4DSP Support Forum
Products => FMC Products => FMC30RF => Topic started by: kcfarleyswmacb on October 10, 2013, 06:00 PM
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1) Please elaborate what 14 bit 16 bit left aligned complex samples mean.
In Reference Design Details at the end there is a statement:
- The data format is 14-bit, 16-bit left aligned complex samples with I and Q samples interleaved.
2) I want to inject a signal into RF IN of FMC30RF from a agilent analog generator.
a) A sine wave offset from tx tune frequency.
b) What is acceptable input range of RF IN for dBM and voltages?
c) What is a good nominal value?
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Dear Sir,
1)
There are 14 bits of data which are left aligned on 16 bits word.
The data is placed on bits 13 down to 2, bits 1 and 0 being nothing. I Q interleaved means that the sequence in the buffer looks like the following
I0Q0I1Q1I2Q2I3Q3...
2)
I will get one of my colleague to provide you with this information, it is not part of the user manual indeed.
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Just to make sure I really understand 14 bit 16 bit left aligned:
Take 14 bit vector and concatenate two zeroes into bit 0 and bit 1 to make a 16 bit vector
VHDL
(14 bit vector) & '0' & '0'
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Dear Sir,
From the VHDL source code delivered with the BSP:
rx_data_i <= adc_i & "0000";
dac_a <= tx_data_i(15 downto 4);
Best Regards,
Arnaud
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Dear Sir,
1)
There are 14 bits of data which are left aligned on 16 bits word.
The data is placed on bits 13 down to 2, bits 1 and 0 being nothing. I Q interleaved means that the sequence in the buffer looks like the following
I0Q0I1Q1I2Q2I3Q3...
2)
I will get one of my colleague to provide you with this information, it is not part of the user manual indeed.
Dear Sir,
I am also eager to know [size=78%] a) What is acceptable input range of RF IN for dBM and voltages?[/size] b) What is a good nominal value? Can you invite your colleague to answer this. I would be very grateful.
Thanks.
Marchzh
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Hello Marchzh,
Please find attached the test results for input power (BB gain and 3dB att refers to TRF3711 settings). Best Regards,
Peter
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