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The '''SSM 2040SSM2040''' IC is a [[Filters|4-pole filter]] from [[Solid State Micro Technology Forfor Music|SSM]]. The device's cutoff frequency can be [[Exponential|exponentially]] [[voltage controlled]] over a 10,000 to 1 range(SSM). It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.<ref name="data">[http://www.cem3374.com/docs/Manuals/datasheets/SSM2040_datasheet.pdf SSM2040 data sheet]</ref> Regarded as one of the best sounding filters, because of the way resonance and small amounts of sofsoft distortion when overdriven, can add harmonics to the original signal.<ref name="jg">''[https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM 2040SSM2040 Integrated Circuit]'', by James Gideon, 2006</ref>
 
== History ==
Designed by [[Dave Rossum]] of [[E-mu Systems]] and used in the first 2 versions of the [[Sequential Circuits Prophet 5]]. Early SSM chips were often defective, and having to pay royalties led Sequential to switch to [[Curtis ElectromusicOnChip SpecialtiesSystems|Curtis]] ICs in later versions of the Prophet 5.<ref name="msl">[https://web.archive.org/web/20141015041238/http://www.siliconbreakdown.com/msl/ssm2040History.html SSM 2040SSM2040 Voltage Controlled Filter Chip History], Mad Science Lab 2008</ref><ref>[https://web.archive.org/web/20141015041311/http://www.siliconbreakdown.com/msl/ssm2040manual.html SSM 2040SSM2040 VCF with LFO], Mad Science Lab 2008</ref>
 
== Circuit building block ==
The device's cutoff frequency can be [[exponential]]ly [[voltage controlled]] over a 10,000 to 1 range. It is an extremely flexible circuit building block which can be used in virtually any active filter design including low-pass, high-pass, band-pass and notch. Roll-off characteristics can be selected to be Butterworth, Chebyshev, Cauer, Bessel or any other filter type.<ref name="data">[https://sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]</ref>
 
== Clones and schematics ==
In chronological order:
* [https://web.archive.org/web/20160811193937/http://analogue.bytenoise.co.uk/message/70a13992bd45f021330686a0f3795f991885e041 discrete SSM2040-style filter] by [[Jürgen Haible]], 1997.
* [http://www.jhaible.com/tonline_stuff/jh2040.gif SSM2040 Style 4 pole Filter] by [[Jürgen Haible]], 1998. A [[discrete]] version that reproduces the original sound. A lot of component selection is needed (matching transistor pairs). The circuit is not a pin for pin replacement, and it has a voltage controlled resonance path added. There'a little error in the drawing: the pnp current mirrors have C and E mixed up.
* [http://www.schmitzbits.de/rs2040.html SMD SSM 2040SSM2040 filter] by René Schmitz, 1999
* [http://www5b.biglobe.ne.jp/~houshu/synth/Vcf0211a.GIF 4-pole VCF] by Osamu Hoshuyama, 2002
* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM 2040SSM2040 Integrated Circuit], by James Gideon, 2006
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM 2040SSM2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz.
* [http://electro-music.com/forum/topic-57575.html&postorder=asc Discrete Transistor 2040 SVVCF] by Scott Stites, electro-music.com forum, Apr. 2013
 
== Synthesizers etc. using the SSM2040 or clone ==
* [https://web.archive.org/web/20160211063850/http://www.amsynths.co.uk/mysynths/filter-bank/am8040-e-mu-systems-low-pass-filter/ AMSynths AM8040]
* [http://www.digisound80.co.uk/digisound/modules/80-7.htm Digisound 80-7]. In 1982 this was replaced by the [[CEM 3320CEM3320]] based 80-7A which offered the same features but with "lower noise and improved resonance level".<ref>[http://www.digisound80.co.uk/digisound/other_documents/brochure_files/1983-01_News_Notes.pdf News and Notes], January 1983, Digisound Ltd.</ref>
* [http://www.division-6.com/products/filtare-seiii-eurorack.php Division 6 Filtare SEIII]
* [http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/synthesizers/audity-overview/ E-mu Systems Blue Box and Audity]
* Hearn Morley [[HM2040]] potted module. ▼
* [http://synthark.com/synthesizer-museum/emu-gallery/emulator-archive/ssm/voice-card/ E-mu Systems SSM Voice Card]
* [http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]▼
▲* Hearn Morley [[HM2040]] potted module.
* [http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM2040 designed by [[Jim Patchell]]▼
▲* [https://web.archive.org/web/20160620213600/http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]
▲* [https://web.archive.org/web/20190613230500/http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM2040 designed by [[Jim Patchell]]
* [http://homepage2.nifty.com/rjb/diy_synthe3.htm Radio Junk Box 2040 VCF]
* [http://www.vintagesynth.com/misc/rsf_kobol.php RSF Kobol Expander I]
Line 25 ⟶ 31:
* [http://www.noniandjim.com/Jim/smb1/smb.html SMB-1 Project]
* [http://www.vintagesynth.com/misc/octavecat.php SRM Synthesizer Octave Cat]
* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
* [[Steiner EVI]]
* [http://www.synthtech.com/motm440.html Synthesis Technology MOTM-440]
* [https://web.archive.org/web/20150425232001/http://www.tiptopaudio.com/z2040.php Tiptop Audio Z2040]
* [https://web.archive.org/web/20130512191822/http://hammer.ampage.org/files/Device1-6.PDF VCF/Phase Shifter] by Craig Anderton, AMS-100 guitar processor, Device 6, 1979
* [https://web.archive.org/web/20130626235303/http://vedicscapes.bandcamp.com/track/model-2040 Vedic Scapes Model 2040], uses the HM2040
* [https://web.archive.org/web/20100706170531/http://hammer.ampage.org/files/Device1-4.PDF Voltage Controlled Phase Shifter module] by Craig Anderton, AMS-100 guitar processor, Device 4, 1979
 
