4. Digital-to-analog conversion is the process of
changing one of the characteristics
signal based on the information in
of an
digital
analog
data.
DIGITAL-TO-ANALOG CONVERSION
5. Phase Shift Keying (PSK)
When a new binary symbol is
encountered, the phase of the signal
is altered.
frequencies, f1
uses two
and f2.
Frequency Shift Keying (FSK)
This technique
is held;
otherwise it is set to 0.
Amplitude Shift Keying(ASK)
When binary data represents digit
1, the amplitude
TYPES OF DIGITAL-
TO-ANALOG
There are FOUR types of modulation
Frequency Shift Keying (FSK)
This technique uses two frequencies,
f1 and f2.
6. •
• BANDWIDTH FOR ASK:
BASK OR OOK (ON-OFF KEYING)
B = (1 + D) × S
MODULATION OF DIGITAL DATA: ASK
8. • BANDWIDTH : THE
• LESS THAN THAT
SAME AS BASK, B = (1 + D) X S
FOR BFSK
MODULATION OF DIGITAL DATA: PSK
9. MODULATION OF
DIGITAL DATA: QAM
AMPLITUDE MODULATION
• QUADRATURE
• COMBINATION
• BANDWIDTH :
OF ASK AND
THE SAME AS
PSK
THAT REQUIRED FOR ASK
AND PSK
11. Amplitude Modulation
AM is normally implemented
by using a simple
multiplier
Frequency Modulation
FM is normally implemented by
using a voltage-controlled
oscillator
Phase Modulation
Phase modulation is
practically similar to
Frequency Modulation
ANALOG-TO-ANALOG
