SincroSauro: Difference between revisions

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* [http://www.ti.com/product/ts3a4751 ts3a4751] 0.9 Ohm Low-Voltage Single-Supply Quad SPST Analog Switch tON = 14 ns, tOFF = 9 ns
* [http://www.ti.com/product/ts3a4751 ts3a4751] 0.9 Ohm Low-Voltage Single-Supply Quad SPST Analog Switch tON = 14 ns, tOFF = 9 ns
* [http://www.ti.com/product/ts5a623157 ts5a623157] Dual 10-Ohm SPDT Analog Switch With Undershoot/Overshoot Voltage Protection
* [http://www.ti.com/product/ts5a23159 ts5a23159] 1-Ohm Dual SPDT Analog Switch 5 V/3.3 V 2-Channel 2:1 Multiplexer/Demultiplexer
* [https://www.ti.com/product/TS3A24159 TS3A24159] 0.3-Ω 2-channel SPDT bidirectional analog switch, 1.65-V to 3.6-V
* http://www.analog.com/en/switchesmultiplexers/analog-switches/adg711/products/product.html
* http://www.analog.com/en/switchesmultiplexers/analog-switches/adg711/products/product.html
* Quad 2:1 MUX
* Dual 2:1
** [http://www.ti.com/product/ts5a623157 ts5a623157] Dual 10-Ohm SPDT Analog Switch With Undershoot/Overshoot Voltage Protection
** [http://www.ti.com/product/ts5a23159 ts5a23159] 1-Ohm Dual SPDT Analog Switch 5 V/3.3 V 2-Channel 2:1 Multiplexer/Demultiplexer
** [https://www.ti.com/product/TS3A24159 TS3A24159] 0.3-Ω 2-channel SPDT bidirectional analog switch, 1.65-V to 3.6-V
* Quad 2:1
** [http://www.ti.com/product/SN74CBT3257 SN74CBT3257] 4 poli 2 vie, 500Mhz, 4-5.5v, 4Ω  
** [http://www.ti.com/product/SN74CBT3257 SN74CBT3257] 4 poli 2 vie, 500Mhz, 4-5.5v, 4Ω  
*** [https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740323%20K3s%20Schematic%20Files.pdf K3S]   
*** [https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740323%20K3s%20Schematic%20Files.pdf K3S]   
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** SN74CB3Q3257 versione a 3.3v, 500Mhz, 4Ω, con pompa di carica (potenzialmente rumorosa)
** SN74CB3Q3257 versione a 3.3v, 500Mhz, 4Ω, con pompa di carica (potenzialmente rumorosa)
** SN74CBTLV3257 bw 200 mhz, 5Ω, senza pompe di carica
** SN74CBTLV3257 bw 200 mhz, 5Ω, senza pompe di carica
* Dual 1:4 MUX
* Dual 1:4
** [http://www.ti.com/lit/pdf/scds018 SN74CBT3253] usato da [http://www.telepostinc.com/LP-PAN2-Manual.pdf LP-PAN2]
** [http://www.ti.com/lit/pdf/scds018 SN74CBT3253] usato da [http://www.telepostinc.com/LP-PAN2-Manual.pdf LP-PAN2]
** [http://www.onsemi.com/PowerSolutions/product.do?id=FST3253 FST3253] usato da [http://fivedash.com/resource/RXTXEnsembleSchematic.pdf softrock] (uscita sbilanciata), [http://qrp-labs.com/receiver qrplabs], [http://www.jumaradio.com/juma-trx2/ JUMA-TRX2] (entrata bilanciata e uscita bilanciata) e [https://ftp.elecraft.com/KX2/Manuals%20Downloads/E740324%20KX2%20Schematic%20Files%20RevA.pdf KX2] (in TX) Esistono anche [http://www.ti.com/product/sn74cbt3253 sn74cbt3253] 5v, 200mhz, 5Ω e [http://www.ti.com/product/sn74cbtlv3253 sn74cbtlv3253] 3.3, 200mhz, 5Ω
** [http://www.onsemi.com/PowerSolutions/product.do?id=FST3253 FST3253] usato da [http://fivedash.com/resource/RXTXEnsembleSchematic.pdf softrock] (uscita sbilanciata), [http://qrp-labs.com/receiver qrplabs], [http://www.jumaradio.com/juma-trx2/ JUMA-TRX2] (entrata bilanciata e uscita bilanciata) e [https://ftp.elecraft.com/KX2/Manuals%20Downloads/E740324%20KX2%20Schematic%20Files%20RevA.pdf KX2] (in TX) Esistono anche [http://www.ti.com/product/sn74cbt3253 sn74cbt3253] 5v, 200mhz, 5Ω e [http://www.ti.com/product/sn74cbtlv3253 sn74cbtlv3253] 3.3, 200mhz, 5Ω

Revision as of 18:31, 27 March 2019

un ricev(trasmett)itore HF cosi piccolo da poterlo custodire comodamente tra le fauci

  • piccolo
  • economico
  • a basso consumo (<100ma rx)
  • a bassa tensione (3.3v o 5v)

VFO

Basta un Ondeggiatore!

Quadratura

sn74lvc74a 1.65 V to 3.6 V, tpd of 5.2 ns at 3.3 V

Demodulatore

Basta un Laterizio!

Mixer

Gilbert-cell

Una cella di gilbert implementata con un array di bipolari: regge piu di un mosfet dual-gate e consuma meno di un ring di diodi

HFA3101 http://www.intersil.com/en/products/amplifiers-and-buffers/transistor-arrays/transistor-arrays---gilbert-cell-uhf/HFA3101.html

DGMOS

http://sm0vpo.com/blocks/mixers-1.htm

ma sembrano introvabili a 3.3

Commutativi

occhio al bias!

Topologie

QSD
H-mode

ma uscire in audio da un trasformatore e' grigia

Bilanciati
  1. http://home.snafu.de/graff/sbt40.pdf rf splittata a condensatori, LO split a porte logiche
  2. http://yu1lm.qrpradio.com/HF%20SDR%20RECEIVER%20CW-SSB-DRM%20YU1LM.pdf
    • RF sbilanciata
    • LO + !LO
    • OUT bilanciato
    • si puo reimplementare con un singolo SPDT
  3. http://www.qrp.pops.net/K7LR-Memorial.asp

Componenti

Diplexer

sul diplexer che segue il mixer si gioca buona parte della dinamica del ricevitore

http://www.qrp.pops.net/dip2.asp

Filtri RF

set di filtri passa banda LC commutabili (<5W)

Commutazione LP e PA

i sistemi di commutazione praticabili sono:

meccanico

  • commutatore meccanico: problemi di cablaggio e di contatti
  • microrelays DIP: consumano abbastanza e hanno problemi di contatto (a meno di non implementare il 'DC wetting', non sembrano esistere per 3.3v

stato solido

letture:

Amplificatore audio

Preamp e filtro LP

PA

PA RF

  • RD06HVF1
  • RD02LUS2 470MHz,2W
  • PD54008 8 W with 11.5dB gain @ 500 MHz/7.5 V

LDO

Layout

Baseband

  • mic preamp & lowpass
  • lowpass & audio pa
  • Laterizio

LO & Mix

Frontend

  • PA RF
  • band filter
  • RX attenuator
  • T/R switch