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AMC7836: Memory Integration with AMC7836 based PA biasing circuit

Suddha Satya Deb
Prodigy 10 points

Part Number: AMC7836
Other Parts Discussed in Thread: LMP92066

Hardware Query Type: Reference Schematics and feasibility of Operation

Hi Experts!

We want to use the AMC7836 for GaN High Power Amplifier Biasing. Along with that, we want to integrate an external SPI-based memory into the Circuit, which allows the Bias controller (AMC7836) to automatically operate based on a pre-programmed flow of operation. Provided the memory is programmed once every power-up cycle of the system. In this regard I have some doubts and would appreciate some help: 

  1. Is the above operation feasible with the AMC7836 device?  Since AMC7836 looks like an SPI Slave device.   
  2. Any Reference schematics for the above operation (if available), particularly the Memory integration part.
  3. Concerning the PA Biasing circuit, Can the Bias Controller GND be directly shorted to the RF GND in layout?  (Provided the gate has a knee voltage of -5V and is biased at around -2.75 V, at a Drain voltage of 48V. The Gate Voltage is coming from the AMC7836 DAC Groups. 

Any help on the above topic is highly appreciated. Thank you. 

  • 0
    TI__Guru 56523 points

    Hi Suddha,

    The AMC7836 is a SPI slave, so it would still require a controller to program the device and extract the programming values from the non-volatile memory.  

    Could you consider a device like the LMP92066? This device features fewer channels but integrates EEPROM memory and closed-loop controller.   You would program the device in production, and it would operate autonomously after that.

    Thanks,

    Paul