Question

Consider the following time parameters in development of solid state devices:

1. Domain growth time constant

2. Transit time

3. Dielectric relaxation time

In the case of Transferred Electron Devices (TED), which of these are used?

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3

Answer 1

Correct Answer - Option 4 : 1, 2 and 3

The various modes of operation of transferred electron device are classified on the basis of time in which various process occurs

τ_t: domain transit time

τ_d: dielectric relaxation time

τ_g: domain growth time

τ_o: the natural period of oscillation

Mode	Time Relationship
Stable Amplifier	τo ≥ τt
Gundomain	τg ≤ τt τo = τt
Quenched domain	τ g ≤ τt τo = τt
Delayed domain	τg ≤ τt τo > τt
CSA	τo < τg τo > τd