# 12.8: Exercises

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## 12.8.1: Analysis Problems

1. For the circuit of Figure $$\PageIndex{1}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{DSS}$$ = 20 mA, $$V_{GS(off)}$$ = −6 V, $$V_{DD}$$ = 15 V, $$R_G$$ = 470 k$$\Omega$$, $$R_S$$ = 1.2 k$$\Omega$$, $$R_D$$ = 1.8 k$$\Omega$$.

2. For the circuit of Figure $$\PageIndex{1}$$, determine $$I_D$$, $$V_{DS}$$ and $$V_D$$. $$I_{DSS}$$ = 20 mA, $$V_{GS(off)}$$ = −5 V, $$V_{DD}$$ = 30 V, $$R_G$$ = 560 k$$\Omega$$, $$R_S$$ = 420 $$\Omega$$, $$R_D$$ = 1.5 k$$\Omega$$.

Figure $$\PageIndex{1}$$

3. For Figure $$\PageIndex{2}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{DSS}$$ = 15 mA, $$V_{DD}$$ = 25 V, $$V_{GS(off)}$$ = −3 V, $$V_{SS}$$ = −6 V, $$R_G$$ = 820 k$$\Omega$$, $$R_S$$ = 2 k$$\Omega$$, $$R_D$$ = 3.6 k$$\Omega$$.

4. For the circuit of Figure $$\PageIndex{2}$$, determine $$I_D$$, $$V_{DS}$$ and $$V_D$$. $$I_{DSS}$$ = 18 mA, $$V_{GS(off)}$$ = −3 V, $$V_{DD}$$ = 30 V, $$V_{SS}$$ = −9 V, $$R_G$$ = 910 k$$\Omega$$, $$R_S$$ = 1.2 k$$\Omega$$, $$R_D$$ = 2.7 k$$\Omega$$.

5. For the circuit of Figure $$\PageIndex{3}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{DSS}$$ = 12 mA, $$V_{GS(off)}$$ = −4 V, $$V_{DD}$$ = 35 V, $$R_G$$ = 680 k$$\Omega$$, $$R_D$$ = 1.8 k$$\Omega$$.

Figure $$\PageIndex{2}$$

6. For the circuit of Figure $$\PageIndex{3}$$, determine $$I_D$$, $$V_{DS}$$ and $$V_D$$. $$I_{DSS}$$ = 8 mA, $$V_{GS(off)}$$ = −2 V, $$V_{DD}$$ = 30 V, $$R_G$$ = 750 k$$\Omega$$, $$R_D$$ = 2.7 k$$\Omega$$.

Figure $$\PageIndex{3}$$

7. For the circuit of Figure $$\PageIndex{4}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{DSS}$$ = 8 mA, $$V_{GS(off)}$$ = −4 V, $$V_{DD}$$ = 30 V, $$R_1$$ = 2.7 M$$\Omega$$, $$R_2$$ = 110 k$$\Omega$$, $$R_D$$ = 470 $$\Omega$$.

8. For the circuit of Figure $$\PageIndex{4}$$, determine $$I_D$$, $$V_{DS}$$ and $$V_D$$. $$I_{DSS}$$ = 12 mA, $$V_{GS(off)}$$ = −6 V, $$V_{DD}$$ = 20 V, $$R_1$$ = 2 M$$\Omega$$, $$R_2$$ = 100 k$$\Omega$$, $$R_D$$ = 680 $$\Omega$$.

9. For the circuit of Figure $$\PageIndex{5}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{D(on)}$$ = 8 mA, $$V_{GS(on)}$$ = 5 V, $$V_{GS(th)}$$ = 3 V, $$V_{DD}$$ = 30 V, $$R_1$$ = 2 M$$\Omega$$, $$R_2$$ = 330 k$$\Omega$$, $$R_D$$ = 1.2 k$$\Omega$$.

10. For the circuit of Figure $$\PageIndex{5}$$, determine $$I_D$$, $$V_{DS}$$ and $$V_D$$. $$I_{D(on)}$$ = 12 mA, $$V_{GS(on)}$$ = 6 V, $$V_{GS(th)}$$ = 2.5 V, $$V_{DD}$$ = 25 V, $$R_1$$ = 1.5 M$$\Omega$$, $$R_2$$ = 470 k$$\Omega$$, $$R_D$$ = 680 $$\Omega$$.

Figure $$\PageIndex{4}$$

Figure $$\PageIndex{5}$$

11. For the circuit of Figure $$\PageIndex{6}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{DSS}$$ = 12 mA, $$V_{GS(off)}$$ = 2 V, $$V_{DD}$$ = −25 V, $$R_G$$ = 470 k$$\Omega$$, $$R_S$$ = 800 $$\Omega$$, $$R_D$$ = 1.8 k$$\Omega$$.

