Question

Parameter NIMOS PMOS $V_{TO}$ +0.8 V -0.8 V $\gamma$ 0.5 $V^{1/2}$ 0.5 $V^{1/2}$ $\lambda$ 0.6 V 0.6 V $K'$ 100 $\mu A/V^2$ 40 $\mu A/V^2$ $L_{min}$ 0.25 $\mu m$ 0.25 $\mu m$ $C_{ox}$ 20 fF/$\mu m^2$ 20 fF/$\mu m^2$ 1. (8 pts.) If the circuit needs to generate a periodic output signal ($v_o$) with frequency of about 120 kHz, and that is roughly 'high' 60% of the time and 'low' 40% of the time, which of the below components would you pick for $R_a$, $R_b$, and C. You may use a component value more than once. Show the details of your calculations for full credit. 120pF, 240pF, 1.2nF, 4.8nF, 12nF, 1k$\Omega$, 2k$\Omega$, 3k$\Omega$, 4k$\Omega$, 5k$\Omega$, 6k$\Omega$, 8k$\Omega$, 9k$\Omega$, 10k$\Omega$

          Parameter
NIMOS
PMOS
$V_{TO}$ +0.8 V -0.8 V
$\gamma$ 0.5 $V^{1/2}$ 0.5 $V^{1/2}$
$\lambda$ 0.6 V 0.6 V
$K'$ 100 $\mu A/V^2$ 40 $\mu A/V^2$
$L_{min}$ 0.25 $\mu m$ 0.25 $\mu m$
$C_{ox}$ 20 fF/$\mu m^2$ 20 fF/$\mu m^2$
1. (8 pts.) If the circuit needs to generate a periodic output signal ($v_o$) with frequency of about 120 kHz,
and that is roughly 'high' 60% of the time and 'low' 40% of the time, which of the below components
would you pick for $R_a$, $R_b$, and C. You may use a component value more than once. Show the details
of your calculations for full credit.
120pF, 240pF, 1.2nF, 4.8nF, 12nF, 1k$\Omega$, 2k$\Omega$, 3k$\Omega$, 4k$\Omega$, 5k$\Omega$, 6k$\Omega$, 8k$\Omega$, 9k$\Omega$, 10k$\Omega$

Parameter
NIMOS
PMOS
VTO +0.8 V -0.8 V
γ 0.5 V^1/2 0.5 V^1/2
λ 0.6 V 0.6 V
K' 100 μ A/V^2 40 μ A/V^2
Lmin 0.25 μ m 0.25 μ m
Cox 20 fF/μ m^2 20 fF/μ m^2
1. (8 pts.) If the circuit needs to generate a periodic output signal (vo) with frequency of about 120 kHz,
and that is roughly 'high' 60% of the time and 'low' 40% of the time, which of the below components
would you pick for Ra, Rb, and C. You may use a component value more than once. Show the details
of your calculations for full credit.
120pF, 240pF, 1.2nF, 4.8nF, 12nF, 1kΩ, 2kΩ, 3kΩ, 4kΩ, 5kΩ, 6kΩ, 8kΩ, 9kΩ, 10kΩ

Added by Joseph S.

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