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FMC30RF BOARD AND REFERENCE DESIGN QUESTIONS


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?

This topic is being closed because the issue is considered as resolved by 4DSP. Feel free to create a new topic for any further inquiries.
Hello Marchzh,


Please find attached the test results for input power (BB gain and 3dB att refers to TRF3711 settings). Best Regards,


Peter
[quote author=arnaudNL link=topic=2357.msg12130#msg12130 date=1381476258]

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.
[/quote]




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
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
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'
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.