2,259 technical terms and definitions
bardeen brattain 1947 step 1 germanium selection, select n type germanium rectifier grade, minority carrier lifetime diffusion length point spacing
Select N-Type Germanium: Rectifier-Grade Purity Is Necessary but Not Sufficient for Transistor Action Bardeen and Brattain's December 1947 point-contact transistor began with…
bardeen brattain 1947 step 9 wash dry surface, wash away treatment residue dry the surface, prepare germanium surface for direct metal contact, rinse conditioned surface without undoing treatment
Wash Away the Treatment Residue and Dry the Surface: Undoing Step 9's Byproducts Without Undoing Step 9 Itself Step 9 deliberately set the surface's electronic condition through…
bardeen brattain 1947 step 10 solder drop point, place small drop of molten solder on the point, solder composition point contact electrical forming, phosphor bronze wire tip solder bead point contact
Place a Small Drop of Molten Solder on the Point: The Sequence Switches Subjects Without Announcing It Every step from 1 through 9 worked on the same object — a single piece…
bardeen brattain 1947 step 11 spring arm point, attach the formed point to a spring arm, spring arm stiffness point contact force germanium, joint resistance mechanical force point contact assembly
Attach the Formed Point to a Spring Arm: The Mechanism Step 7 Already Had to Anticipate Now Actually Exists Step 7 built a mount stiff enough to resist a spring force that, at…
bardeen brattain 1947 step 12 seat point assembly, apply spring tension and seat the point assembly, first contact germanium point under full tension, seating stability point spacing under tension
Apply Spring Tension and Seat the Point Assembly: Where Two Separately Built Objects Finally Touch Everything from Step 1 through Step 10 built and verified one object…
bardeen brattain 1947 step 13 collector spacing, place the collector point near the emitter point, emitter collector point spacing diffusion length, two point separation measurement before seating
Place the Collector Point Near the Emitter Point: The Number Every Earlier Step Only Talked About Step 1 argued that diffusion length has to exceed point spacing. Step 3 ground…
bardeen brattain 1947 step 14 electrical forming, form the point contacts with a current pulse, electrical forming point contact transistor action, melted recrystallized alloy region point contact
Form the Point Contacts With an Electrical Current Pulse: The One Step That Deliberately Damages What Every Other Step Protected Every step since Step 2 has worked the same way…
bardeen brattain 1947 step 15 seal cartridge housing, attach the cartridge leads and seal the housing, cartridge lead resistance series base electrode, sealing process spring tension point spacing risk
Attach the Cartridge Leads and Seal the Housing: The Last Step That Can Still See What It Is Sealing In Every step from Step 1 through Step 15 was inspectable. A defect could be…
bardeen brattain 1947 step 17 common base circuit, use the base as the common reference terminal, common base circuit topology point contact transistor, power gain impedance mismatch emitter collector
Use the Base as the Common Reference Terminal: The Sequence Stops Building and Starts Operating Step 16 sealed a device with three external leads and nothing yet telling anyone…
bardeen brattain 1947 step 18 forward bias emitter, apply small positive emitter voltage relative to base, forward bias emitter hole injection germanium, small signal bias point linear region
Apply a Small Positive Emitter Voltage Relative to the Base: The Circuit Finally Does What Step 1 Chose It For Step 17 decided which terminal would be common, but a topology…
bardeen brattain 1947 step 19 reverse bias collector, apply negative collector voltage relative to base, reverse bias collector depletion field germanium, breakdown voltage operating margin
Apply a Negative Collector Voltage Relative to the Base: The Same Point, the Opposite Instruction Step 18 made the emitter point inject by applying a small positive voltage…
bardeen brattain 1947 step 2 cut germanium body, cut small block or disc germanium, saw damage machining allowance germanium body, create the semiconductor body point contact
Cut a Small Block or Disc: The First Operation That Can Destroy What Step 1 Selected For Step 1 accepted a germanium sample on the strength of a property that lives in the bulk…
bardeen brattain 1947 step 20 collector load, connect a load in the collector circuit, load line collector current voltage swing, convert collector current changes into output signal
Connect a Load in the Collector Circuit: Current Alone Is Not Yet a Signal Step 19 put the collector into reverse bias and gave it a steady current to carry, but a current flowing…
bardeen brattain 1947 step 21 small signal emitter, apply a small signal between emitter and base, modulate carrier injection small signal amplitude, diffusion crossing time frequency limit
Apply a Small Signal Between Emitter and Base: The Device Stops Sitting Still Every step from Step 17 through Step 20 set up a fixed condition and then held it there — a reference…
bardeen brattain 1947 step 22 verify amplification, measure the response across the collector load, verify signal amplification and power gain, voltage gain power gain impedance mismatch
