The Amp Hour

An Interview with Kendall Castor-Perry

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Welcome Kendall Castor-Perry, the Filter Wizard!

  • Working on filters after high school and saw a "Wireman wanted" sign at Kemo.
  • Stayed for 21 years, but got started sweeping the floors.
  • Heath Robinson vs Rube Goldberg
  • Learned out of databooks
  • Where do you point people for filters?
    • Not the Active Filter cookbook, though many would recommend it.
    • Circuit theory courses online
    • Starting with a scope
    • Parents owned a big house, rented out rooms, tenants would need help with record players
    • Moog's ladder filter, which is a voltage controlled filter
    • Kemo was general purpose lab instruments.
    • Filters requirements were moving faster than the engineer knowledge.
    • The days where you had to have filtering in front of a sampling ADC
    • Moved to Burr Brown to work on DACs
    • PCM1704
    • Filtering at the front end is only if you want really want super low noise or if there is a wide bandwidth front end
    • Broadly speaking the filtering has gone inside chips
    • "My job has always been to chase signals around"
    • A transducer is a piece of instantiated physics that turns a signal into a datastream
    • "Think of me as the Van Helsing of electronic design"
    • Information theory
    • SERDES
    • Using power supply instead of a voltage reference on DACs.
    • Then Kendall went to work at Cypress Semiconductor (makers of the PSOC among other things)
    • Doug Self
    • Making your own resistor could be a source of distortion
    • SPICE isn't bound by physics
    • Paul Rako
    • When you add components you lose the systems thinking for your design
    • Bob Pease skeptical of simulation (Paul wrote about what he really felt later)
    • SAPWIN - symbolic analyzer
    • FIR filter
    • "Pessimal signal" (opposite of "optimal" because it's pessimistic)
    • KHN - state variable filter
    • Prototyping using SPICE
    • Karl Popper
    • Disproof is the only thing the matters
    • Eric Bogatin's rules for engineers
    • Different types of filters
    • Monte Carlo analysis
    • Cypress active in the USB Audio space...the microphone we sent to Kendall may have had a chip in it he helped design!
    • Synchronous mode of USB audio
    • Follow the #FilterWizard on LinkedIn (or follow his profile page) or check out his published articles on Planet Analog
      • ...more
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      The Amp HourBy The Amp Hour (Chris Gammell and David L Jones)
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