急，请高手帮忙翻译一下毕业论文摘要，不要在线翻译的，谢谢！

Question

555定时器是一种应用极为广泛的中规模集成电路，因集成电路内部含有三个5千欧电阻而得名。555 定时器成本低，性能可靠，由于其使用灵活、方便，因而被广泛应用于信号的产生与变换、控制与检测、家用电器以及电子玩具等领域 。Pspice在电路系统仿真方面可以说独具特色，是其他软件无法比拟的，它是一个多功能的电路模拟试验平台,适于做系统及电路级仿真，具有快速、准确的仿真能力。本文做的是确定555定时器电路并用Pspice软件对其进行仿真分析，通过Pspice集成开发环境进行综合仿真。本文解决的主要问题是利用Pspice软件对555定时器电路构成的单稳态触发器电路，多谐振荡器电路，施密特触发器电路，PWM电路进行仿真，分析仿真结果。

关键词: 555；pspice；单稳态触发器；多谐振荡器；施密特触发器

Answer 1

555 Timer is a very wide range of applications in scale integrated circuits, because of three integrated circuits contained within the five named after the 1000 European resistance. 555 timer low-cost, reliable performance, because of their use of flexible, convenient and they have been widely used in the selection of signals and transform, control and testing, home appliances and electronic toys, and other fields. Pspice in circuit simulation system that can be unique, other software is second to none, it is a multi-function circuit simulation test platform, suitable for doing system and circuit-level simulation, with rapid and accurate simulation capability. This paper is determined to do the 555 timer circuit and software used Pspice its simulation analysis, Pspice through a comprehensive integrated development environment simulation. In this paper, to solve the main problem is to use Pspice software timer circuit of the 555 single-trigger circuit steady-state, multi-harmonic oscillator circuit, Schmitt trigger circuit, PWM circuit simulation and analysis of simulation results.

Keywords: 555; pspice; single steady trigger; more harmonic oscillator; Schmitt trigger