Measure the Response Across the Collector Load: The Question Step 1 Opened Finally Gets Answered Step 1 opened this entire sequence with a warning: rectifier-grade purity alone…
bardeen brattain 1947 step 3 grind contact face, grind the contact face flat germanium, contact face roughness point spacing germanium, provide surface for point contacts
Grind the Contact Face Flat: A Standard Set by a Distance That Does Not Exist Yet Step 2 left behind an oversize block with a damaged shell on every sawn face and no flat…
bardeen brattain 1947 step 4 etch germanium, chemically etch the germanium surface, diffusion limited self smoothing etch grinding damage, remove grinding damage expose bare germanium
Chemically Etch the Germanium: Removing the Damage the Grind Could Not Help but Leave Step 3 ground the contact face to its own standard, but grinding cannot finish the job it…
bardeen brattain 1947 step 5 base face grind etch, grind and etch the second contact area, base face timing immediately before metallization, freshly etched surface metal deposit germanium
Grind and Etch the Second Contact Area: The Face That Could Not Afford to Wait The contact face was ground and etched back in Step 3 and Step 4, then left alone, because nothing…
bardeen brattain 1947 step 5 base electrode, apply copper or gold base electrode germanium, spreading resistance broad base contact germanium, copper gold thin film resistivity base electrode
Apply Copper or Gold: The Base Electrode Solves the Same Resistance Problem by Doing the Opposite Thing Step 5 ground and etched the base face immediately before this step…
bardeen brattain 1947 step 6 mount germanium, attach base lead and mount the germanium, mount stiffness spring force point contact, lead joint resistance spreading resistance germanium
Attach the Base Lead and Mount the Germanium: Building for a Force That Does Not Exist Yet Step 6 finished the base electrode, but an electrode with no wire out to it and no way…
bardeen brattain 1947 step 7 reetch upper face, re-etch the upper face germanium contamination, stray metal contamination threshold surface states, conditional step line of sight deposition germanium
Re-Etch the Upper Face: The First Step in This Sequence That Might Not Run at All Every step so far has run unconditionally — the sample selected in Step 1 either passed its…
bardeen brattain 1947 step 8 condition surface, condition the active surface germanium, surface states surface potential point contact injection, controlled exposure versus uncontrolled surface formation
Condition the Active Surface: Bare Germanium Is Not Yet Electrically Ready Germanium Step 4 left the contact face chemically clean and structurally undamaged, and it would be…
bardeen brattain 1948 refinement two spring wires, use two sharpened spring wires instead of split foil, split foil wedge versus independent point contacts, individual placement of point contacts
1948 Refinement — Use Two Sharpened Spring Wires Instead of Split Foil: Naming a Choice This Series Already Made Everything from Step 10 through Step 13 of the original…
bardeen brattain 1948 refinement separation pressure, set their separation and pressure carefully, point spacing one to ten mils 25 to 250 micrometers, separation pressure patent reported good results
1948 Refinement — Set Their Separation and Pressure Carefully: The Number This Series Referenced but Never Stated Point spacing has been a load-bearing phrase in this series since…
bardeen brattain 1948 refinement reverse bias forming, optionally form contacts using reverse bias, reverse bias forming series resistor current limit, modify contact region improve characteristics
1948 Refinement — Optionally Electrically Form One or Both Contacts Using Reverse Bias: A Second, Different Forming Method The original construction sequence already included…
positive predictive value, precision of a classifier, true positives false positives, precision at k
Precision, in classification, answers one specific question: of everything the model flagged as positive, how many actually were? It's computed as true positives divided by true…
sintered silver die attach power module, wide bandgap double sided package, ev traction inverter thermal
Double-Sided Cooling Power Module A conventional power module pulls heat out through only one face of the die — the back side, bonded to a substrate and a single heatsink, while…
pad oxide strip, hot phosphoric acid, H3PO4 wet strip, selective nitride removal, STI module cleanup
The pad nitride strip removes the silicon nitride layer that protected the active silicon all the way through the entire STI module — trench etch, fill, and oxide recess — using…
BG bitline gate etch, high k metal gate DRAM, dual use integration, row decoder sense amp gate
The periphery gate etch, sometimes called BG or bitline-gate etch, is the same physical etch that forms the DRAM array's bitline stack, except run across the periphery region…
peri STI, row decoder isolation, sense amplifier isolation, etch loading periphery, shallow trench isolation periphery
Periphery STI is the same shallow trench isolation concept as cell STI, cut into the same wafer in the same process module, but wider and shallower because the periphery…
perf per watt, tops per watt, flops per watt, energy efficient accelerator
Performance per watt normalizes useful computing performance by electrical power. It is a central comparison for thermally constrained mobile devices, dense datacenters…
