Instrumentação e Medidas

Transcrição

Osciloscópio
© Jorge Guilherme 2008
#287
Osciloscópio
Medição de período e fase
#288
1
Osciloscópios analógicos e digitais
analógico
#289
Controlos do osciloscópio
#290
2
Figuras de lissajous
Desfasamento entre as duas ondas
 A

 B
φ = arcsin
#291
Medição de pulsos
#292
3
Largura de banda do osciloscópio
Para evitar distorção em AC
Vin
DC
Cc
BW =
AC
Ri
PW <
0.35
tri
tri – tempo de subida
do osciloscópio
Ri .Cc
10
#293
Largura de banda do osciloscopio
BW =
0.35
tri
tri – tempo de subida
do osciloscópio
#294
4
Base de tempo
Vc
Vcc
Vr
Multiplexagem
t
1mA
Cb
canal A
Vc
Cx
Rb
circuito vertical
canal B
chopper
Sync
#295
Multiplexagem alternada
Multiplexagem chopper
#296
5
Pontas de prova
Ponta + cabo
C1
Osciloscopio
Rs
R1
Cc
Ri
Ci
Vi
Compensação da ponta
R1.C 1 = Ri (Ci + Cc )
Ri
(Cc + Ci )
C1 =
R1
Rin = R1 + Ri
C 1(Cc + Ci )
Cin =
C 1 + Cc + Ci
#297
Compensação da ponta de prova
Tempo de subida devido à capacidade de entrada
tro = 2.2 RsCin
Tempo de subida do traço
trd = tri 2 + tro 2
#298
6
#299
Fring =
1
2π Lparasita.Cin
#300
7
Família lógica
Tr (ns)
BW (MHZ)
Capacidade de entrada
da ponta (pF)
CDMOS
1.5
230
5
Advanced CMOS
0.8
440
3
ECL
0.5
700
3
ECL ipse
0.3
1170
1.4
GaAs
0.1
3500
1.5
cabo 50 ohm
Ponta FET
Max – BW – 1GHz
50
Ponta resistiva
450
cabo 50 ohm
Maior largura de banda
Max – BW – 10GHz
50
#301
Diferentes tipos de pontas
Alta tensão
Sonda de corrente
#302
8
Acessórios
Injecção de ruído pela massa
#303
#304
9
Osciloscópio digital
Equivalent time sampling
Real time sampling
#305
•How do they work?
bandwidth
Sample rate
Memory depth
#306
10
Técnicas de amostragem
#307
Alguns tipos de medidas
#308
11
#309
Analog Bandwidth
What does a 50MHz square
wave really look like?
60MHz
Scope
100MHz
Scope
350MHz
Scope
500MHz Scope
#310
12
Visualização do espectro com analise FFT
#311
Analisador de Espectros
#312
13
Time
Voltage
Voltage
Sources Generate Sine Waves
Oscilloscope
Frequency
Spectrum Analyzer
This is the ideal output: most specs deal with deviations from the
ideal and adding modulation to a sine wave
Millimeter
Microwave
RF
3-6 GHz
20-50 GHz
300 GHz
#313
Analisador de espectros
#314
14
#315
#316
15
#317
#318
16
Analisador Logico
#319
Sinal digital
Permite ver muitos sinais logicos em
simultâneo
#320
17
#321
Aquisição de sinais
#322
18
#323
Analisador de Redes
#324
19
Network Analyzer Basics
#325
Network Analysis is NOT.…
Router
Bridge
Repeater
Hub
Your IEEE 802.3 X.25 ISDN
switched-packet data stream
is running at 147 MBPS with
-9
a BER of 1.523 X 10 . . .
#326
20
High
What Types of Devices are Tested?
Integration
Duplexers
Diplexers
Filters
Couplers
Bridges
Splitters, dividers
Combiners
Isolators
Circulators
Attenuators
Adapters
Opens, shorts, loads
Delay lines
Cables
Transmission lines
Waveguide
Resonators
Low
Dielectrics
R, L, C's
RFICs
MMICs
T/R modules
Transceivers
Receivers
Tuners
Converters
VCAs
Amplifiers
Antennas
Switches
Multiplexers
Mixers
Samplers
Multipliers
Diodes
Device type
Passive
VCOs
VTFs
Oscillators
Modulators
VCAtten’s
Transistors
Active
#327
Lightwave Analogy to RF Energy
Incident
Reflected
Transmitted
Lightwave
DUT
RF
#328
21
.
What is the Difference Between
Network and Spectrum Analyzers?
Measures
known
signal
Amplitude
Amplitude Ratio
8563A
Frequency
Spectrum analyzers:
Network analyzers:
9 kHz - 26.5
Measures
unknown
signals
Frequency
SPECTRUM ANALY ZER
GHz
measure components, devices,
circuits, sub-assemblies
contain source and receiver
display ratioed amplitude and
phase
(frequency or power sweeps)
offer advanced error correction
measure signal amplitude characteristics
carrier level, sidebands, harmonics...)
can demodulate (& measure) complex signals
are receivers only (single channel)
can be used for scalar component test (no
phase) with tracking gen. or ext. source(s)
#329
Generalized Network Analyzer
Block Diagram
Incident
Transmitted
DUT
SOURCE
Reflected
SIGNAL
SEPARATION
INCIDENT
(R)
REFLECTED
(A)
TRANSMITTED
(B)
RECEIVER / DETECTOR
PROCESSOR / DISPLAY
#330
22
Source
Supplies stimulus for system
Swept frequency or power
Traditionally NAs used separate
source
Most Agilent analyzers sold
today have integrated,
synthesized sources
#331
Incident
Signal Separation
Transmitted
DUT
Reflected
SOURCE
SIGNAL
SEPARATION
INCIDENT (R)
REFLECTED
(A)
TRANSMITTED
(B)
RECEIVER / DETECTOR
PROCESSOR / DISPLAY
•
•
measure incident signal for reference
separate incident and reflected signals
splitter
bridge
directional
coupler
Detector
Test Port
#332
23
High-Power Amplifiers
Preamp
8753ES
Source
Ref In
Preamp
AUT
DUT
R
A
B
AUT
+43 dBm max input (20 watts!)
8720ES Option 085
85118A High-Power
Amplifier Test System
#333
24

Instrumentação e Medidas

Transcrição

Documentos relacionados

Universidade Federal do Rio de Janeiro Escola Politécnica

Ficha de Unidade Curricular

duarteneves.pt

II – INSTRUMENTAÇÃO INDUSTRIAL Prof. Eduardo Calsan

Múmia de Sha-amun-em-su estudada pela equipe do Seshat

Oração a São Jorge Ó São Jorge, meu guerreiro

catálogo produtos instrument

ORAÇÃO A SÃO JORGE - Ervanária Flôr do Dão, Lda

Dia 10, Sexta-feira (tarde) - Blog de la Bibliodiversidad

Beatris e Guilherme Braga Pires celebram Bodas de Ouro