1. 전자 회로 1 Lecture 8 (MOSFET-III)
임한조
아주대학교 전자공학부
이 강의 노트는 전자공학부 곽노준 교수께서 08.03에 작성한 것으로 노트제공에 감사드림.

2. Single-stage MOS Amplifier - Biasing
May, 2008
Nojun Kwak

3. The Common-Source (CS) Amp.
May, 2008
Nojun Kwak

4. May, 2008
Nojun Kwak

5. The CS with a Source Resistance
Source쪽에 저항이 있으면 T-model이 편함
May, 2008
Nojun Kwak

6. May, 2008
Nojun Kwak

7. The Common-Gate (CG) Amp.
May, 2008
Nojun Kwak

8. Unity current gain (current follower) 좋은 주파수 특성
- Non-inverting
Low input resistance
Unity current gain (current follower)
좋은 주파수 특성
(high freq. response가 좋음)
May, 2008
Nojun Kwak

9. The Common-Drain (Source Follower)
May, 2008
Nojun Kwak

10. - Non-inverting high input resistance Low output resistance
Unity voltage gain
(voltage follower)
May, 2008
Nojun Kwak

11. Summary: Single-stage MOS AMP.
May, 2008
Nojun Kwak

12. May, 2008
Nojun Kwak

13. Internal Capacitance (MOSFET)
May, 2008
Nojun Kwak

14. MOS Gate Capacitance
May, 2008
Nojun Kwak

15. MOS Junction Capacitance
Internal capacitance 크기:
fF (10-15 F) to pF (10-12 F) (see Ex. 4.36)
Cf.) Coupling cap. ~ 10-6 F
May, 2008
Nojun Kwak

16. MOSFET High Frequency Model
May, 2008
Nojun Kwak

17. MOS Internal Capacitances (high freq model)
May, 2008
Nojun Kwak

18. High Freq. Small Signal Model
May, 2008
Nojun Kwak

19. MOSFET Unity Gain Freq. (fT)
* fT ~= 100MHz (old tech.) / several GHz (new tech.)
May, 2008
Nojun Kwak

20. The CMOS Digital Logic Inverter
May, 2008
Nojun Kwak

21. The depletion type MOSFET
Inversion layer를 미리 만들어 놓음.
NMOS인 경우: Gate 밑에 n형으로 살짝 doping
Vt < 0: channel이 없어지는 voltage
VGS = 0일 때도 VDS > 0이면 전류가 흐름
May, 2008
Nojun Kwak

22. 전류-전압 특성 (depletion type MOS)
May, 2008
Nojun Kwak

23. 비교 (Depletion vs. Enhancement)
May, 2008
Nojun Kwak