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Design self bias circuit using JFET for midpoint biasing. Let $I_{DSS}= 8mA, V_p= -3V$
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Step 1: Circuit Diagram

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Step 2: Finding $I_{DSQ} and V_{GSQ}$

Since mid-point biasing is mentioned then,

$I_{DSQ}=\frac{1}{2}I_{DSS}=\frac{1}{2}\times8mA$

$I_{DSQ}=4mA$

We know that,

$I_{DSQ}=I_{DSS}(1-\frac {V_{GSQ}}{V_P})^2$

$4mA=8mA(1+\frac{V_{GSQ}}{3})^2$

$V_{GSQ}=-0.87V$

Step 3: Finding Rs

$V_{GS}=-I_{DSQ}\times R_s$

$-0.87=-4mA\times R_s$

$R_s=217.5\Omega$

Step 4: Finding Rd

Apply KVL from $V_{DD}$ to Ground,

$V_{DD}-I_{DSQ}(Rd+Rs)-V_{DSQ}=0$

Since mid point biasing is …

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