35. 一個MOSFET構成的共汲極放大器，源極接一電阻 R_S=2kΩ，電晶體的小信號轉移電導 g_m=0.5mA/V 且汲極輸出電阻 r_ds=∞，則此放大器的輸出阻抗 R_O 為何？ (A) 0.5kΩ (B) 1.0kΩ (C) 1.5kΩ (D) 2.0kΩ

5. An enzyme shows strong substrate specificity, yet mutation of a single active‑site residue leads to a dramatic increase in catalytic rate but a decrease in substrate affinity. Which interpretation best fits this observation? (A)The mutation stabilizes the enzyme–substrate complex but destabilizes the transition state (B)The mutation decreases the activation energy but weakens binding interactions in the active site (C)The mutation increases both kcat and KM by stabilizing the transition state (D)The mutation eliminates a key catalytic group but improves substrate recognition

35. 一個MOSFET構成的共汲極放大器，源極接一電阻 $R_S=2k\Omega$，電晶體的小信號轉移電導 $g_m=0.5mA/V$ 且汲極輸出電阻 $r_{ds}=\infty$，則此放大器的輸出阻抗 $R_O$ 為何？
(A) $0.5k\Omega$
(B) $1.0k\Omega$
(C) $1.5k\Omega$
(D) $2.0k\Omega$

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35. 一個MOSFET構成的共汲極放大器，源極接一電阻 $R_S=2k\Omega$，電晶體的小信號轉移電導 $g_m=0.5mA/V$ 且汲極輸出電阻 $r_{ds}=\infty$，則此放大器的輸出阻抗 $R_O$ 為何？(A) $0.5k\Omega$(B) $1.0k\Omega$(C) $1.5k\Omega$(D) $2.0k\Omega$

相關試題

相關試卷

35. 一個MOSFET構成的共汲極放大器，源極接一電阻 $R_S=2k\Omega$，電晶體的小信號轉移電導 $g_m=0.5mA/V$ 且汲極輸出電阻 $r_{ds}=\infty$，則此放大器的輸出阻抗 $R_O$ 為何？
(A) $0.5k\Omega$
(B) $1.0k\Omega$
(C) $1.5k\Omega$
(D) $2.0k\Omega$