SincroSauro

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

• http://www.oe1ira.at/sl/mix.html
• http://www.phonestack.com/farhan/mixermusings.pdf
• http://g4oep.atspace.com/mixers/notes_on_the_basic_operation_of_.htm

occhio al bias!

• http://www.m0rjd.co.uk/bus-switches.html
• http://www.spinelectronics.eu/ftp/SDR/IK1ODO_SDR1.html

Topologie

QSD

• http://www.waves.utoronto.ca/prof/svhum/ece422/sdr/qsd.html
• http://kc.flexradio.com/KnowledgebaseArticle50193.aspx SDR1000
• http://martein.home.xs4all.nl/pa3ake/hmode/IF_detector_qsd.html
• http://www.itsrainingelephants.com/blog-archives/tag/adg704/
• http://www.m0nka.co.uk/wp-content/uploads/2016/03/rx_mixer.pdf
• http://www.m0rzf.co.uk/resources/QSD.pdf

H-mode

ma uscire in audio da un trasformatore e' grigia

• http://g4oep.atspace.com/mixers/notes_on_the_basic_operation_of_.htm#The%20QRSS%20Mixer. questo ha l'uscita audio
• http://martein.home.xs4all.nl/pa3ake/hmode/fsav430.html ma l'fsav430 pare semiintrovabile
• http://www.qsl.net/g3oou/solidstatecircuits9.html con due SPDT
• magari in versione 2T
  • http://martein.home.xs4all.nl/pa3ake/hmode/2t-hmode.html
  • http://www.arifidenza.it/forum/topic.asp?TOPIC_ID=81490

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
   • RF bilanciata (a trasformatore)
   • un dual spst
   • OUT sbilanciato
   • simile a https://lz3nf.wordpress.com/2013/07/25/280/

Componenti

• http://www.ti.com/product/ts3a4751 0.9 Ohm Low-Voltage Single-Supply Quad SPST Analog Switch tON = 14 ns, tOFF = 9 ns
• http://www.ti.com/product/ts5a623157 Dual 10-Ohm SPDT Analog Switch With Undershoot/Overshoot Voltage Protection
• http://www.ti.com/product/ts5a23159 1-Ohm Dual SPDT Analog Switch 5 V/3.3 V 2-Channel 2:1 Multiplexer/Demultiplexer
• http://www.analog.com/en/switchesmultiplexers/analog-switches/adg711/products/product.html
• Quad 2:1 MUX
  • SN74CBT3257 4 poli 2 vie, 500Mhz, 4-5.5v, 4Ω
    • K3S
    • KX2 ne usa due in RX, ognuno RF in bilanciato, out bilanciato
    • KX3 ne usa due
  • SN74CB3Q3257 versione a 3.3v, 500Mhz, 4Ω, con pompa di carica (potenzialmente rumorosa)
  • SN74CBTLV3257 bw 200 mhz, 5Ω, senza pompe di carica
• Dual 1:4 MUX
  • SN74CBT3253 usato da LP-PAN2
  • FST3253 usato da softrock (uscita sbilanciata), qrplabs, JUMA-TRX2 (entrata bilanciata e uscita bilanciata) e KX2 (in TX) Esistono anche sn74cbt3253 5v, 200mhz, 5Ω e sn74cbtlv3253 3.3, 200mhz, 5Ω
  • http://www.ti.com/product/TS3A5017/description, 165mhz, 11Ω
  • FSAV331 usato in pa3ake IF_detector board e PI5V331 o QS4A210 in SDR-1000 (BAL-BAL)
• http://www.analog.com/en/switchesmultiplexers/multiplexers-muxes/adg704/products/product.html SP4T, 2.5 Ω, +1.8 V to +5.5 V

Diplexer

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

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

• http://www.qrp.pops.net/dip_sup.asp
• http://www.tuberadio.com/new.html
• http://www.vk6fh.com./vk6fh/DIPLEXER%201.htm
• http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/radcom/1991/04/page39/
• http://www.qsl.net/g3oou/mixerterminations.html
• http://www.seboldt.net/k0jd/r2pamp.txt

Filtri RF

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

• http://www.gqrp.com/technical2.htm
• http://martein.home.xs4all.nl/pa3ake/hmode/bpf_intro.html

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

• http://www.psemi.com/products/rf-switches
• diodi PIN: consumano molto, non sembrano esistere per 3.3v
• FET discreti:
  • http://www.n5ese.com/tr_switch.htm
  • ci sono pochi FET con Vgth < 3.3v che lavorino bene ad alta frequenza:
    • http://www.st.com/web/catalog/sense_power/FM100/CL824/SC1164/PF253858
• Bus/Analog Switch: hanno una Ron non indifferente, non reggono segnali molto forti, lavorano malino a 3.3v
  • http://www.m0rjd.co.uk/bus-switches.html
  • http://martein.home.xs4all.nl/pa3ake/hmode/IF_switches.html
  • https://w3jdr.wordpress.com/fst3253-bus-switch-as-an-rf-switch/
  • http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=slyb125
  • http://www.ti.com/product/ts3a4751 0.9-Ω LOW-VOLTAGE SINGLE-SUPPLY QUAD SPST ANALOG SWITCH
  • http://www.maximintegrated.com/datasheet/index.mvp/id/3351 MAX4734 0.8Ω, Low-Voltage, 4-Channel Analog Multiplexer
• Amp Buffer integrati
  • Una via (solo rx)
  • ABA32563 http://www.avagotech.com/pages/en/rf_ics_discretes/rf_ics/silicon_amplifiers_gain_blocks/aba-32563/ reperibili a poco, bevono 37ma

letture:

• http://www.skyworksinc.com/downloads/press_room/published_articles/MPD_062009.pdf
• http://www.skyworksinc.com/downloads/press_room/published_articles/MPD_052009.pdf
• http://www.m0rzf.co.uk/softrock7/

Amplificatore audio

Preamp e filtro LP

• bilanciato
  • http://www.ti.com/product/ths4532 Dual, Ultra low power 0.25mA, RRO, fully differential amplifier
• sbilanciato
  • LVM772 http://www.ti.com/product/lmv772
  • TL974 oppure ts974 low noise 4nV/√Hz - 2.7-10v
  • OPA365 http://www.ti.com/product/opa365 2.2V, 50MHz, Low-Noise, Single-Supply Rail-to-Rail Operational Amplifier
  • ADA4692-2 http://www.analog.com/en/all-operational-amplifiers-op-amps/operational-amplifiers-op-amps/ada4692-2/products/product.html Low Power, Wideband, Low Noise, Rail-to-Rail Output, Dual Op Amp

PA

• TPA2005D1 https://focus.ti.com/docs/prod/folders/print/tpa2005d1-q1.html
• LM4667 http://www.ti.com/product/lm4667
• SSM2305 http://www.analog.com/en/audiovideo-products/audio-amplifiers/ssm2305/products/product.html

PA RF

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

LDO

• http://www.st.com/content/st_com/en/products/power-management/linear-voltage-regulators/low-dropout-ldo-linear-regulators/ld2985.html 280 mV at 150 mA and 7 mV at 1 mA, inhibit function

Layout

Baseband

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

LO & Mix

• LO Ondeggiatore
• 90' squarer
• QSD/E

Frontend

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