Fast Voltage-Driven Current Source


Posted on Feb 6, 2014

The current source in the diagram, which react very fast to changes in the input signal, may be used, for instance, in certain measurements. Differential amplifier IC1 ensures that the potential across R2 is equal to the input voltage: Iout =Uin/R2. The bandwidth, B, is given by B=R2 f /RL, where f=80 MHz, and the load impedance RL‰¥ R2 (both in


Fast Voltage-Driven Current Source
Click here to download the full size of the above Circuit.

ohms). The input is terminated into R1 to give the usual 50 impedance required by measuring instruments. At the same time, this resistor sets the d. c. operating point. If the link to the driving signal source is short and d. c. coupled, R1 may be omitted. The peak voltage between pins 1 and 2 of the IC is limited to 2. 1 V to prevent too large a current at the output. Therefore, the peak output current is 2. 1/100=21 mA.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Clock using a Hard Drive
    Stable Vfo
    All in one Remote using Arduino
    Softrock RX + Xtall V9.0 USB Control Stage
    simple current controlled led tube
    Amplifier Circuit Output Relay Delay Audio
    DSP Mixed Signal Solutions for Multi Channel Audio
    WhirlyGIG
    Mag Loop
    Quick-Charge Auto-Fire Flash Circuit
    Disconnect anti theft alarm circuit
    Intermittent start and stop cycle control circuit Five of a



    Top