PDA(Photo Detector Amplifier)circuit

Discussion in 'The Projects Forum' started by Srujana, Jan 23, 2010.

  1. Srujana

    Thread Starter New Member

    Jan 23, 2010
    In the PDA(photo detector amplifier) there 3 stages used-1. FET,2.BJT,3.Op Amps...curent is abt 70 nano amps peak 2 peak n requird voltage is 4 vots with a bandwith xpected 2mhz,plz tel me y v shuld use fet in d frst stage...wht wil hapend if u use BJT & Opamp.Can any1 provide me a circuit 4 requirements:-
    1.Supply voltage- +15v,-15v,+5v
    2.Input current- 70 nano amps peak 2 peak
    3.Output voltage- 4 volts peak 2 peak
    4.Bandwith- 2Mhz
    6.Temperature: -40 to 70°C