The Circuit Designer's Companion, 4th Edition

S

s.w.r, See Standing wave ratio (s.w.r.)

S/LSTTL logic, See Schottky/low-power Schottky TTL logic (S/LSTTL logic)

Saber models, 257

Safe currents in PCB tracks, 62, 62f

Safe operating area (SOA), 185, 343

curve, 185, 186f

second breakdown, 185

Safety approvals, 352–353

Safety classes, 404–405

Safety earth, 23–24, 23f

Safety issues, general product design, 402–403

Safety protection, design considerations for, 405–406

Safety-class I (earthed) mains-powered equipment, 20

Safety-critical systems, 422

Sagging (A_OL), 229

“Sample and hold” conditioner, 294, 295f

Saturation, 135, 183–184, 184f

Scanning electron microscope image, 137, 137f

Schade’s curves, 338

Schmitt trigger

gate, 275

logic input, 270

Schottky diodes, 169–170

general purpose, 169

rectifiers, 170

RF mixers, ...