Other Parts Discussed in Thread: LMX2572, PLLATINUMSIM-SW, LMX2594
I am using LMX2572 Evaluation board. Below are issues faced
Our application is to run the evaluation board in Sawtooth Auto Ramp mode with >1ms. We are sweeping 5800-5900MHz for a Radar application.
The sweep is not happening properly, attached is the ramp setting screen shot for reference
1. The PLL is not stable with the loop filter values of 1MHz:
C1_LF: 15 pF
C2_LF: 450 pF
R2_LF: 2.5 k
R3_LF: 0
C3_LF: DNP (open)
R4_LF: 0
C4_LF: DNP (open)
Apart from this,
R16, R19, R20: 0 Ohms (short)
We have tried changing the loop filter values, the PLL is not stable even in higher bandwidth.
I need solution for stable PLL output and sweep from 5800-5900MHz,in sawtooth ramp mode ASAP.
Regards,
Suresh