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AD9364 dirty transmission beginning

Question asked by beeaaver on Jul 9, 2014
Latest reply on Jul 14, 2014 by tlili


I am working on AD9364 and I see a very strange transient at the beginning of a transmission.

The device is initialized and configured using the non-OS driver.

Transmitted signal is a clean CW (constant value on digital data port).

The state machine is controlled via ENABLE and TXRXN discreets.

After a rising edge of the ENABLE signal, in Tx mode, there is an odd transient, as shown in the following zero span measurement:



Unsurprisingly, this transient causes a lot of spurs all over the nearby spectrum (few Megs).

Is that considered normal?

Is there any way to avoid or suppress this transient?