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HMC920 Bias for HMC633

Dear Team

I am trying to use HMC920 to bias HMC633 for my Application. I have followed schematics provided in the application note and have attached the same below. 

I am able to see the LDOCC value as 5V and Vdig value and enable is pulled to Vdig but it is not generating the Vneg supply and am getting a positive Vgate of about .4V. Please help me solve my problem. I have also tried to disconnect the resistor from VNEGFB to VNEGIN but it hasn't solved the problem.

I have also tried setting a lower value for LDOCC by changing the resistor(3.6 V ) which is reflected on LDOCC but the VNEG has no change. 

Thanks in advance

Ashwin

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