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TRF1208: design for SE2DIFF or DIFF2SE application

asaf barom
Prodigy 20 points
Part Number: TRF1208
Other Parts Discussed in Thread: , TRF1108

Tool/software:

Hello,


I am using the TRF1208 (RF FULLY DIFFERENTIAL AMPLIFIER - FDA) and I would like to implement the conversion of a differential signal to a single-ended signal using this component.
Additionally, I want to implement the conversion of a single-ended signal to a differential signal using another TRF1208 component.

The frequency ranges I am working with are C, S, and L BANDS.
Are there any examples or recommendations on how to properly perform these conversions while maintaining signal integrity and preventing amplitude issues or signal distortion?

Thank you in advance for any help or guidance!

  • +1
    TI__Intellectual 1200 points

    Hi there Asaf,

    In section 8 of the TRF1208 datasheet, starting at page 25, there is some good collateral on specific components required to use this amplifier in either a single to differential or differential to single configuration.

    This performance can be evaluated using either the discrete TRF1208EVM (only S2D) or by purchasing the TRF1208-AFE7950-EVM, which contains the two configurations of the TRF1208 you are referencing here. Design files such as BOM and board layouts are available for this EVM for reference purposes. 

    In general, to use an FDA as a single to differential or differential to single converter, tie the undesired input/output minus pin to ground through a 50 ohm resistor and then treat the remaining input/output as single ended. You will generally see 3 dB less gain compared to FDA configuration. 

    If DC coupling is required, additional components may be needed to source/sink common mode currents as well as careful supply voltage choices. If not DC coupling, then ensure to place DC blocking capacitors at all RF input/outputs to the device, including the unused input/output minus pin.

    Almost all of the data in the TRF1208 datasheet is taken in Single ended to Differential operation. For differential to single, we also now have the TRF1108, which is a dedicated differential to single ended amplifier, and may give better performance and has more collateral than by using the TRF1208 in differential to single ended mode. 

    Let me know if you want to set up a call to go over this to look at some specifics, or if there is anything else I can help with. Thanks,
    Gideon