Error during ADRV9026 high-level API init. sequence

Question

Dear all, 
 I tried to perform the initialization sequence for ADRV9026, but there was an error after carrying out the Post MCS Sequence (adi_adrv9025_PostMcsInit) and I honestly do not know how to deal with it. Moreover, I tracked down the error which regarded the following functions: 
 errFunc	const char *	adi_adrv9025_CpuCmdStatusWait	
errFile	const char *	../src/devices/adrv9025/public/src/adi_adrv9025_cpu.c	
varName	const char *	device	
errormessage	const char *	CpuCmdStatusWait() failed due to thrown CPU error. Is device in correct state for calling command?	

errFunc	const char *	adrv9025_CpuCmdErrorHandler	
errFile	const char *	../src/devices/adrv9025/private/src/adrv9025_cpu.c	
varName	const char *	mailboxErrCode	
errormessage	const char *	TIARx:No solution for RX 

errFunc	const char *	adi_adrv9025_PostMcsInit	
errFile	const char *	../src/devices/adrv9025/public/src/adi_adrv9025_utilities.c	
varName	const char *	((void *)0)	
errormessage	const char *	TIARx:No solution for RX 
 It is worth mentioning that not only the platform is a custom board, but also each Rx channel's input is connected to the differential pins of a balun (1720BL15A0100) which its input is not present/driven. 
 In addition, I attach initdata.c and the log file for further details. 
 Best regards,

Ramarao · Accepted Answer

It could be matching issue at the ports. Please check the matching on the board, for eg, Balun, matching components etc..)

JNPH · Answer

There was no issue regarding the matching but the component connected to the RF balun's pin GND/DC_FEED+RFGND.

Analog indicates in UG1727 (pag. 218-221) that a 0-Ohm resistor should be connected from the aforementioned pin to GND for the 650...2800-MHz freq. band. However, this does not make any sense from my point of view, more even so that Analog suggests placing a cap. for the other freq. bands. Hence, I placed a 1-nF and 100-pF cap. instead of R305 and C305 respectively, such that they would not only behave as a short circuit at the operation freq. range, but also bypass the bias voltage of the Rx. ch.'s output. It is worth mentioning that I did the same for all Rx. and Obs. Rx. channels. 
 In the end, the initialization sequence was successful without excluding the TIA and QEC cal. in the Post MCS Sequence.

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Error during ADRV9026 high-level API init. sequence