Spatia Devinco Radiantur
...d'accordo la sigla SDR sta per : Software Defined Radio
ma oggi preferisco interpretarla con una parte del motto latino: spatia devinco disiuncta coniunco
che è quello del Genio Trasmissioni dell'Esercito Italiano
(nel lontano 1981 feci il corso Allievi Ufficiali di Complemento, corso 105)
A software-defined radio is a receveing
system where the signal is converted in digital and the
processing is software.
a digital conversion close to the
antenna.
wideband ,multiband and multirate;
the reconfigurability by
software;
The software-defined receiver includes:
The receiver architecture is based ADC
characteristics (dynamic range, frequency clock jitter)
A digital downconverter is a numerically
controlled oscillator (NCO) followed by filter
implemented as a field programmable gate array (FPGA) or
with a receive signal processor
a digital signal processor perform the
demodulation.
Useful link on this argument:
site Analog
Devices.
NEWS
new ADC http://www.linear.com/pc/productDetail.do?navId=H0,C3,P7852
A second-generation 14-bit 80Msps ADC in Linear
Technology^s recently announced LTC2220 family
achieves extremely low power consumption with
excellent AC performance. At just 230mW, in a 5mm
x 5mm QFN package, the LTC2249 is only half the
power of its nearest competitor at this speed,
has the smallest package and board size, yet
achieves over 73dB SNR up to 100MHz input -
better than even higher-powered competitors. The
LTC2249 is one of 13 new ADCs introduced today by
Linear Technology, as part of its expanding
family of low power, high speed ADCs, which range
from 10Msps to 170Msps at 12-bit and 10-bit
resolution, as well as 14-bit converters up to
80Msps.
INTERSIL : recent release of
ISL5416 a wideband four-channel DDC
Digital
Down Converter (2010) |
| Device |
input bits |
sample rate
(MSPS) |
channel |
decimation range |
SNR
(dB) |
supply voltage
(V) |
power
(mW) |
package |
price |
| TEXAS
INSTRUMENTS (GRAYCHIP) |
| |
|
|
|
|
|
|
|
|
|
| ANALOG
DEVICES |
| AD6655 |
16 |
67 |
1 |
1-16352 |
|
3.3 |
|
ANALOG |
|
| NXP |
|
|
|
|
|
|
|
NXP |
|
| |
|
|
|
|
|
|
|
|
|
| MAXIM |
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| NATIONAL
SEMICONDUCTOR |
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| INTERSIL |
| |
|
|
|
|
|
|
|
|
|
| NXP |
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
Digital
Down Converter (2004)
|
| Device |
input bits |
sample rate (MSPS)
|
channel |
decimation range |
SNR (dB)
|
supply voltage (V)
|
power (mW)
|
package |
price |
| TEXAS
INSTRUMENTS (GRAYCHIP) |
| GC4016 |
14 |
62 |
4 |
82 |
70 |
3.3 |
|
LQFP-64 |
|
| GC5016 |
|
62 |
|
|
72 |
5 |
|
LQFP-64 |
$29 |
| |
|
|
|
|
|
|
|
|
|
| ANALOG
DEVICES |
| AD6620 |
16 |
67 |
1 |
1-16352 |
|
3.3 |
|
PQFP-80 |
|
| AD6624 |
14 |
|
4 |
|
|
|
|
|
|
| AD5534 |
|
|
|
|
|
|
|
|
|
| MAXIM |
| |
10 |
40 |
|
|
|
3.3V |
|
|
|
| |
|
|
|
|
|
|
|
|
|
| NATIONAL
SEMICONDUCTOR |
| CLC59027 |
12 |
70 |
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| INTERSIL |
| ISL5416 |
|
|
4 |
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
-
|
