[USRP-users] Transfer function Basic TX board ?
perz at kth.se
Fri Sep 28 17:21:38 EDT 2012
Regading the issue posted below. If anyone is interested :
I found out that my problem was the spectrum analyzer setting With appropriate setting of the spec the basic daughterboard, with removed transformer, goes down to at least 10kHz. The basic daughter-board with transformer also seems to work well down to 100kHz (i.e. small loss compared to higher frequencies).
From: usrp-users-bounces at lists.ettus.com [usrp-users-bounces at lists.ettus.com] on behalf of Per Zetterberg [perz at kth.se]
Sent: Wednesday, September 19, 2012 3:42 PM
To: usrp-users at lists.ettus.com
Subject: [USRP-users] Transfer function Basic TX board ?
We are looking at the Basic TX with USRP N210. When we generate a sinusoid the amplitude is -22.72dBm at 250kHz, -12.78dBm at 1MHZ and -8.63dBm@ 10MHz (the amplitude was 16000 in digital base-band ( unsigned short), UHD driver and a small program). This is perfectly fine with regards to the specification of the Basic TX board.
We then removed the components on the board and measured directly on the DAC output. The characteristic was still the same. We had suspected the transformer created the high-pass characteristic.
Could somebody please explain why we get this result? Is there some high-pass filtering going on on the FPGA?
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