Figure 1 shows an example of on/off circuitry commonly used in battery-operated devices. The p-channel MOSFET, Q1, serves as a power switch. When you push the On button, S1, Q1's gate goes low. Q1 turns on and supplies battery voltage to the dc/dc co…

In multiple-output power supplies in which a single supply powers circuitry of vastly different current draws, two perplexing steps are sensing the current that each output draws and deactivating the power supply in the event of an overload on that o…

RFID Exploration Louis Yi, Mary Ruthven, Kevin O'Toole, & Jay Patterson What did you do? We made an Radio Frequency ID (RFID) card reader and, while attempting to create a long-range spoofer, created an jammer which overcomes card's signals. The read…

Transistor Tutorial Summary Transistor Tutorial Summary Bipolar Junction Transistor Tutorial We can summarise this transistors tutorial section as follows: The Bipolar Junction Transistor (BJT) is a three layer device constructed form two semiconduct…

A number of circuits, such as level detectors and AM demodulators, benefit from a rectifier with a low offset voltage. Silicon diodes have an offset of approximately 0.6V and do not work well in low-level circuitry. A Schottky diode is a bit better w…

1. Field of the Invention This invention relates in general to an integrated circuit and more specifically to well biasing circuitry for transistors of an integrated circuit. 2. Description of the Related Art Integrated circuits utilize transistors,…

前几天,一台Oracle数据库(Oracle Database 10g Release 10.2.0.4.0 - 64bit Production)监控出现"PMON failed to acquire latch, see PMON dump"错误,连接数据库出现短暂异常,告警日志中具体错误如下所示: Tue Dec 20 09:13:16 2016 PMON failed to acquire latch, see PMON dump Tue Dec 20 09:14:16 201…

原文链接:https://support.oracle.com/epmos/faces/DocumentDisplay?_adf.ctrlstate=23w4l35u5_4&id=1523934.1用途   提出问题,得到帮助并分享您的心得   排错步骤   什么是shared pool?   专用术语   Literal SQL   Hard Parse(硬解析)   Soft Parse(软解析)   完全相同的语句?   Sharable SQL   语句的版本   Library Cac…

1,数据的IO操作 SQL Server访问的任何一个Page必须存在于内存中,如果不存在于内存中,那么SQL Server发出 Disk IO请求,将数据页从Disk读取到内存中,然后SQL Server从内存中读取该Page的内容.在访问任何一个内存page之前,必须申请和获取该Page上的Latch. 在数据读取的过程中,SQL Server先在内存中预留一个Page的空间,并设置该Page的位BUF_IO=1,并发出Disk IO请求,此时,在该Page上加的Latch是PageIOLa…

1.Oracle锁类型 2.行级锁:DML语句 3.表级锁:TM 4.锁的兼容性 5.加锁语句以及锁的释放 6.锁相关视图 7.死锁 1.Oracle锁类型 锁的作用     latch锁:chain,链     LOCK锁         排他锁(X)         共享锁(S) 2.行级锁:DML语句 事务锁TX         锁的结构         事务锁的加锁和解锁过程     只有排他锁         不影响读(CR块) 3.表级锁:TM 行级排他锁(Row exclusive…