Gunn
Effect
6.1A
Kroemer’s Lemma of
Proven Ignorance
Kroemer’s Lemma of
New Technology
Heterojunction Lineups
Lattice constant (A)
Gunn
Effect
6.1A
Kroemer’s Lemma of
Proven Ignorance
Kroemer’s Lemma of
New Technology
Heterojunction Lineups
Lattice constant (A)
Herb’s Bipolar Transistors
The Saga of HBTs
Drift Transistors are
better!
Drift Transistors are
better!
“…the drift transistor, this conceived
before its time by a young German
theorist at Darmstadt”
- James Early
Use a Widebandgap
Emitter !
Use a Widebandgap
Emitter !
Initial experiments
on Si-Ge alloys !
Graded Base makes a
better device!
Graded Base makes a
better device!
IBM SiGe HBT
GaInP Is a really good material to use !
Use heterojunctions
for contacts on
Emitter and Base !
Why not put the Collector on top?
Modern Embodiments
SiGe HBTs for analog, microwave and
mm-wave circuits
InGaP/GaAs HBTs
For cell phones
InP HBTs for mm-wave and THz applications
(Mark Rodwell)
Pathways for Communicating New Technology Ideas
Traditional View
Pathways for Communicating New Technology Ideas
More Realistic View
Herb’s Sketches & Explanations (~1980-1990)
Herb’s Napkin’s (~1980-1990)
Herb’s Napkin’s (~1980-1990)
Mustard
stains
Thanks, Herb !!!
Gunn
Effect
6.1A
Kroemer’s Lemma of
Proven Ignorance
Kroemer’s Lemma of
New Technology
Heterojunction Lineups
Lattice constant (A)