AD-FMCOMMS1-EBZ Specifications

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Transmit Specs

There are many specifications on the Transmit side of a RF system

Evaluating High Speed DAC Performance

Theoretical specs

Bandwidth

Determining overall channel bandwidth is a little complex, since many devices don’t have a meaningful (in this aspect) bandwidth number.

In the AD9122, the above figure shows an fDATA of 400MHz, creating a waveform over 350MHz.
The ADL5375 does include a baseband bandwidth specification - depending on the flatness you require, could be 200MHz (+/- 0.1dB) or 500MHz (+/- 0.5dB).
the ADL5602 has different gain, depending on the RF frequency (but over 250MHz, you will still notice).

So, transmit bandwidth can be as high as 250 MHz, depending on if the flatness of the ADL5602 and ADL5375 works for your application.

LO BW (Modified Board)

LO BW with full output power |

Adjacent Channel Power (Modified Board)

ACP


ACP with LO of 1.2GHZ and Tone of 40MHz with full power out.	ACP with LO of 1.2GHZ and Tone of 40MHz with half power out.


ACP with LO of 2.4GHZ and Tone of 40MHz with full power out.	ACP with LO of 2.4GHZ and Tone of 40MHz with half power out.


ACP with LO of 3.6GHZ and Tone of 40MHz with full power out.	ACP with LO of 3.6GHZ and Tone of 40MHz with half power out.

Phase Noise (RevB unmodified Board)

Phase noise


Phase Noise at LO of 400MHz and Tone of 40MHz with full power out.	Phase Noise at LO of 900MHz and Tone of 40MHz with full power out.


Phase Noise at LO of 1.8GHz and Tone of 40MHz with full power out.	Phase Noise at LO of 2.4GHz and Tone of 40MHz with full power out.

Phase Noise at LO of 3.5GHz and Tone of 40MHz with full power out. |

Phase Noise (RevB Modified Board & RevC)


Phase Noise at LO of 1.2GHz and Tone of 40MHz with full power out.	Phase Noise at LO of 1.2GHz and Tone of 40MHz with half power out.


Phase Noise at LO of 2.4GHz and Tone of 40MHz with full power out.	Phase Noise at LO of 2.4GHz and Tone of 40MHz with half power out.


Phase Noise at LO of 3.6GHz and Tone of 40MHz with full power out.	Phase Noise at LO of 3.6GHz and Tone of 40MHz with half power out.

Output power (Modified Board)

Transmitter power output

CP with LO of 1.2GHZ and Tone of 40MHz with full power out. |

CP with LO of 2.4GHZ and Tone of 40MHz with full power out. |

CP with LO of 3.6GHZ and Tone of 40MHz with full power out. |

Intermodulation Distortion (Old Board)

Intermodulation_Distortion or IMD


Intermodulation Distortion showing 3rd and 5th order products at 450MHz for 3 power levels	Intermodulation Distortion showing 3rd and 5th order products at 950MHz for 3 power levels


Intermodulation Distortion showing 3rd and 5th order products at 1.85GHz for 3 power levels	Intermodulation Distortion showing 3rd and 5th order products at 2.45GHz for 3 power levels

Intermodulation Distortion (Modified Board)


1MHz Offset, LO 1.2GHz, Scale of 0.5	1MHz Offset, LO 1.2GHz, Scale of 0.25	1MHz Offset, LO 1.2GHz, Scale of 0.125

1MHz Offset, LO 2.4GHz, Scale of 0.5	1MHz Offset, LO 2.4GHz, Scale of 0.25	1MHz Offset, LO 2.4GHz, Scale of 0.125

1MHz Offset, LO 3.6GHz, Scale of 0.5	1MHz Offset, LO 3.6GHz, Scale of 0.25	1MHz Offset, LO 3.6GHz, Scale of 0.125

bandwidth (Modified Board)

Bandwidth

BW with LO of 1.2GHZ with full power out. (20dB external attenuation) |

BW with LO of 2.4GHZ with full power out. (20dB external attenuation) |

BW with LO of 3.6GHZ with full power out. (20dB external attenuation) |

Receive Specs

Response to a “chirp”

Although this doesn’t have a specific number associated with it, many RF systems are “chirpy” - and linear response to these RF pulses is very important.

Here is a 2.4GHz waveform, input at -60dbB, with the VGA gain turned up to +20dB. Although this does have some DC offset (the card was not calibrated), the response is very linear over time, even when zoomed in. (Clicking on either picture will open it up in a larger window)

And with a larger input - it looks similar. This is with an input of +6.0dBm, with the VGA set to 4.5dB.|

The results are similar at different frequencies.|

Signal to Noise

SNR

Noise floor

Input sensitivity

Dynamic range

LO BW (Modified Board)

LO Sweep from 400 MHz to 4GHz, with 0dBm input signal (Low frequency roll-off is due to Balun 3600BL14M050) |

LO Sweep from 400 MHz to 4GHz, with 0dBm input signal (With new Balun TC1-1-43A) |

Intermodulation Distortion (Modified Board)


1MHz Offset, LO 1.2GHz, 0dBm input	1MHz Offset, LO 1.2GHz, -6dBm input	1MHz Offset, LO 1.2GHz, -12dBm input

1MHz Offset, LO 2.4GHz, 0dBm input	1MHz Offset, LO 2.4GHz, -6dBm input	1MHz Offset, LO 2.4GHz, -12dBm input

1MHz Offset, LO 3.6GHz, 0dBm input	1MHz Offset, LO 3.6GHz, -6dBm input	1MHz Offset, LO 3.6GHz, -12dBm input