Calculators
Microstrip design and analysis spreadsheet
Based on formulae in section 2.9 of "high Frequency Circuit Design and Measurements" P.C.L.Yip, ISBN: 0-412-34160-3
There is a more comprehensive free tool here: Applied Wave Research Inc. TXLINE
Return Loss and VSWR
Converts return-loss to reflection coefficient and VSWR.
Spring Coil Inductor Designer
Design close-wound air-cored spring inductors. Yields inductance, DC resistance and weight. Contains a useful SWG diameter look-up table.
Symmetrical Attenuators
Design your own wideband attenuators (making good quality devices is another matter). Not the easiest spreadsheet to use. Contact Tim if you get stuck.
Lossy Wideband Impedance Transformer
Design your own wideband impedance transformers (again making good quality devices is another matter).
ISO 7637-2 pulse 5a 12V Suppression
Determines the energy dissipated in an ISO7637 load dump pulse as a function of the suppressor clamping voltage. Determine the number of transient suppressors needed to safely absorb that energy.Pulse 5a (unlimited) for 12V systems.
ISO 7637-2 pulse 5a 24V Suppression
Determines the energy dissipated in an ISO7637 load dump pulse as a function of the suppressor clamping voltage. Determine the number of transient suppressors needed to safely absorb that energy.Pulse 5a (unlimited) for 24V systems.
ISO 7637-2 pulse 5b 24V Suppression
Determines the energy dissipated in an ISO7637 load dump pulse as a function of the suppressor clamping voltage. Determine the number of transient suppressors needed to safely absorb that energy.Pulse 5b (central limiter) for 24V systems.