THE DESIGNERS: Natalie Kacik David Thomason Debashree Guruaribam
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Transcript of THE DESIGNERS: Natalie Kacik David Thomason Debashree Guruaribam
THE DESIGNERS:
Natalie KacikDavid Thomason
Debashree Guruaribam
Monophonic Analog Synthesizer
SPECSFrequency Range = 130.81 Hz 1046.5 HzControl Relation = 1V/Octave
CHOOSING THE BEST WAVEFORMWaveform Frequency content
Single frequency at fundamental
Increasing Frequency Content
The VCO(Voltage-Controlled
Oscillator)
𝑉 𝑜𝑢𝑡=¿+
-
𝐼𝐶=
𝑑𝑉𝑑𝑡 →
𝑑𝑉𝑑𝑡
1Δ𝑉
VCO Design
EC
The Exponential Converter
𝐼 𝑜𝑢𝑡=𝐼𝑏𝑖𝑎𝑠𝑒𝑉 𝑐𝑜𝑛𝑡
𝑉 𝑇𝐼𝑏𝑖𝑎𝑠𝑒
38.46∗𝑘∗𝑉 𝑐𝑜𝑛𝑡=𝐼𝑏𝑖𝑎𝑠2𝑉 𝑐𝑜𝑛𝑡
𝑘≈0.018
VCO PerformanceVcont Output Frequency
0V 103.84 Hz
1V 205.76 Hz
2V 409.83 Hz
3V 501.25 Hz
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
VCF Performance
VCF Output Bode PlotInput Current: 500pAInput Signal: 1mV (-60 dB)
Bandwidth-Current Relation
Attack-Release Envelope and Mixer
Our Amazingly Simple Mixer.
Gain Control Stage Small Signal
Amplification Stage
The Final Output:Filtered Signal mixed with the AR Wave
Putting it all together
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
Questions???
Adam Holzman(Musician)