Handout_2_Rev_-_Circuit_Abstraction

Handout_2_Rev_-_Circuit_Abstraction - EE 101A / Winter 10...

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1 EE 101A / Winter 10 Revised Handout #2 EE 101A Circuit Abstraction Electronics Hierarchy Three major areas of applications: Computing, Communication and Consumer. Reference – Hambley, Chapter 1.1 – 1.3, 1.6 1. Abstraction Electricity is the energy source for all electronic products. Electrical engineering is the manipulation of electricity to perform computation, communication, storage, display, sensing, actuating and other useful or entertaining functions. Electricity is described by voltage and current. However, other abstractions may be more appropriate or convenient at different levels of the hierarchy. Device Level – charge ( q ), electric filed ( E ), magnetic field ( B ) In devices, we are interested in the motion of charge under the influence of electric field or magnetic field. (EE116) Circuit Level – current ( dt dq I ), voltage ( V = Edx ) Digital Electronic Analog Electronic System System Integrated Circuit Circuit Block Device Semiconductor Atom EE116 EE101A,B EE102A,B EE108A,B
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2 A circuit is composed of devices connected in a specific fashion to perform a particular function. We are interested in the flow of currents under applied voltages. (EE101A/B) Analog System Level – signal in time or frequency domain x(t) , x(f) In analog circuit or system, we are interested in how the signal varies as a function of time or frequency. The signals, usually voltage but can be current,
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Handout_2_Rev_-_Circuit_Abstraction - EE 101A / Winter 10...

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