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Lecture L
• Mid-term in ~2 weeks. Covers all materials we covered up that date (lectures and labs)
• You can bring one page (letter format), handwritten on one side to the mid-term exam.
• Optional exam review and Q&A session on Thursday Oct. 18, 1-1:50pm in G125.
• Keep thinking about your final projects! (Proposal due in 4 weeks) Check out the guidelines and a list of previous projects on the course web page.
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MOSFET:Current is conducted on the surface of the semiconductor.Surface-contamination is an issue (causes current noise.)
JFET:Current is conducted in the (high quality) bulk of the semiconductor lower noise
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Our Trusty LF356: Inputs are JFETs (low noise, high impedance), but most gain is provided by BJTs.
Inputs are JFETsgain is provided by BJTs
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M1
What is the transconductance gfs for the JFET in the saturated region (VDS > 4V) for VGS biased at 0V?
A) 1 mSB) 2 mSC) 5 mSD) 10 mSE) 15 mS
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M2
What is IDSS for this JFET?
A) 3 mAB) 5 mAC) 7.5 mAD) 10.5 mAE) 12 mA
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What is Vout for a common source amplifier?
M3
A)VDD - RD ID
B) Vin - RD ID
C) VDD - gfs RD ID
D)Vin - gfs RD ID
E) other
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M4
A) 0 VB) 4 VC) 5 VD) 6 VE) 10 V
What is Vout with the gate grounded?
ID
VDS
VGS = 0V
VGS = -0.2V
VGS = -0.6V
VGS = -1.5V
4mA
3mA
2mA
1mA
5V
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M5
What is the magnitude of the gain with VGS biased at 0V?
A) 0 B) 0.5 C) 1 D) 5 E) 10
ID
VDS
VGS = 0V
VGS = -0.2V
VGS = -0.6V
VGS = -1.5V
4mA
3mA
2mA
1mA
5V
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M6
What is the approximate output impedance of the common source amp?
A) 10 WB) 500 W C) 1000 W D) 2000 W E) 1012 W
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M7
Vout of the amplifier is initially 6V. Next, I put a 1000 W resistor to ground on the output. What is Vout now? (Assume gfs is unchanged by this.)
A) 1 VB) 3 VC) 6 VD) 10 VE) 12 V
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M8
What is the input impedance of the circuit at DC?
A) 10 WB) 500 W C) 1000 W D) 2000 W E) 1012 W