eprom eeprom history step 8 place eprom in its actual commercial niche before eeprom, eprom eeprom history step 8
Place EPROM in Its Actual Commercial Niche Before EEPROM 8. Where EPROM Actually Won Business, Despite the UV Limitation EPROM's UV-erase limitation did not keep it out of…
eprom eeprom history step 11 position eeproms byte level granularity against bulk storage, eprom eeprom history step 11
Position EEPROM's Byte-Level Granularity Against Bulk Storage 11. A Product-Positioning Fact, Not a Density Race EEPROM's byte-level (or small-page) erase and write granularity…
rf power amplifier, pa, gan pa, doherty amplifier, rf transmitter
Power amplifier (PA) is an electronic circuit that increases the power level of an RF or audio signal — converting DC supply power into output signal power. PAs are defined by…
grown junction 1951 final electrical tests, multi parameter specification acceptance region, correlated constraints yield loss, grown junction transistor final parametric test
Perform Final Electrical Tests: Checking Every Boundary at Once Every earlier electrical gate in this process checked one constraint in isolation — step eighteen's punch-through…
grown junction 1951 high purity germanium, germanium dioxide hydrogen reduction, zone refining germanium, minority carrier lifetime germanium purity
Prepare High-Purity Germanium: Reduction and Zone Refining Before Any Crystal Is Pulled Nothing about junction timing, pull rate, or dopant pellets matters if the starting…
grown junction 1951 position base wire, base wire placement probability, wrong region connection bonding error, grown junction transistor wire positioning yield
Position the Base Wire: A Binary Outcome, Not a Continuous Tradeoff Every positioning problem this process has solved so far has been a tradeoff between two competing continuous…
grown junction 1951 prepare dopant pellets, germanium acceptor donor pre alloy, dopant pellet mass measurement, grown junction transistor pellet composition
Prepare Dopant Pellets: Measuring the Dose Before the Melt Ever Sees It A dopant pellet is not a pinch of pure gallium or pure antimony metal dropped into the melt — it is…
grown junction 1951 prepare lead assembly, mount material thermal expansion germanium, lead assembly mechanical rigidity, grown junction transistor mount preparation
Prepare the Supporting Lead Assembly: Choosing Materials Before Any Heat Is Applied Everything this process still has ahead of it — soldering the bar's two ends, pulse-bonding…
grown junction 1951 prepare seed crystal, seed crystal orientation germanium, czochralski seed crystallographic axis, grown junction transistor seed selection
Prepare the Seed Crystal: Choosing the Orientation Everything Else Grows From The seed is not a generic sliver of germanium dipped into the melt to give the puller something…
grown junction 1951 pulse bond base wire, gallium doped gold wire bond, gold germanium alloy bond base, grown junction transistor pulse bonding
Pulse-Bond the Base Wire: A Bond That Forgives Its Own Placement Error The gold wire this step bonds to the base isn't pure gold — it carries a small, deliberate gallium content…
mask rom addressing step 6 price a maskset respin, price a maskset
Price a Mask-Set Respin When Even One Bit Is Wrong 1. Treat a Single Wrong Bit as a Whole-Set Problem A mask ROM's bit pattern was committed to a physical plate, not to…
spc
P chart is the attributes control chart used to monitor the proportion of nonconforming units in samples over time - it is the standard SPC method for defectives-rate surveillance…
fine-tuning
P-Tuning optimizes continuous prompt embeddings for enhanced few-shot and zero-shot performance. Difference from prompt tuning: Uses LSTM or MLP to generate prompt embeddings…
boron indium gallium, acceptor element, BF2 plus implant, channeling tilt angle, transient enhanced diffusion TED, pre amorphization implant, PMOS source drain, group III dopant, hole carrier silicon
P-type dopants are acceptor elements from Group III of the periodic table — overwhelmingly boron, with indium and gallium reserved for specialized applications — that create…
p-type silicon, boron-doped silicon, acceptor level, holes majority carriers, Hall effect, PMOS, positive-type
A p-type semiconductor is a semiconductor, usually silicon, doped with acceptor atoms such as boron so that mobile holes outnumber electrons and carry most of the current. The p…
quality & reliability
A p-value (probability value) is the probability, calculated under the assumption that a specified null hypothesis (H₀) is true, of obtaining a test statistic result at least as…
CMOS p-well, NMOS body region, well process, twin-well, counter-doped region, latch-up
A p-well is a region of p-type silicon deliberately created within an n-type substrate to host devices that require a p-type local environment, most importantly the n-channel…
p well process, single-well cmos, cmos well architecture, semiconductor process wells, twin-well cmos comparison
P-well CMOS process builds NMOS transistors inside a p-type well diffused into an n-type starting substrate, while PMOS transistors sit directly in the surrounding n-substrate…
monitoring
p50/p95/p99 latency refers to percentile latency metrics that describe the distribution of response times across all requests. Unlike averages, percentiles reveal how different…