3. Найдите в тексте английские эквиваленты русских слов и словосочетаний. Пишите их на обоих языках.
1) микросхемы с фиксирующими диодами Шотки; 2) полностью запирать; 3) режим; 4) частотные свойства; 5) рассасывать; 6) запирать; 7) передача; 8) мощность рассеивания; 9) нс; 10) быстродействие; 11) ограничивающий, фиксирующий; 12) малое прямое падение напряжения; 13) излишний управляющий ток; 14) открывать; 15) предотвратить вхождение транзистора в режим насыщения; 16) область базы; 17) накапливать; 18) избыточные носители заряда; 19) время закрывания; 20) время спада выходного напряжения; 21) обычный; 22) более низкое прямое падение напряжения; 23) против отпирающих и запирающих помех; 24) уровень сигналов; 25) питающее напряжение.
Теперь проверьте: 1) Schottky-clamped TTL.circuits; 2) fully switch off; 3) mode; 4) frequency characteristics; 5) sweep away; 6) to cut off; 7) transfer; 8) power dissipation; 9) ns; 10) high speed; 11) clamping; 12) low forward voltage; 13) excess control current; 14) turn on; 15) to prevent the transistor from switching into saturation; 16) base region; .17) to store; 18/ excess carriers of charge; 19) t^rn-off time; 20) fall time of the output; 21) common; 22) lower forward voltage; 23) against noise voltages tending to switch on or off the circuit; 24) level of pulses; 25) supply voltage.
4. Изучив лексику задания 3, более полно и на английском языке выполните задания 1 и 2, стараясь не пользоваться подсказкой.
Текст 7
Part 5. IC MOS Logic
1. Thi§ is a popular family built on MOS field-effect transistors (FETs). Logic MOS circuits fall into two categories: static/ asynchronous & dynamic/synchronous. Static MOS circuits are similar to BJT logic circuits. Dynamic MOS circuits use clock pulses to make them operative in the synchronous mode. But the latter circuits did not find wide application.
2. The main component of a static MOS circuit is a static inverter or switch. The load in the switch circuit can be a linear resistor or a MOSFET which acts as a nonlinear resistor. The use of load transistors instead of high-value diffused resistors enables one to increase the packing density & to produce all elements in a single manufacturing cycle.
3. The switch uses single-type p-channel FETs, with the gate of the load transistor connected to the supply line. This is the basic switch of a wide class of MOS logic circuits.
4. A change in the input voltage by a certain value results in a variation of the output voltage from a high to a low level,. & vice versa. If, for instance, the input to the switch is a negative voltage sufficient to bias driving transistor into conduction, the output voltage will be close to zero.
5. If then the input is made to be at a voltage close to zero, the driving transistor will turn off & the voltage at the output will be high: If the high & low level of voltage correspond to logic H & L respectively, then the logic H input inverts to logic L output, & vice versa.
6. Simple MOS gates using p-channel FETs have two input transistors connected in series or in parallel; each driving a lo|id transistor. The circuits can perform NAND or NOR functioi^. They act as positive or negative.
7. In the circuit with the driver transistors connected in series, all the transistors are initially'off. If the input voltage on any one transistor is below the threshold level, this transistor remains off, as do other transistors in series with the first. Only if the input signals simultaneously arrive at the gates of all transistors can the-circuit perform the NAND function. The circuit can also operate as an inverter.
8. The speed of the logic gate with parallel-connected drivers is higher. If all the transistors are off, the output remains at a high level. If the input voltage on any one transistor is higher than the threshold value, this transistor turns on & the output drops to a low level. The gate thus realizes the NOR function.
Задаяия на развитие навыков ознакомительного чтения
1. Просмотрите текст, обращая внимание на основную мысль каждого абзаца.
