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* http://homepage.ntlworld.com/johngduffy/Project/Chapter2.htm#Multi | * http://homepage.ntlworld.com/johngduffy/Project/Chapter2.htm#Multi | ||
* http://zimmer.fresnostate.edu/~pkinman/pdfs/Receiver%20Architectures.pdf | * http://zimmer.fresnostate.edu/~pkinman/pdfs/Receiver%20Architectures.pdf | ||
* http://cdn.intechopen.com/pdfs/9961/InTech-Receiver_front_end_architectures_analysis_and_evaluation.pdf | |||
=== Weaver === | === Weaver === | ||
Revision as of 16:17, 24 September 2015
un ricevitore HF cosi piccolo da poterlo custodire comodamente tra le fauci
- piccolo
- economico
- a basso consumo (<100ma)
- a bassa tensione (3.3v)
VFO
Basta un Ondeggiatore!
Filtro di ingresso
set di filtri passa basso LC commutabili dimensionati per reggere in futuro un piccolo trasmettitore (<5W)
i sistemi di switch praticabili sono:
- commutatore meccanico: problemi di cablaggio e di contatti
- diodi PIN: consumano molto, non sembrano esistere per 3.3v
- microrelays DIP: consumano abbastanza e hanno problemi di contatto (a meno di non implementare il 'DC wetting', 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:
- Digital Bus Switch: hanno una Ron non indifferente, non reggono segnali molto forti, lavorano malino a 3.3v
- Analog FET switch
- gira voce che quelli che operano a 3.3v hanno una pompa di carica sul gate che fa rumore. verificare.
- cose del genere possono avere senso? 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/
Topologie
- http://homepage.ntlworld.com/johngduffy/Project/Chapter2.htm#Multi
- http://zimmer.fresnostate.edu/~pkinman/pdfs/Receiver%20Architectures.pdf
- http://cdn.intechopen.com/pdfs/9961/InTech-Receiver_front_end_architectures_analysis_and_evaluation.pdf
Weaver
Phasing
Miscelatore
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
Commutativo
http://www.oe1ira.at/sl/mix.html
http://g4oep.atspace.com/mixers/notes_on_the_basic_operation_of_.htm
http://www.m0rjd.co.uk/bus-switches.html occhio al bias
Switch integrati
- http://www.ti.com/product/ts3a4751 0.9 Ohm Low-Voltage Single-Supply Quad SPST Analog Switch tON = 14 ns, tOFF = 9 ns, essendo spst bisogna avere due segnali LO complementari
- 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
Bilanciati
- http://www.sm0vpo.com/_visitors/blocks/cmos-mix.htm non si capisce come possa funzionare
- 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/
- http://www.qsl.net/aa9gg/proj/dc40xx_ugly/dc40xx_ugly.htm
- Praticamente il n 3 bilanciato
- RF bilanciata (trasformatore)
- 74hc4053 3xSP2T
- OUT bilanciato
- http://www.m0nka.co.uk/?page_id=466
- RF bilanciata a trasformatore
- LO + !LO
- Out sbilanciato
H-mode
http://www.phonestack.com/farhan/mixermusings.pdf
ma uscire in audio da un trasformatore e' grigia
- http://martein.home.xs4all.nl/pa3ake/hmode/fsav430.html ma l'fsav430 pare semiintrovabile
- http://g4oep.atspace.com/mixers/notes_on_the_basic_operation_of_.htm#The%20QRSS%20Mixer. questo ha l'uscita audio
- http://www.qsl.net/g3oou/solidstatecircuits9.html con due SPDT
- magari in versione 2T
QSD
ma ci vuole il LO in quadratura o un accrocchio
- http://kc.flexradio.com/KnowledgebaseArticle50193.aspx SDR1000
- http://martein.home.xs4all.nl/pa3ake/hmode/IF_detector_qsd.html
- http://www.ti.com/lit/ds/symlink/sn74cb3t3253.pdf
- http://www.itsrainingelephants.com/blog-archives/tag/adg704/ http://www.analog.com/en/switchesmultiplexers/multiplexers-muxes/adg704/products/product.html
Altri mixer:
- http://www.analog.com/en/rfif-components/mixersmultipliers/ad8343/products/product.html ma 5v
- http://www.analog.com/en/rfif-components/mixersmultipliers/ad607/products/product.html basso consumo, if 400khz-12mhz, demod quadratura
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
Amplificatore audio
preamp e filtro LP:
- LVM772 http://www.ti.com/product/lmv772
- TL974 http://www.ti.com/product/tl974
- 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: