Question

2. One drawback of telescopic cascode amplifier is the difficulty in shorting their input and outputs. To study this issue, let us consider the unity-gain feedback topology shown in the following figure. VDD = 3.5 V, and all the threshold voltage of the transistors are equal to 0.5 V. $V_b = 1.4V$ $V_{OV4} = 0.2V$ $V_{OV5} = V_{OV7} = 0.3V$ (3) Using the result of problem-1, find the gain $A_1$ of the telescopic cascode amplifier to achieve a gain error of less than 1%. (20 points) (1) Using the condition that both M2 and M4 in saturation, find the range of output $V_{out}$. Use the condition of $V_x = V_b - V_{OV4}$. (10 points) ( )$\le V_{out} \le$( ) (2) Find the maximum bias voltage $V_b$, which is given by the level that places both M5 and M7 at the edge of the triode region. (10 points) $V_b = $ $A_1 = $

          2. One drawback of telescopic cascode amplifier is the difficulty in shorting their input and outputs. To study this
issue, let us consider the unity-gain feedback topology shown in the following figure. VDD = 3.5 V, and all the
threshold voltage of the transistors are equal to 0.5 V.
$V_b = 1.4V$
$V_{OV4} = 0.2V$
$V_{OV5} = V_{OV7} = 0.3V$
(3) Using the result of problem-1, find the gain $A_1$ of the telescopic cascode amplifier to achieve a gain error of less
than 1%. (20 points)
(1) Using the condition that both M2 and M4 in saturation, find the range of output $V_{out}$. Use the condition of
$V_x = V_b - V_{OV4}$. (10 points)
( )$\le V_{out} \le$( )
(2) Find the maximum bias voltage $V_b$, which is given by the level that places both M5 and M7 at the edge of the
triode region. (10 points)
$V_b = $ 
$A_1 = $

2. One drawback of telescopic cascode amplifier is the difficulty in shorting their input and outputs. To study this
issue, let us consider the unity-gain feedback topology shown in the following figure. VDD = 3.5 V, and all the
threshold voltage of the transistors are equal to 0.5 V.
Vb = 1.4V
VOV4 = 0.2V
VOV5 = VOV7 = 0.3V
(3) Using the result of problem-1, find the gain A1 of the telescopic cascode amplifier to achieve a gain error of less
than 1%. (20 points)
(1) Using the condition that both M2 and M4 in saturation, find the range of output Vout. Use the condition of
Vx = Vb - VOV4. (10 points)
( )≤ Vout≤( )
(2) Find the maximum bias voltage Vb, which is given by the level that places both M5 and M7 at the edge of the
triode region. (10 points)
Vb =
A1 =

Added by Jeremy B.

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