ANGLO-AMERICAN ARGUMENTATION Copyright © 2014 Natalie Reid [email protected].
THE DESIGNERS: Natalie Kacik David Thomason Debashree Guruaribam
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Transcript of THE DESIGNERS: Natalie Kacik David Thomason Debashree Guruaribam
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THE DESIGNERS:
Natalie KacikDavid Thomason
Debashree Guruaribam
Monophonic Analog Synthesizer
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SPECSFrequency Range = 130.81 Hz 1046.5 HzControl Relation = 1V/Octave
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CHOOSING THE BEST WAVEFORMWaveform Frequency content
Single frequency at fundamental
Increasing Frequency Content
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The VCO(Voltage-Controlled
Oscillator)
𝑉 𝑜𝑢𝑡=¿+
-
𝐼𝐶=
𝑑𝑉𝑑𝑡 →
𝑑𝑉𝑑𝑡
1Δ𝑉
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VCO Design
EC
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The Exponential Converter
𝐼 𝑜𝑢𝑡=𝐼𝑏𝑖𝑎𝑠𝑒𝑉 𝑐𝑜𝑛𝑡
𝑉 𝑇𝐼𝑏𝑖𝑎𝑠𝑒
38.46∗𝑘∗𝑉 𝑐𝑜𝑛𝑡=𝐼𝑏𝑖𝑎𝑠2𝑉 𝑐𝑜𝑛𝑡
𝑘≈0.018
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VCO PerformanceVcont Output Frequency
0V 103.84 Hz
1V 205.76 Hz
2V 409.83 Hz
3V 501.25 Hz
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Voltage-Controlled Filter
Operational Transconductance Amplifier (OTA)
𝐵𝑊 3 𝑑𝐵=𝑘𝑔𝑚
2𝜋𝐶
I out=gm¿
Bandwidth Equation:
OTA Transfer Characteristic Equation:
𝑘=𝑅3
𝑅4+𝑅3
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VCF Performance
VCF Output Bode PlotInput Current: 500pAInput Signal: 1mV (-60 dB)
Bandwidth-Current Relation
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Attack-Release Envelope and Mixer
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Our Amazingly Simple Mixer.
Gain Control Stage Small Signal
Amplification Stage
The Final Output:Filtered Signal mixed with the AR Wave
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Putting it all together
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Improvements(for the next design cycle)
• Higher frequency range VCO• Use higher order filters (instead of single pole)• ADSR• More effective mixer• Independent biasing circuits
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Questions???
Adam Holzman(Musician)