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RIS 2010
DDS VF izvor
Matjaž Vidmar, S53MV
FE, Ljubljana, 16.01.2010
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+AKUMULATOR(D-LATCH)N-BITOV
TABELASIN(X)
FREKVENCA
SEŠTEVALNIK
KRISTALNIOSCILATORZA TAKT
D/A
NIZKO-PREPUSTNO
SITO
ANALOGNI
IZHOD
M-BITOVN-BITOV
f = K
2N⋅ f osc
K f osc
IZHODNAFREKVENCA
S / I =M⋅6dBIZHODNORAZMERJE
SIGNAL/MOTNJA(S/I) [dB]
DirectDigitalSynthesizer
f
S / I
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f
f osc 2 f osc 3 f osc
JAKOST [dB]
40MHz
PRESLUH TAKTA 200MHz
OVOJNICASIN(X)/X
NIZKO-PREPUSTNO
SITO
160MHz
240MHz
440MHz
360MHz
560MHz
PRESLUH TAKTA 400MHz
PRESLUH TAKTA 600MHz
OSNOVNI SIGNAL
f osc=200MHz
FREKVENČNI SPEKTERDDS IZVORA PRI
MOTNJA
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LCD HD44780 2 X 16 ZNAKOV
LPC 2138ARM
MIKRO-KONTROLER
VZPOREDNI VMESNIK
VZPOREDNI VMESNIK
SPI1
DAC
U
D
RL
4 TIPKE
AD 985132bit/200MHz
DDS
KRISTALNIOSCILATOR33.333MHz
VF IZHOD
~220mV (+0dBm)do
~71nV (-130dBm)
SLABILEC0..130dB
LP2591
RESET
7805
(TO-220)
+3.3V
RESET
NAPAJANJE+12V
250mA
LM358
+5V
DAC BIAS
NOSILEC
FM
AM
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