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Current biasing up to 100MHz

Discussion in 'Electronic Design' started by Opps, Apr 26, 2004.

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  1. Opps

    Opps Guest

    Hi, I am using the following basic and simple circuit to bias a sine
    signal:

    R3
    +/\/\/\+ Vcc
    C | +/\/\/\+ GND
    \ R2
    / R1
    \
    _+_ GND

    with C=50pF and R1=50Ohm to match the impedence of the signal generator and
    to avoid the DC reach its output. Well I adjust R2 and R3 for the correct
    bias.

    Now I need to build a current source driven proportionally with this voltage
    signal.
    I have signal up to 150MHz, current up to 350mA and the load is a LED. Which
    transistor can I use? In which configuration? Well.... in which manner can I
    optimize the LED driving considering that their resistence and capacitance
    can limit the bandwidth of the circuit?

    Thanks,
    Ale
     
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