# Review for Final Exam MOSFET and BJT Basis

Review for Final Exam

MOSFET and BJT Basis of amplifiers Obtaining linear amplification

Small-signal voltage Gain Equivalent-circuit models: model and T model Basic configurations and Biasing Analyze discrete-circuit amplifiers MOSFET

1 2 = h ) (1+ ) ( 2

( ) =

[ ] 1

hh hh = BJT

Collector current Base current Emitter current

VT : the thermal potential is common-emitter current gain Minority-Carrier Distribution

Equivalent Circuit Models 6.3 BJT Circuit at DC Use simple model: |VBE|=0.7V for a conducting transistor and |VCE|=0.2V for a saturated transistor

Accurate model will increase complexity and impede insight in design SPICE simulation in the final stage of design Basis of amplifiers

7.1.3 The voltage-transfer characteristics VTC is non-linear: For BJT: Obtaining Linear Amplification by Biasing the

Transistor A dc voltage VGS is selected to obtain operation at a point Q on the segment AB of the VTC Q: bias point or dc operation point, or quiescent point

The signal to be amplified is vgs(t) Example 7.1 Solution: VGS=0.6V, VOV=0.2V

13 Small-Signal Operation and Models 7.2.1 The MOSFET Case 14

The signal current in the drain terminal Small-signal condition: 15

Small-signal voltage gain Modeling the Body effect 17

Collector current and Transcoductance If: 18 Equivalent

circuit models 19 20

Configurations 7.4 Biasing 1. To establish in the drain (collector) a dc current that is predictable, and insensitive to

variations in temperature and to large variations in parameter values between devices of the same type; 2. To locate the dc operating point in the active region and allow required output signal swing without the transistor leaving the

active region. 22 Biasing The MOSFET case

- E.g., biasing by fixing VG and connecting a Rs Example 7.11 Solution: design the resistance by distributing VDD into 3 equal part on RD, transistor VDS and RS

(each part = 5 V) 24 7.5 Discrete-Circuit Amplifiers (self-reading) A. A common-source (CS) amplifier

25 C. A CE amplifier with an emitter resistance Re With Re must use T Model

26

## Recently Viewed Presentations

• Arial Calibri Default Design Unit 1: Our World Weekly Theme: People and Their Pets Selection 5: Title: The Perfect Pet Author: Margie Palatini Genre: Humorous Fiction- a made-up story written to make people laugh Comprehension Strategy: Analyze Story Structure Comprehension...
• A nonadaptive agent is one that decides by the round number, ignoring the outcomes from all previous rounds. It effectively generates a constant string of bits, regardless of the actions of the other player. By constraining one player to be...
• Update on Legal Developments in IDEA, ADA, & Section 504. Ne-pact regional conference ... Failure to conduct adequate Functional Behavioral Assessment is serious procedural violation because it may prevent IEP team from obtaining necessary information about student's behaviors, leading to...
• Acknowledgements Gene Shippentower Debbie Docherty Ericka Hegeman Teara Farrow Jeanette Howard Julie Burke Gary James Tamao Kasahara Danielle Kreeger Karen Mock Eric Quaempts Celeste Reeves David Wolf Jr. Donna Nez Melissa Van Pelt Bryan Black Jeremy Wolf Andrew Wildbill *...
• case that the relevant regulations, created under the Welfare Reform Act 2012, had not taken into account a need for compliance with the UNCRC - but the majority of the UK Supreme Court held that the rule that the UK...
• Conflict of Interest for Research Administrators ... Dr. Catherine D. DeAngelis, Editor in Chief, JAMA You have 10% ownership in a company. The company is worth less than \$10K. ... Times New Roman Tahoma Gill Sans Ultra Bold Condensed Arial...
• The Purpose of YahwehGenesis - Malachi. To fill the earth with his Glory - a creation that reflects his own character. (It was "VERY GOOD") To punish the wickedness of sin. Earth cursed. To sanctify himself in his chosen people
• Primary pornography consumer group is boys between the ages 12-18. Who is at risk? Adolescent children (as young as 11 years of age) Males . College Students. ... William Struthers . Resources for educators and parents. Articles: Archer, C. Austin....