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The '''SSM 2040SSM2040''' IC is a [[Filters|4-pole filter]] from [[Solid State Micro Technology For Music]] (SSM). Regarded as one of the best sounding filters, because of the way resonance and small amounts of soft distortion when overdriven, can add harmonics to the original signal.<ref name="jg">''[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 [[OnChip Systems|Curtis]] ICs in later versions of the Prophet 5.<ref name="msl">[http://www.siliconbreakdown.com/msl/ssm2040History.html SSM 2040SSM2040 Voltage Controlled Filter Chip History], Mad Science Lab 2008</ref><ref>[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|exponentially]] [[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">[http://www.sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM 2044SSM2044 data sheet]</ref>
 
== Clones and schematics ==
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* [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
* [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 SSM 2040SSM2040 or clone ==
* [https://web.archive.org/web/20160211063850/http://www.amsynths.co.uk:80/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 3320]] 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>
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* Hearn Morley [[HM2040]] potted module.
* [http://www.siliconbreakdown.com/msl/DualFilter.html Mad Science Lab SSM2]
* [http://www.mattsonminimodular.com/shop/index.php?main_page=product_info&products_id=1 Mattson Mini Modular FV1-B], based on the SSM 2040SSM2040 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]
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== See also ==
* [[CEM 3320]]
* [[SSM 2044SSM2044]]
* [[SSM 2045SSM2045]]
 
== References ==
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== Further reading ==
* [http://www.sdiy.info/wiki/File:SSM2044_datasheet.pdf SSM 2044SSM2044 data sheet]
* Build a better music synthesiser by [[Thomas Henry]], Tab Books Inc, 1987, ISBN 0-8306-2753-3, 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
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== 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 [http://www.maxmidi.com/diy/ssm/index.html MaxMidi Rare Silicon] or [http://www.digisound80.co.uk/digisound/other_documents/brochure_files/SSM2040.pdf Digisound80.co.uk]
* [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://electronotes.netfirms.com/EN85part.pdf Additional Design Ideas For Voltage-Controlled Filters]'' by Bernie Hutchins, Electronotes 85, Volume 10, 1978, p. 5
* [http://www.homebuilthardware.com/index.php/projects/ssm2040-vcf/ SSM2040 VCF] by Ryan Williams, March 2007.
=== Projects ===
* ''[https://drive.google.com/file/d/0Bx5_5krPS9HMcThRRHRObjRwMUk/ Build the PGS Lowpass Voltage Controlled Filter]'', Common Mode, January 1983, Number 1, pp. 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://drive.google.com/file/d/0Bx5_5krPS9HMcThRRHRObjRwMUk/ Synthesizer Phase Shifter]'' by Thomas Henry, Polyphony, October 1984, pp. 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 ICs]]
[[Category:Filters]]
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