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# 13.5: Ejercicios

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## 13.5.1: Problemas de análisis

1. Para el amplificador de la Figura$$\PageIndex{1}$$, determinar$$Z_{in}$$ y$$A_v$$. $$V_{in}$$= 20 mV,$$I_{DSS}$$ = 10 mA,$$V_{GS(off)}$$ = −2 V,$$V_{DD}$$ = 20 V,$$R_G$$ = 750 k$$\Omega$$,$$R_D$$ = 2 k$$\Omega$$,$$R_L$$ = 4 k$$\Omega$$,$$R_S$$ = 1 k$$\Omega$$,$$R_{SW}$$ = 200$$\Omega$$.

2. Para el amplificador de la Figura$$\PageIndex{1}$$, determinar$$Z_{in}$$ y$$V_{out}$$. $$V_{in}$$= 25 mV,$$I_{DSS}$$ = 15 mA,$$V_{GS(off)}$$ = −2 V,$$V_{DD}$$ = 22 V,$$R_G$$ = 330 k$$\Omega$$,$$R_D$$ = 2 k$$\Omega$$,$$R_L$$ = 6 k$$\Omega$$,$$R_S$$ = 510$$\Omega$$,$$R_{SW}$$ = 220$$\Omega$$.

Figura$$\PageIndex{1}$$

3. Para el circuito de la Figura$$\PageIndex{2}$$, determinar$$Z_{in}$$ y$$A_v$$. $$V_{in}$$= 10 mV,$$I_{DSS}$$ = 12 mA,$$V_{GS(off)}$$ = −2.5 V,$$V_{DD}$$ = 26 V,$$R_G$$ = 510 k$$\Omega$$,$$R_D$$ = 1.2 k$$\Omega$$,$$R_L$$ = 25 k$$\Omega$$.

4. Para el circuito de la Figura$$\PageIndex{2}$$, determinar$$Z_{in}$$ y$$V_{out}$$. $$V_{in}$$= 25 mV,$$I_{DSS}$$ = 15 mA,$$V_{GS(off)}$$ = −1.5 V,$$V_{DD}$$ = 24 V,$$R_G$$ = 820 k$$\Omega$$,$$R_D$$ = 1 k$$\Omega$$,$$R_L$$ = 12 k$$\Omega$$.

Figura$$\PageIndex{2}$$

5. Para el circuito de la Figura$$\PageIndex{3}$$, determinar$$Z_{in}$$ y$$V_{out}$$. $$V_{in}$$= 25 mV,$$I_{DSS}$$ = 8 mA,$$V_{GS(off)}$$ = −3.5 V,$$V_{DD}$$ = 24 V,$$R_1$$ = 1 M$$\Omega$$,$$R_2$$ = 100 k$$\Omega$$,$$R_D$$ = 800$$\Omega$$,$$R_L$$ = 10 k$$\Omega$$.

6. Para el circuito de la Figura$$\PageIndex{3}$$, determinar$$Z_{in}$$ y$$A_v$$. $$V_{in}$$= 10 mV,$$I_{DSS}$$ = 6 mA,$$V_{GS(off)}$$ = −4 V,$$V_{DD}$$ = 26 V,$$R_1$$ = 2 M$$\Omega$$,$$R_2$$ = 120 k$$\Omega$$,$$R_D$$ = 1.2 k$$\Omega$$,$$R_L$$ = 15 k$$\Omega$$.

Figura$$\PageIndex{3}$$

7. Para el circuito de la Figura$$\PageIndex{4}$$, determinar$$Z_{in}$$ y$$V_{out}$$. $$V_{in}$$= 20 mV,$$I_{D(on)}$$ = 6 mA a$$V_{DS(on)}$$ = 3 V,$$V_{GS(th)}$$ = 2.5 V,$$V_{DD}$$ = 34 V,$$R_1$$ = 1 M$$\Omega$$,$$R_2$$ = 100 k$$\Omega$$,$$R_D$$ = 1 k$$\Omega$$,$$R_L$$ = 10 k$$\Omega$$.

8. Para el circuito de la Figura$$\PageIndex{4}$$, determinar$$Z_{in}$$ y$$A_v$$. $$V_{in}$$= 15 mV,$$I_{D(on)}$$ = 10 mA a$$V_{DS(on)}$$ = 4 V,$$V_{GS(th)}$$ = 2 V,$$V_{DD}$$ = 30 V,$$R_1$$ = 2 M$$\Omega$$,$$R_2$$ = 180 k$$\Omega$$,$$R_D$$ = 1.2 k$$\Omega$$,$$R_L$$ = 15 k$$\Omega$$.

