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** 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 mux | ||
** [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] e [http://www.jumaradio.com/juma-trx2/ JUMA-TRX2] (entrata bilanciata e uscita bilanciata) | ** [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] e [http://www.jumaradio.com/juma-trx2/ JUMA-TRX2] (entrata bilanciata e uscita bilanciata). 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.ti.com/product/TS3A5017/description, 165mhz, 11Ω | ** http://www.ti.com/product/TS3A5017/description, 165mhz, 11Ω | ||
** [http://www.mouser.com/ds/2/149/FSAV331-112579.pdf FSAV331] usato in [https://martein.home.xs4all.nl/pa3ake/hmode/IF_detector.html pa3ake IF_detector board] (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 | * http://www.analog.com/en/switchesmultiplexers/multiplexers-muxes/adg704/products/product.html SP4T, 2.5 Ω, +1.8 V to +5.5 V | ||
Revision as of 18:08, 26 March 2018
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
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!
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
Bilanciati
- http://home.snafu.de/graff/sbt40.pdf rf splittata a condensatori, LO split a porte logiche
- 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
- 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 3257 usato da kx2 e kx3, che ne usano due
- http://www.ti.com/product/SN74CBT3257 4 poli 2 vie, 500Mhz, 4-5.5v, 4Ω,
- 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
- FST3253 usato da softrock (uscita sbilanciata), qrplabs e JUMA-TRX2 (entrata bilanciata e uscita bilanciata). 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 (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)
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:
- 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