Digital receivers
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Digital receivers

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basic concept of digital receivers and tuning architecture

basic concept of digital receivers and tuning architecture

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    Digital receivers Digital receivers Presentation Transcript

    • Digital receivers Sagax Communications, Ltd. Haller u. 11-13. Budapest 1096 Hungary www.sagax.hu
    • A Frequency response of the ADC input stage Fs = 80MHz 1st Nyquist zone 2nd Nyquist zone 40 3rd Nyquist zone 80 4th Nyquist zone 120 5th Nyquist zone 160 6th Nyquist zone 200 Instantaneous bandwidth =<Fs/2 7th Nyquist zone 240 8th Nyquist zone 280 9th Nyquist zone 320 10th Nyquist zone 360 Input bandwidth = 300MHz F [MHz] 400
    • MUL FLT DEC I samples FLT DEC Q samples SIN Input samples Splitter NCO COS MUL
    • RF Front-end SDR-based Digital Receiver Receiver platform computer 20-3000MHz VHF/UHF A FIFO D LF/HF DDC FPGA DSP GUI Converter card 6KHz-32MHz LAN Control LINE SERIAL Audio, Data, Remote Audio GPS, Compass
    • RF Pre-selector (optional) LIMITER HPF 1.6MHz RF ATT 0/10/20/30dB LPF 32MHz RF LNA A Filtered input Direct input B A Input selector 1st Nyquist zone 2nd Nyquist zone 40 3rd Nyquist zone 80 4th Nyquist zone 120 5th Nyquist zone 160 6th Nyquist zone 200 7th Nyquist zone 240 8th Nyquist zone 280 9th Nyquist zone 320 10th Nyquist zone 360 400
    • RF Pre-selector (optional) LIMITER HPF 88MHz LPF 110MHz RF ATT 0/10/20/30dB RF LNA A Filtered input Direct input B A Input selector 1st Nyquist zone 2nd Nyquist zone 40 3rd Nyquist zone 80 4th Nyquist zone 120 5th Nyquist zone 160 6th Nyquist zone 200 7th Nyquist zone 240 8th Nyquist zone 280 9th Nyquist zone 320 10th Nyquist zone 360 400
    • RF Pre-selector (optional) LPF 3000MHz RF ATT 0/10/20/30dB RF LNA LO1 3400-6400MHz C BPF 3400MHz IF ATT 0/10/20/30dB LO3 930MHz 10MHz Ext. Ref. D 10MHz Ext. Ref. IF AMP IF AMP BPF 860MHz LO2 2540MHz BPF 60MHz (21.4MHz, 140MHz optional) 10MHz Ext. Ref.
    • 1 2 3 A B
    • 1 2 3 4 A B
    • A B C D
    • D C C D
    • E F G C D
    • H C I D J
    • Frequency display on SRM
    • Frequency display on SRS
    • Frequency display on SRS in wb search mode
    • Spectrum display on SRS without (1) display decimation
    • Spectrum display on SRS with 2 display decimation
    • Spectrum display on SRS with 4 display decimation