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:

  • analog filter;

  • analog-to-digital converter;

  • digital downconverter;

  • demodulator;

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.

  • What's up with down converters

  • Digital Down Converter (2010)

    Device input bits sample rate

    (MSPS)

    channel decimation range SNR

    (dB)

    supply voltage

    (V)

    power

    (mW)

    produttore  
    TEXAS INSTRUMENTS (GRAYCHIP)
                       
    ANALOG DEVICES
    AD6655 16 67 1 1-16352   3.3   ANALOG  
                       
                       
    MAXIM
                       
                       
    NATIONAL SEMICONDUCTOR
                       
                       
                       
    INTERSIL
                       
                       

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            
                   

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