bjosephs
Well-known member
Hi All,
I was googling around on capacitor selection criteria and found this little article from TI that looks to be only a year old. I didn't see it anywhere on this site so I'm posting a link. The author provides measurement detail on some different capacitor types/scenarios and includes mitigation techniques. The big takeaway is the correlation between dielectric permittivity (k) and distortion because high-k dielectrics, though capable of ever smaller package sizes, also vary in capacitance with applied voltage. Also included are mitigating design considerations that may I have been discussed before:
I was googling around on capacitor selection criteria and found this little article from TI that looks to be only a year old. I didn't see it anywhere on this site so I'm posting a link. The author provides measurement detail on some different capacitor types/scenarios and includes mitigation techniques. The big takeaway is the correlation between dielectric permittivity (k) and distortion because high-k dielectrics, though capable of ever smaller package sizes, also vary in capacitance with applied voltage. Also included are mitigating design considerations that may I have been discussed before:
- Increase circuit impedance so the voltage drop across the capacitor is made smaller
- Reduce the -3db point as far below pass band as possible, also reducing voltage drop
- In the case of polarized caps, apply a modest bias voltage to prevent rectification effects