Podcast: Play in new window | Download
Subscribe: Apple Podcasts | RSS
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