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SM74611: Rectification of very low-voltage AC signal - frequency AC signal 100 kHz

Antonino Proto
Prodigy 20 points
Part Number: SM74611

I am doing an application about ultrasound energy transfer.

As output of my ultrasound receiver I have an AC signal of frequency around 70 kHz and amplitude of about 150 mV. The current, flowing through an optimum resistor load, is on the order of tens of uA.

Is possible to rectify this output AC signal by doing a bridge rectifier with four SM74611 components?

Many thanks in advance

Antonino

  • 0
    TI__Genius 16305 points

    Hi 

    SM74611 can not be used for 150mV AC rectification at 70KHz and at such small current tens of uA is not going to work.

    At very low currents, SM74611 will not turn off during reverse current (during rectification).

    Regards,

    Kari.

  • 0 in reply to Karikalan Selvaraj
    Prodigy 20 points

    Hi,

    thanks for Your clarification.

    I would like to ask you:

    which are the minimum values of current for the proper functioning of the SM74611, for 70 kHz AC signal of 150mV?
    If I obtain an higher voltage output of about 300 mV, will the SM74611 work? which value of current do I need?

    regards

    Antonino

  • 0 in reply to Antonino Proto
    TI__Genius 16305 points

    Hi Antonino,

    For proper operation, at-least 500mV of AC signal is required.

    So the peak to peak has to be 1V.

    Please note that this diode is intended for reducing the forward drop of diode in high current applications where current level can be >1A or 2A or higher.

    Since this is a power device at least 1mA current would be required from load side.

    Regards,
    Kari.