Transcript (VCO) para frecuencias de microondas las bandas ISM

Undergrad thesis project:
Diseño, construcción y
caracterización de un oscilador
controlado por voltaje (VCO) para
frecuencias de microondas las bandas
ISM
HECTOR MAURICIO PORRAS
WILCHES
260304
September 19 2008
GENERAL OBJECTIVE

Design, build and characterize two oscillators
controlled by voltage (VCO), in the ISM band.
They will cover the frequencies at least from
857 to 928 MHz and 2.26 to 2.4835 GHz
SPECIFIC OBJECTIVES




Build two prototypes of each design.
Characterize and model the transistor that is
used for the construction of the oscillators.
Study the different options for the resonant
load and choose the most appropriate.
Study the different options for tuning the
oscillator and choose the most appropriate.
1. DEFINITION

An electronic oscillator is a electronic device
that converts DC power in AC power

A VCO is an oscillator whose central
frequency is controlled by a voltage. [1]
2. SPECIFICATIONS


Output power
Frequency
–
–
–
–
–



Accuracy
Thermal changes
Pushing
Pulling
Phase Noise [3]
Bandwidth
Modulation sensitivity
Tuning speed [2]
2.1 AN EXAMPLE [7]
3. OSCILLATOR THEORY



Feedback oscillator
One-Port negative resistance oscillators
Two-Port negative resistance oscillators [4]
4. RESONATORS

Review series RLC and parallel RLC
concepts
–
–
–
–
Zin
Unloaded Q
Loaded Q
BW
4. RESONATORS

Types:
–
–
Lumped LC elements
Transmission line


–
–
Short-circuited  / 2 lines
Open-circuited  / 4lines
SAW
Rectangular and circular waveguide cavities [5 y
6]
4. ACTIVE DEVICES





BJT
MOSFET
JFETS
MESFETS
DIODOS
5. TUNNING TECHNIQUES

Electronic
–

Varactor
Mechanical
–
Screws
6. TOPOLOGIES



Colpitts
Hartley
Clapp
6. REFERENCES
1.
2.
3.
4.
5.
6.
7.
U. L. Rohde, “RF/Microwave circuit design for Wíreles applications”,
1st ed, Ed John Wiley & Sons, Inc, New York, 2000, pp. 719.
M. Golio, “The RF and microwave handbook”, 1st ed, Ed CRC
Press, Boca Raton, 2001, pp 612-625.
Jhon Silver. PhaseNoise.pdf. Disponible en
http://www.zen118213.zen.co.uk/Systems_And_Devices_Page.htm
G. Gonzalez, “Microwave transistors amplifiers analysis and
design”, Ed Prentice Hall, New Jersey, 1984, pp. 194-200.
D. M Pozar, “Microwave Engineering”, 2nd ed, Ed. John Wiley &
Sons, Inc, New York, 1998, pp. 300-328.
R. W. Rhea, “Oscillator design and computer simulation”, 2nd ed,
Ed Noble Publishing Corporation, Atlanta, 1995, pp. 49-62
Crystek Corporation. CVCO55CW Data Sheet. CVCO55CW-01000200.pdf