摘要:
The device comprises a low conductivity near intrinsic region (3) sandwiched between a heavily doped carrier injection region (1) and a heavily doped output region (5). The carrier injection region (1) has a wider band gap than the near intrinsic region (3), which contains a doped planar barrier (6) adjacent and parallel to the interface (2). The device has charge characteristics at the ballistic launcher interface that are different at different times and which give rise to different stabilities. The device has a 10 -12 second switching time.
摘要:
A Transistor-Transistor Logic (TTL) gate circuit is disclosed comprising an input transistor T1, an inverter transistor T2, an output transistor T3 and a pull-up transistor T4. When T2, T3 are non-conducting, VB appears at the output 12 and when T2, T3 are conducting, the output is substantially at earth. To achieve fast switching of T3 a different smaller amount of base current is applied to the inverter transistor T2 than is applied to the base of the output transistor T3. As shown, a current mirror circuit (T5, T6) can be used to control the amount of base current flowing between the input transistor (T1) collector terminal and the base terminal of the inverter transistor (T2). The mirror circuits limit the base current of T2 to an amount less than the base current that flows between the input transistor collector terminal and the base terminal of the output transistor T3. The value of R3 also limits the current though T2. In another embodiment, a resistor in series with the base of the inverter transistor performs the same function as the current mirror circuit.
摘要:
A field effect transistor having a highly doped gate wherein both the gate and the channel are different semiconductors with an energy band relationship that provides a barrier to both electrons and holes. The energy band relationship is staggered so that tunneling of electrons from the channel into the gate and holes from the gate into the channel is suppressed. An example structure is an InP light p conductivity type channel material (2) with a heavily doped AlInAs p⁺⁺ conductivity type gate (1).
摘要:
O A field induced base ballistic majority carrier transfer transistor comprises first and second epitaxial semi- conductor regions (1, 2) of the same conductivity type, the conductivity of the second region (2) being lower than that of the first region (1) and the second region having a lower energy bandgap than the first region. An emitter electrode (5) is connected, via a high conductivity region (3) epitaxial with the second region (2), to the side of the second region remote from the interface (8). A base electrode (6) makes contact with a part of the second region adjacent the interface (8), and a collector electrode (7) is connected to the side of the first region (1) remote from the interface (8). If the transistor is formed of n-type materials, application of a bias voltage across the emitter and base electrodes produces an accumulation layer (9) which serves as the base of the transistor, in the second region (2) adjacent the interface (8).