circuit for DSSC amplitude modulated wave.

[abhilsah j]

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

 

[Frank Raffaeli]

meetabhilashj@rediffmail.com (abhilsah j) wrote in message news:<3a61b9cb.0405070211.4b399755@posting.google.com>...

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/

 

[Jim Thompson]

On 7 May 2004 08:03:45 -0700, SNIPrf_man_frTHIS@yahoo.com (Frank
Raffaeli) wrote:

meetabhilashj@rediffmail.com (abhilsah j) wrote in message news:<3a61b9cb.0405070211.4b399755@posting.google.com>...
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

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
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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