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EEE C364/INSTR C 364
Analog Electronics
Lecture 12
11-02-2012
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5. Amplitude Modulation
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5. Amplitude Modulation
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Circuit for AM implementation
tcosEt)cosmE(1V
tcosEVngSubstituti
tcos)EmV(1
tcosEtcosEVThus
mK)V(1VAlsotcosEtcosEmVmK)V(1
tcosE-VtcosEV
ccmm0
mmm
ccm
cccc0
x0
cccmx
cxccm
m
c
cx
mV
mKVK
Writing KCL equation at Node A we get
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Circuit for AM Demodulation
)t(2cosEE0.5tcosEE0.5(t)V(t)VThen
signaloscillatorlocal-cos(t)Vcomponentsidebandupper)cos((t)SupposeV
mcy0my0y0
y
00
tEtE
cy
mc
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ANALOG SWITCH
Electronic switches whose state is voltage-programmable
Applications:
D-A converters
Function generators
S/H amplifiers
Switching power supplies
(a) Ideal switch and (b) its characteristics
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IDEAL SWITCH
ANALOG SWITCH
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IDEAL SWITCH
ANALOG SWITCH
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CMOS transmission gate and its resistance as a function of Vi
CMOS transmission gate
Examples: CD4066 quad bilateral switch
CD4051 eight channel multiplexer/demultiplexer
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MOSFET SWITCH
ANALOG SWITCH
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OTHER SWITCH CONFIGURATIONS
ANALOG SWITCH
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SWITCH ARRANGEMENT
ANALOG SWITCH
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APPLICATIONS OF ANALOG SWITCH
ANALOG SWITCH
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APPLICATIONS OF ANALOG SWITCH
ANALOG SWITCH
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Performance Characteristics of Analog Switches
Vs, analog signal range
Ron, on Resistance
VAI,VAH, input thresholds
IA, input leakage current
TA, Ton, Toff, access time
Topen, break-before-make delay
CS(off),CD(off), CD(on), CDS(off),CA
OFF Isolation
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SPST ANALOG SWITCH IC (MAX325)
ANALOG SWITCH
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SPST ANALOG SWITCH IC (MAX325)
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BASIC CIRCUIT
SAMPLE-AND-HOLD CIRCUITS
RC
tVtV Ad exp1)(
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BASIC CIRCUIT
SAMPLE-AND-HOLD CIRCUITS
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PERFORMANCE CHARACTERISTICS
SAMPLE-AND-HOLD CIRCUITS
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ANALOG MULTIPLEXING
ANALOG MULTIPLEXERS
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A TWO-CHANNEL ANALOG MULTIPLEXER
ANALOG MULTIPLEXERS
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Differential Four Channel
Analog Multiplexer
Inhibit Digital
Input A
Digital
Input B
Values at
the output
0 0 0 0X, 0Y0 0 1 1X, 1Y
0 1 0 2X, 2Y
0 1 1 3X, 3Y
1 X X None
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Differential Four Channel Analog Multiplexer
Wide range of digital and analog signal levels
- Digital 3-20V
- Analog
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