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由于許多要求相互矛盾,在大容量高速存貯器中,讀出放大器的設計可能是最困难的线路問题。对讀出放大器的这些要求包括:对信息分布不敏感、輸入阻抗可控制、寬的通频带、增益稳定、共式信号抑制強、可放大双向信号、参考电平稳定、高速比較器、低門檻电平,而且还希望价格低些。本文討論一种新线路,它簡单、且能滿足这些要求。打算将这种线路用于大容量(大于1000字)随机磁心和磁膜存貯器中。栈路能放大50毫伏的“1”信号,它具有50毫微秒的傳輸和比較延时。共式信号大至10伏,还不影响鑑别器的性能。线路的两个关鍵性的特点是:采用直接耦合差动前置放大器和隧道二极管鑑別器。直接耦合差动前置放大器的特点是:共式信号抑制强、增益稳定、对信息分布不敏感、并且能夠放大双向信号。隧道二极管构成一个优质鑑别器,因为它工作速度快、門槛电平低、門檻电平可以控制且不随溫度变化。于是,对前置放大器增益的大小和稳定性的要求就不严格了。文中推导了設計公式,并对完整的直流最坏情况进行了分析。叙述了某些应用时的线路变化,并給出了实驗数据。在附录Ⅱ中,討論了与前置放大器結合使用的隧道二极管鑑别器的一般問题。分析了某种輸入“1”“0”比时放大器跨导的允許容差,并且分析了偏流扣隧道二极管峯值电流的容差。
Because of many conflicting requirements, the design of sense amplifiers can be the most difficult line issue in high-speed, high-speed memories. These requirements for a sense amp include insensitive to the distribution of information, control of the input impedance, wide passband, stable gain, strong suppression of common signals, bi-directional signal amplification, stable reference levels, high-speed comparators, low threshold Level, but also hope that the price is lower. This article discusses a new line that is simple and meets these requirements. It is intended that this circuit be used in large-capacity (more than 1000 words) random magnetic and magnetic film memories. The stack path can amplify a 50 millivolt “1” signal, which has a 50 nanosecond transmission and comparison delay. The common signal up to 10 volts does not affect discriminator performance. Two key features of the line are: direct coupled differential preamplifier and tunnel diode discriminator. Direct coupled differential preamplifier is characterized by: common signal suppression strong, stable gain, insensitive to the distribution of information, and can amplify two-way signal. The tunnel diode constitutes a good discriminator because of its fast operating speed, low threshold level, and its threshold level control over temperature. As a result, the preamplifier gain size and stability requirements are not strict. The article deduces the design formula and analyzes the complete DC worst case. Described the line changes in some applications, and gives the experimental data. In Appendix II, the general problems of tunnel diode discriminators used with preamplifiers are discussed. The allowable tolerance of some transconductance of the amplifier with “1” and “0” inputs is analyzed and the tolerance of the peak current of the diode of the current-dumping tunnel is analyzed.