Minimal Input Power for Transceiver RF ICs
时间：04-09
整理：3721RD
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Hello,
for the RF-Test of modern Transceiver Chips (Bluetooth, GPS, WLAN, etc.) the minimal receive power is specified as -145dBm (for example).
Isnt it unrealistic to establish such low sinusoidal signals.
I am thinking about our test equipment, and I cant believe that -145dBm is still above the noise floor.
-145dBm = 3.16 E-15 mW = 3.16 E-18 W = 12.5 nVRMS for 50 Ohm sytem.
Thank you for any comments.
elektr0
for the RF-Test of modern Transceiver Chips (Bluetooth, GPS, WLAN, etc.) the minimal receive power is specified as -145dBm (for example).
Isnt it unrealistic to establish such low sinusoidal signals.
I am thinking about our test equipment, and I cant believe that -145dBm is still above the noise floor.
-145dBm = 3.16 E-15 mW = 3.16 E-18 W = 12.5 nVRMS for 50 Ohm sytem.
Thank you for any comments.
elektr0
Yes but this is a "Limit" for the signal.In addition to, there should be a S/N ratio to receive a certain quality signal depending on modulation scheme and bandwidth
Some very expensive SA's have such noise floor but there should be very tricky circuit topologies.
Yes, -145dBm is under the noise floor, but it's the fact.
We can only get the GPS signal lower than -119dBm.
But I think the signal of Bluetooth and WlAN will higher than -119dBm.