telescopic fully differential OTA

Discussion in 'The Projects Forum' started by dasubergoober, Mar 13, 2008.

  1. dasubergoober

    Thread Starter New Member

    Mar 12, 2008
    hey i have recently been given a semester project where i have to design a telescopic fully differential OTA (see the picture). i have been given the following spesifications:
    Specification for the OTA:
    Parameter Value
    Small signal gain (dVo/dVi) > 40dB
    Unity gain frequency (f0) > 600MHz
    Input common mode VDD/2 +- 300mV
    Output common mode VDD/2 +- 300mV
    Input common mode swing +- 100mV
    Output swing 1 VPP (differential peak to peak)
    VDD 1.5V
    Maximum ID 5 mA
    Power Minimize
    Load at VOUTN & VOUTP < 0.9pF
    Minimum VEFF 110mV
    Min VS 200 mV

    the project consists of the following two tasks.
    1. Choose the correct values for the drain current (ID = I1 = I2 = I0/2), M0, M1, M2, M3, input common mode, output common mode, VB such that specification given below is achieved.
    2. Design the current source I0 including the bias network for I0, and the voltage VB. (need not design I1 or I2)

    i am totally in the dark as to where i am supposed to start:S can someone give me a push in the right direction?!?
    • OTA.bmp
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