Figura$$\PageIndex{4}$$

9. Para el circuito de la Figura$$\PageIndex{5}$$, determinar$$Z_{in}$$ y$$V_{out}$$. $$V_{in}$$= 200 mV,$$I_{DSS}$$ = 15 mA,$$V_{GS(off)}$$ = −3 V,$$V_{DD}$$ = 15 V,$$R_G$$ = 910 k$$\Omega$$,$$R_L$$ = 10 k$$\Omega$$,$$R_S$$ = 330$$\Omega$$.

10. Para el circuito de la Figura$$\PageIndex{5}$$, determinar$$Z_{in}$$ y$$V_{out}$$. $$V_{in}$$= 200 mV,$$I_{DSS}$$ = 20 mA,$$V_{GS(off)}$$ = −2 V,$$V_{DD}$$ = 12 V,$$R_G$$ = 1 M$$\Omega$$,$$R_L$$ = 1.8 k$$\Omega$$,$$R_S$$ = 220$$\Omega$$.

Figura$$\PageIndex{5}$$

11. Para el circuito de la Figura$$\PageIndex{6}$$, determinar$$Z_{in}$$ y$$A_v$$. $$I_{DSS}$$= 18 mA,$$V_{GS(off)}$$ = −2 V,$$V_{DD}$$ = 12 V,$$V_{SS}$$ = −4 V,$$R_G$$ = 680 k$$\Omega$$,$$R_L$$ = 10 k$$\Omega$$,$$R_S$$ = 1 k$$\Omega$$.

12. Para el circuito de la Figura$$\PageIndex{6}$$, determinar$$Z_{in}$$ y$$A_v$$. $$I_{DSS}$$= 20 mA,$$V_{GS(off)}$$ = −2 V,$$V_{DD}$$ = 10 V,$$V_{SS}$$ = −6 V,$$R_G$$ = 2.2 M$$\Omega$$,$$R_L$$ = 5 k$$\Omega$$,$$R_S$$ = 510$$\Omega$$.

Figura$$\PageIndex{6}$$

## 13.5.2: Problemas de diseño

13. Siguiendo el circuito de la Figura$$\PageIndex{1}$$, diseñe un amplificador con una ganancia de al menos 5 y una impedancia de entrada de al menos 500 k$$\Omega$$. $$R_L$$= 10 k$$\Omega$$. El MOSFET tiene los siguientes parámetros:$$V_{GS(off)}$$ = −2 V,$$I_{DSS}$$ = 25 mA. Intente usar valores de resistencia estándar.

14. Usando el circuito de la Figura$$\PageIndex{5}$$, diseñe un seguidor con una ganancia de al menos .75 y una impedancia de entrada de al menos 1$$\Omega$$ M. $$R_L$$= 2 k$$\Omega$$. El MOSFET tiene los siguientes parámetros:$$V_{GS(off)}$$ = −1.5 V,$$I_{DSS}$$ = 40 mA. Intente usar valores de resistencia estándar.

## 13.5.3: Problemas de desafío

15. Para el circuito de la Figura$$\PageIndex{7}$$, determinar$$Z_{in}$$ y$$A_v$$. $$I_{DSS}$$= 15 mA,$$V_{GS(off)}$$ = −2 V.

Figura$$\PageIndex{7}$$

16. Para el circuito de la Figura$$\PageIndex{8}$$, determinar$$Z_{in}$$ y$$A_v$$. $$I_{DSS}$$= 12 mA,$$V_{GS(off)}$$ = −1.5 V.

Figura$$\PageIndex{8}$$

## 13.5.4: Problemas de simulación por computadora

17. Utili$$Z_{in}$$ g hojas de datos del fabricante, encontrar dispositivos con las siguientes especificaciones (típicas) y verificarlos utilizando las técnicas de medición presentadas en el capítulo anterior.

Dispositivo 1:$$V_{GS(off)}$$ = −2 V,$$I_{DSS}$$ = 25 mA.

Dispositivo 2:$$V_{GS(off)}$$ = −1.5 V,$$I_{DSS}$$ = 40 mA.

18. Usando el modelo de dispositivo del problema anterior, verifique el diseño del Problema 13.

19. Usando el modelo de dispositivo del Problema 17, verifique el diseño del Problema 14.

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