12. For the circuit of Figure $$\PageIndex{6}$$, determine $$I_D$$ and $$V_D$$. $$I_{DSS}$$ = 10 mA, $$V_{GS(off)}$$ = 2 V, $$V_{DD}$$ = −20 V, $$R_G$$ = 560 k$$\Omega$$, $$R_S$$ = 680 $$\Omega$$, $$R_D$$ = 1.5 k$$\Omega$$.

Figure $$\PageIndex{6}$$

13. For the circuit of Figure $$\PageIndex{7}$$, determine $$I_D$$, $$V_G$$ and $$V_D$$. $$I_{DSS}$$ = 14 mA, $$V_{GS(off)}$$ = 3 V, $$V_{DD}$$ = −25 V, $$V_{SS}$$ = 6 V, $$R_G$$ = 780 k$$\Omega$$, $$R_S$$ = 2 k$$\Omega$$, $$R_D$$ = 3.3 k$$\Omega$$.

Figure $$\PageIndex{7}$$

14. For the circuit of Figure $$\PageIndex{7}$$, determine $$I_D$$ and $$V_D$$. $$I_{DSS}$$ = 16 mA, $$V_{GS(off)}$$ = 3.5 V, $$V_{DD}$$ = −20 V, $$V_{SS}$$ = 7 V, $$R_G$$ = 1 M$$\Omega$$, $$R_S$$ = 1.5 k$$\Omega$$, $$R_D$$ = 2.2 k$$\Omega$$.

15. For the circuit of Figure $$\PageIndex{8}$$, determine $$I_D$$ and $$V_D$$. $$I_{DSS}$$ = 11 mA, $$V_{GS(off)}$$ = 2 V, $$V_{DD}$$ = −24 V, $$R_G$$ = 750 k$$\Omega$$, $$R_D$$ = 1.2 k$$\Omega$$.

16. For the circuit of Figure $$\PageIndex{8}$$, determine $$I_D$$ and $$V_D$$. $$I_{DSS}$$ = 9 mA, $$V_{GS(off)}$$ = 3 V, $$V_{DD}$$ = −18 V, $$R_G$$ = 430 k$$\Omega$$, $$R_D$$ = 910 $$\Omega$$.

Figure $$\PageIndex{8}$$

## 12.8.2: Design Problems

17. Using the circuit of Figure $$\PageIndex{1}$$, determine a value for $$R_S$$ to set $$I_D$$ to 4 mA. $$I_{DSS}$$ = 10 mA, $$V_{GS(off)}$$ = −2 V, $$V_{DD}$$ = 18 V, $$R_G$$ = 470 k$$\Omega$$, $$R_D$$ = 1.5 k$$\Omega$$.

Figure $$\PageIndex{9}$$

18. For the circuit of Figure $$\PageIndex{9}$$, determine $$R_D$$ and $$R_G$$ to set $$I_D$$ = 10 mA. $$I_{D(on)}$$ = 15 mA, $$V_{GS(on)}$$ = 6 V, $$V_{GS(th)}$$ = 2 V, $$V_{DD}$$ = 20 V.

19. For the circuit of Figure $$\PageIndex{9}$$, determine $$R_D$$ and $$R_G$$ to set $$I_D$$ = 15 mA. $$I_{D(on)}$$ = 10 mA, $$V_{GS(on)}$$ = 5 V, $$V_{GS(th)}$$ = 2 V, $$V_{DD}$$ = 25 V.

## 12.8.3: Challenge Problems

20. Using the circuit of Figure $$\PageIndex{2}$$, determine values for $$R_D$$, $$R_S$$ and $$V_{SS}$$ to set $$I_D$$ to 5 mA and $$V_D$$ to 20 V. $$I_{DSS}$$ = 15 mA, $$V_{GS(off)}$$ = −3 V, $$V_{DD}$$ = 30 V, $$R_G$$ = 560 k$$\Omega$$.

21. Using the circuit of Figure $$\PageIndex{10}$$, determine values for $$R_D$$ to set $$V_D$$ to 15 V. $$I_{DSS}$$ = 10 mA, $$V_{GS(off)}$$ = 3 V, $$V_{SS}$$ = 25 V, $$R_G$$ = 680 k$$\Omega$$.

Figure $$\PageIndex{10}$$

Figure $$\PageIndex{11}$$: Comic courtesy of xkcd.com

This page titled 12.8: Exercises is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James M. Fiore via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.