ECE145a/218Ca notes, M. Rodwell, copyrighted 2009
ECE 145a / 218 a, notes set 4:
Impedance Matching
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
ECE145a/218Ca notes, M. Rodwell, copyrighted 2009
ECE 145A/218A, Lab Project #1b: Transistor Measurement.
October 6, 2014.
OVERVIEW . 2
1
Overview
The goal of this exercise is to familiarize yourself with impedance-matching.
This should be a short and easy lab project.
The assignment
Start by constructin
ECE ECE145A (undergrad) and ECE218A (graduate)
Mid-Term Exam. February 11, 2009
Do not open exam until instructed to.
Open notes, open books, etc
You have 1 hr and 15 minutes.
Use any and all reasonable approximations (5% accuracy is ne. ) ,AF T ER STA TI
Mask Layout Design Guide
For ECE218C, UCSB Drafted by Le Wang and Shalini Lal (10/04/2008)
After the design of an integrated circuit, we need to layout all the active, passive components and interconnection wires and generate GDSII bit file in some comput
ECE145a/218a: Exercise in Running the Simulation Tools and Introductory Circuits The exercises below are designed to *complement* your running the ADS tutorials (in ADS documentation), which are highly recommended.
FIRST: MECHANICS OF ACCESSING THE PROGRA
SIMULATIONS: PROBLEM 5
Problem 2
For this problem, very low capacitance of 0.001fF was used to avoid invalid dB values for the S-parameters during
simulation. As mentioned in the email, this was for SIMULATION ONLY. S (2, 1) nearly remains the same and S
1
2
3
4
5
6
Problem 1
Problem 2
7
8
9
10
Problem 3
11
12
13
14
Problem 5
Magnitude plot has been chosen for S(1,2) and S(2,2) since Log(0) is invalid and conveys no information on the plot.
15
16
17
18
Problem 7
ECE145a / 218A lab project #3
Reactively Tuned Amplifier .
Mark Rodwell, Nov 10, 2014.
Assignment
Your assignment is to design and construct a reactively tuned amplifier. The transistor
is to be an Avago AT-42035 Bipolar Transistor. The goal is to obtain
ECE145A /218CA notes, M. Rodwell, copyrighted
ECE145a / 218a: Notes Set 5
device models &
device characteristics:
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
Content:
Bipolar Transistor M odels
class notes, M. Rodwell, copyrighted 2009
ECE145a / 218a
Bilateral Tuned Amplifier Design
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
Stability
class notes, M. Rodwell, copyrighted 2009
Uncondit
class notes, M. Rodwell, copyrighted 2009-14
ECE 145A / 218 C, notes set 2:
Transmission Line Parasitics
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
class notes, M. Rodwell, copyrighted 2009-14
class notes, M. Rodwell, copyrighted 2009
ECE 145A / 218 C, notes set 1:
Transmission Line
Properties and Analysis
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
class notes, M. Rodwell, copyrighte
class notes, M. Rodwell, copyrighted 2009
ECE145a / 218a
Bilateral Tuned Amplifier Design: Stability
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
Stability
Instability : non - zero output wit zer
class notes, M. Rodwell, copyrighted 2009-14
ECE 145A / 218 C, notes set 3:
Two-Port Parameters
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
Device Descriptions for Circuit Design
class notes, M.
class notes, M. Rodwell, copyrighted 2009
ECE145a / 218a
Power Gain Definitions
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
class notes, M. Rodwell, copyrighted 2009
Power Gain Definitions: Summ
Problem 1(a)
B1 is always positive and K>1 beyond 68GHz. This suggests that the circuit is potentially unstable below 68 GHz and
unconditionally stable above 68 GHz.
