Maker Pro
Maker Pro

circuit for DSSC amplitude modulated wave.

A

abhilsah j

Jan 1, 1970
0
hello,
i have been trying to get a circuit for DSSC de-modulator. would u
please sent one to me. also would anyone of u please sent me a circuit
for a single side band suppressed carrier modulator that uses crystal
filter to cutoff one of its side bands. i am actually experimenting
with my simulator but i dont have the required circuit. Thank you.

from abhilash J
 
F

Frank Raffaeli

Jan 1, 1970
0
hello,
i have been trying to get a circuit for DSSC de-modulator. would u
please sent one to me. also would anyone of u please sent me a circuit
for a single side band suppressed carrier modulator that uses crystal
filter to cutoff one of its side bands.

A double-sideband suppressed carrier demodulator is usually
implemented by multiplying the signal by itself, followed by a
low-pass filter. You will need to determine if you need certain types
of carrier re-insertion depending upon the application.

For the modulator, you will need to be more specific: Baseband signal
bandwidth and group delay, carrier frequency, etc ....
i am actually experimenting
with my simulator but i dont have the required circuit. Thank you.

from abhilash J

May I borrow this line? I could have used it in a few tight spots ;-)

Frank Raffaeli
http://www.aomwireless.com/
 
J

Jim Thompson

Jan 1, 1970
0
A double-sideband suppressed carrier demodulator is usually
implemented by multiplying the signal by itself, followed by a
low-pass filter. You will need to determine if you need certain types
of carrier re-insertion depending upon the application.

For the modulator, you will need to be more specific: Baseband signal
bandwidth and group delay, carrier frequency, etc ....

A DSSC signal is what you get from a Gilbert cell multiplier
(inserting carrier to the upper rank of transistors, the modulation to
the lower rank). Takes no filtering.

Now if you want SSSC, you need I and Q versions of both carrier AND
modulation (the tricky part), two Gilbert cells, and sum (or
difference) the result.

...Jim Thompson
 
Top