26 lines
No EOL
856 B
Markdown
26 lines
No EOL
856 B
Markdown
1. Determine $R_{in}$ of a non-inverting amplifier when $A_O=200000$, $R_D=10M\Omega$, $R_f=10k\Omega$, and $R_i=1k\Omega$.
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$$
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R_{in}=R_d(1+A\beta);\ \beta={R_i\over R_i+R_f}\\
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\beta={1k\Omega\over 11k\Omega}=0.0\overline{9}\\
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R_{in}=10M\Omega(1+2_E6(0.0\overline{9}))\\
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R_{in}=10M\Omega(181818)=1.\overline{81}T\Omega
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$$
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2. Determine $R_{out}$ of a non-inverting amplifier, given the above, where $R_O=75\Omega$.
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$$
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R_{out}={r_o\over 1+A\beta};\ \beta A=181818\\
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R_{out}\approx{75\Omega\over181818}=412\mu\Omega
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$$
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3. Determine $A_{CL}$ of a non-inverting amplifier when $A_O=2000$, $R_f=10k\Omega$, and $R_i=1k\Omega$.
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$$
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A_{CL}\approx{1\over\beta};\beta=0.0\overline{9}\\
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A_{CL}=11
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$$
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4. Repeat 3 where $A_O=200000$
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$$
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A_{CL}\approx{1\over\beta}\\
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A_{CL}=11
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$$
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