전자 회로 1 lecture 8 (mosfet-iii) 2009. 05. 임한조 아주대학교 전자공학부...
Post on 19-Dec-2015
261 views
TRANSCRIPT
전자 회로 1Lecture 8 (MOSFET-III)
2009. 05.임한조
아주대학교 전자공학부[email protected]
이 강의 노트는 전자공학부 곽노준 교수께서 08.03 에 작성한 것으로 노트제공에 감사드림 .
May, 2008 Nojun Kwak 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
Source 쪽에 저항이 있으면 T-model 이 편함
May, 2008 Nojun Kwak 6
May, 2008 Nojun Kwak 7
The Common-Gate (CG) Amp.
May, 2008 Nojun Kwak 8
- Non-inverting- Low input resistance- Unity current gain (current follower)- 좋은 주파수 특성 (high freq. response 가 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 layer 를 미리 만들어 놓음 . NMOS 인 경우 : Gate 밑에 n 형으로 살짝 doping Vt < 0: channel 이 없어지는 voltage VGS = 0 일 때도 VDS > 0 이면 전류가 흐름
May, 2008 Nojun Kwak 22
전류 - 전압 특성 (depletion type MOS)
May, 2008 Nojun Kwak 23
비교 (Depletion vs. Enhancement)