Physics 120A Final Exam  you have 120 minutes to finish!
First, breath. Next, please sIgn this sheet and sign and number all sheets used for this
exam. Then set up your test board so that all power lines ( 15 V and + 5 V) and the
ground are in place. Get
Load line analysis for a diode circuit (I versus VD)
A plot of the current, I, versus the voltage drop across the diode, VD, will yield a straight
line, called the "Load Line", of possible values of current flow in the circuit. We form the
line by noting
Physics 120  David Kleinfeld  Spring 2017
1
Notes on Fourier series of periodic functions
1.1
Background
Any temporal function can be represented by a multiplicity of basis sets. When
the function is assumed to exist for all of time, a not unreasonable
Physics 120  David Kleinfeld  Spring 2017
1
Notes on time domain circuit analysis
1.1
Background
The most common firstorder differential equation in circuit analysis, such as for a
RC highpass or lowpass filter, has constant coefficients and is of th
Physics 120  David Kleinfeld  Spring 2017
1
1.1
Notes on diode analysis
Background
Mass action says that it is more probable for charge to move from a region with high charge carrier
density to one with lower density. This gives rise to the notion of th
Physics 120  David Kleinfeld  Spring 2017
1
1.1
Notes on Laplace circuit analysis
Background
We previously learned that we can transform from the time domain to the frequency domain under
steadystate conditions and thus solve algebraically for the tran
Midterm exam (closed book) for Physics 120A  9 May 2013
There are five problems (3 points each before curve). There is also an extra credit problem!
Complete each problem on a separate page (or pages) in a blue exam booklet.
R1
1.
Vin(t)
+

R2
L2
Vout(t
Homework #4 Solutions: Op Amps
Kleinfeld Physics 120A Spring 2013
Problem 1. Noninverting Ampli er with TNetwork for Smaller Feedback Resistors
What is Vout with respect to Vin ?
The objective is to solve for Vout and thus the closedloop gain (Vout Vin
The two opamp circuits drawn below are variable current sources, one with a pchannel FET and
the other with a pnp transistor (with a finite value of ). For each case, write an expression for the
current into the load, denoted ILoad, in terms of the resi
Physics 120A  Homework # 8
Due on 7 June 2013
#1) Show that the period of oscillation of an ICM7555 timer
IC is T loge(2) x (Ra + 2 x Rb) x C, and that the period is,
within reasonable limits, independent of the supply voltage.
#2) Design a Schmitt trigg