Is there an Op Amp that can clamp the output at  5V (unipolar operation)?

Will operate a +1 gain.  Want to operate with +12V supply voltage.  Need 100kHz BW and clamp response time <1us. 

Originally considered the AD8036, but clamp voltage is limited to 3.9V and supply voltage limited to 5V. 

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  • 0
    •  Analog Employees 
    on Jul 13, 2017 10:19 AM

    Hi Ted,

     

    According to one of our colleagues, AD8036 and AD8037 are the only clamping amplifiers that Analog Devices have.

    AD8036 operates at +1 gain while AD8037 operates at +2 gain.

    AD8036 is guaranteed to operate on maximum of +/-6V of supply voltage or 12V to ground on single supply. It has 1.5ns clamp overdrive recovery and bandwidth is at 195MHz when Vout is 3.5V p-p.

     

    You can run the part on a single supply configuration with +Vs = 12V and –Vs = 0 and/or dual supply of +/-6V configuration, but always allow for 1V of headroom on the output regardless of the clamping voltage.

     

    So If you want the output voltage to be clamped at around 5V single supply operation, you can put your supply voltage +Vs to at least 6V since you need a headroom of 1V (typical) from the supply rails. This is also means that when the –Vs is connected to ground, the low clamping level at the output will also be around 1V due to the said headroom. If you want to make the low clamping level to 0V, if it is necessary on your application, then dual supply is needed to account for the required output headroom.

     

    If you have further questions, please let us know.

Reply
  • 0
    •  Analog Employees 
    on Jul 13, 2017 10:19 AM

    Hi Ted,

     

    According to one of our colleagues, AD8036 and AD8037 are the only clamping amplifiers that Analog Devices have.

    AD8036 operates at +1 gain while AD8037 operates at +2 gain.

    AD8036 is guaranteed to operate on maximum of +/-6V of supply voltage or 12V to ground on single supply. It has 1.5ns clamp overdrive recovery and bandwidth is at 195MHz when Vout is 3.5V p-p.

     

    You can run the part on a single supply configuration with +Vs = 12V and –Vs = 0 and/or dual supply of +/-6V configuration, but always allow for 1V of headroom on the output regardless of the clamping voltage.

     

    So If you want the output voltage to be clamped at around 5V single supply operation, you can put your supply voltage +Vs to at least 6V since you need a headroom of 1V (typical) from the supply rails. This is also means that when the –Vs is connected to ground, the low clamping level at the output will also be around 1V due to the said headroom. If you want to make the low clamping level to 0V, if it is necessary on your application, then dual supply is needed to account for the required output headroom.

     

    If you have further questions, please let us know.

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