{{stub}}▼
 
== See also ==
Line 39 ⟶ 43:
* [[SSM2044]]
* [[SSM2045]]
* [[IR3109]]
 
== References ==
Line 44 ⟶ 49:
 
== Further reading ==
* [https://sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM2044 data sheet]
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, {{ISBN 0830627533|0-830-62755-3}}, Chapter 6: ''A four-pole lowpass VCF -– SSM2040''
* ''Electronic Music Circuits'' by Barry Klein, Howard Sams, 1982,ISBN 0-672-21833-X, pages 125-126, 135-137, 141
* ''Two ICs For Electronic Music - SSM2020 And SSM2040Circuits'' by DaveBarry RossumKlein, [[Electronotes]]Howard 78Sams, Volume1982, 9{{ISBN|0-672-21833-X}}, 1977pages 125-126, p.135-137, 15141
* ''Reader'sTwo CircuitsICs -For VCFElectronic WithMusic – SSM2020 And SSM2040'' by RichDave RyanRossum, [[Electronotes]] 8478, Volume 9, 1977, p. 17&nbsp;15
* ''AReader's FourthCircuits Order– State-VariableVCF FilterWith SSM2040'' by BobRich ChidlawRyan, Electronotes 9984, Volume 119, 19791977, p. 3&nbsp;17
* ''A Fourth Order State-Variable Filter'' by Bob Chidlaw, Electronotes 99, Volume 11, 1979, p.&nbsp;3
* ''Musical Applications of Microprocessors'' by [[Hal Chamberlin]], Hayden, 1985 {{ISBN |0-8104-5768-7}}, pages 218-220, 599, 603
* ''The Smooth Phaser'' by Thomas Henry, Electronic Musician, June 1988, pp.&nbsp;78, 80-83.
 
== External links ==
* Circuit for dynamic control of phase shift, [http://www.google.co.uk/patents/US3969682 US Patent US3969682], by David Rossum, 1974
* SSM 2040SSM2040 data sheet at [https://web.archive.org/web/20150924171345/http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon], [http://www.cem3374.com/datasheets.htm CEM3374.com] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk]
* [https://web.archive.org/web/20160610133407/http://www.siliconbreakdown.com/msl/chip.html The SSM 2040SSM2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible.▼
* [http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007. ▼
* ''[https://web.archive.org/web/20190613230522/http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. &nbsp;5▼
* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM 2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz.▼
▲* [https://web.archive.org/web/20150316071329/http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
▲* [http://www.siliconbreakdown.com/msl/chip.html The SSM 2040 Integrated Circuit], by James Gideon, 2006. Discusses the IC, the ways it can be configured and the discrete version by Jürgen Haible.
=== Projects ===
▲* ''[http://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5
* ''[https://web.archive.org/web/20190613221410/https://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Build the PGS Lowpass Voltage Controlled Filter]'', Common Mode, January 1983, Number 1, pp.&nbsp;10–15
▲* [http://hem.bredband.net/bersyn/VCF/vcf-2040+vca.html SSM 2040SSM2040 style VCF + discrete VCA (AMORE)], 2011. Both circuits by René Schmitz.
* ''[https://web.archive.org/web/20190613221410/https://sdiy.info/wiki/File%3AThe_Reprint_Collection_by_Thomas_Henry_CC_BY_NC.pdf Synthesizer Phase Shifter]'' by Thomas Henry, Polyphony, October 1984, pp.&nbsp;14–17.
* ''[http://electro-music.com/forum/viewtopic.php?t=57575 Discrete Transistor 2040 SVVCF]'' by Scott Stites, electro-music.com, Apr 2013
 
[[Category:Linear integrated circuits]]
[[Category:Filters]]
[[Category:SSM ICs]]
▲{{stub}}
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