At 20 GHz, the circuit is potentially unstable as K<1. So MAG is not defined at 20 GHz. W
Problem # 1
Please simulate S (1, 1) plot on a Smith chart, and from the frequencies at which the line is multiples of a quarterwavelength, and determine the line Zo.
a) Simulation Circuit
b) S(1,1) plot on a Smith chart
c) Verification of value of Zline
Problem 5:
Case (a)
Case (b)
Comments: As expected, the inductor behaves like a short for DC and the impedance increases with
increase in frequency becoming a nearly open circuit element at high frequencies. The S(1,1) plot for a
lumped inductor element i
Final Problem Set: PA and LNA Design
Mark Rodwell, Dec. 2, 2014
In this design exercise, I will first lead you through a design exercise at 94GHz, and
then ask you to repeat the design at 60GHz.
POWER AMPLIFIER DESIGN . 2
TRANSISTOR MODEL . 2
BIASED POWER
ECE 145a /218A problem set:
Bilateral Reactively matched ampliers and stability.
Problem 1:
g m 1.0mS / m Wg
Ri 1.0 / g m
C gd 0.2 fF / m Wg
C gs 1.0 fF / m Wg
Gds 0.1mS / m Wg
part a) Taking Wg =100 microns for the bilateral device model, Plot the MAG/MS
ECE - 218A/145A - Fall 2012
PS #4 - Solutions
1
Problem
a)
(a) Smith Chart S11
(b) Simulation Circuit
Figure 1: First Case
From the Smith chart in Fig.1a, it is seen that the quarter wavelength frequency is 105 GHz. The corresponding impedance at 105 GHz,
Problem 5
Simulation of Problem 2
Observe the 3-dB frequency at 89.5 GHz, which is exactly our hand calculation value. This shows the
agreement of MOTC value with simulation. This is exact as it was a very simple circuit. There might be a
deviation for mo
Problem 1
Plot of Y - parameters vs Frequency ( GHz)
Only few of the plots will be plotted for following problems. If
you are concerned about the plots, please contact the TA.
Problem 3
S - parameters
Note : Observe the typical 3dB roll-off from the bode
Problem 5
S11 for Short-circuit transmission line
S11 for inductor L = 100 pH
Problem 6
S11 for Open circuit transmission line
S11 for a capacitor C = 10 fF
S11 (in) parameter is synonymous with Zin as they are related as
S11 = (Zin - Z0 )/ (Zin + Z0 )
Pr
#6
1)
Problem 1a
On the left is the plot of
Stability Factor(K) and
Stability Measure (B) against
frequency. B > 0 for all the
frequencies of interest. But,
we see that K < 1 for
frequencies less than 96
GHz. This suggests that the
circuit is potentially
ECE 145a /218A problem set : Unilateral reactively matched ampliers, signal flow
graphs.
Background: Unilateral Device model.
We will assume a highly simplified
device model as to the right, with
g m 1.0mS / m Wg Ri 1.0 / g m
C gd 0 fF
Cgs 1.0 fF / m Wg
G
ECE 145a /218A problem set:
Bilateral Reactively matched ampliers and stability.
Problem 1:
g m 1.0mS / m Wg
Ri 1.0 / g m
C gd 0.2 fF / m Wg
Cgs 1.5 fF / m Wg
Gds 0.1mS / m Wg
part a) Taking Wg =100 microns for the bilateral device model, Plot the MAG/MSG
class notes, M. Rodwell, copyrighted 2009
ECE145a / 218a
Bilateral Tuned Amplifier Design
Mark Rodwell
University of California, Santa Barbara
rodwell@ece.ucsb.edu 805-893-3244, 805-893-3262 fax
Stability
class notes, M. Rodwell, copyrighted 2009
Uncondit
ECE 145a /218A problem set 6a
Power amplifiers
Problem 1:
The FET has a small-signal parameters
as below, and large-signal parameters as
given to the right.
g m 1.0mS / m Wg Ri 1.0 / g m
Cgd 0.0 fF / m Wg
Cgs 1.5 fF / m Wg
Gds 0.1mS / m Wg
The maximum saf
ECE 145a /218A problem set (device models, 2 port parameters, impedance
matching). Note: please download the ADS directory ADS_for_218a, unarchive this in
ADS, and use this for the simulation portion of the assignment.
Problem 1: Shown is a highly
simplif