Current booster/amplifier for OTA

Discussion in 'Analog & Mixed-Signal Design' started by raghu_ota, Jul 9, 2018.

  1. raghu_ota

    Thread Starter New Member

    Jul 6, 2018
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    I am designing an Operational Transconductance Amplifier whose maximum output current should be 15mA. Using Super Class AB amplifier, I was able to get a maximum output current of up to 2mA. The supply voltage is 5V. So to boost the output current, I need to cascade it with a current amplifier with a small gain. What would be the best way to do so? Can I get a current in mA range using CMOS current mirror technique? Or should I design another opamp and a mosfet/bjt at the output the boost the current?
     
  2. Sonoran Desert Tortoise

    Member

    Oct 30, 2014
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    62
    You should start with showing us your schematic so we can recommend changes.
     
  3. crutschow

    Expert

    Mar 14, 2008
    19,528
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    Can't you just use larger transistors in the output stage?
     
  4. raghu_ota

    Thread Starter New Member

    Jul 6, 2018
    3
    0
    Schematic.png
    This is the schematic of the OTA stage
     
  5. raghu_ota

    Thread Starter New Member

    Jul 6, 2018
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    0
    Well I am supposed to design a two-stage circuit. So I though going with a current amplifier in the second stage would be a good idea.
     
  6. danadak

    Well-Known Member

    Mar 10, 2018
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