPORATION
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Data For A Good Receiver II
Desensitization
(interfering signal 300 mV EMF;
∆f >30
kHz; signal level
30
µV
EMF; bandwidth 3.1 kHz)
Inherent spurious signals
(f
>
100 kHz)
Image frequency rejection
If rejection
Weighted S/N ratio
For 1 mV EMF
>46
dB SINAD
<
-113 dBm (nominal – 124 dBm)
>90
dB
>90
dB
>
20 dB SINAD
®
MICROWAVE CORPORATION
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Block diagram of the setup to measure receiver sensitivity and S/N.
Single Tone Measurements
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MICROWAVE CORPORATION

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