生物医学工程专业英语之电子学基础.ppt

Electronic engineering 1. electronic 电的（与电有关的） 2. engineering 工程，工程学 3. circuit 电路 4. common-base 共基极 5. common-emitter 共发射极 6. common-collector 共集电极 7. transistor 晶体管，三极管 8. impedance 阻抗 9. ohm 欧姆 10. megohm 兆欧 11. voltage 电压 There are three basic ways of connecting transistors in a circuit: common-base, common-emitter, and common-collector. In the common-bas connection, the signal is introduced in to the emitter-base circuit and extracted from the collector-base circuit. Because the input or emitter-base circuit has a low impedance in the order of 0.5 to 50 ohms, and the output or collector-base circuit has a high impedance in the order of 1000 ohms to one megohm, the voltage or power gain in this type of configuration may be in the order of 1500. 12. rectifier整流器 13. diode 二极管 14. current 电流 Since current can flow through a diode in one direction, a diode can be used as a rectifier to change alternating current into direct current. 15. cycle 周期 During one half of the a.c.cycle the rectifier conducts and current flows through the rectifier to the load. 16. pulsate 博动，波动 17. amplitude 幅度 The current always flows in the same direction but the flow of current is not continuous and is pulsating in amplitude. 18. frequency 频率 The frequency of the output pulses is twice that of the half-wave rectifier. 19. in series 串联 20. in parallel 并联 Another rectifier circuit is known as the full-wave bridge rectifier circuit. In this arrangement, two rectifiers operate in series on each half of the cycle. 21. pulse 波，脉冲 22. positive 正的 23. negative 负的 24. baseline 基线 The pulse is made up of a positive step and a negative step. (if the step is above the baseline, it is called a positive step, if it is below the baseline it is called negative.) 25. waveform波形 26. rectangular矩形的，直角的 27. sawtooth 锯齿 Pulses waveforms used in electronic devices are: rectangular waveform, sawtooth waveform and so on. 28. capacitan