电子工程术语和定义,以字母O打头

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OC 过流。
OC-48 传输能力为每秒2400兆比特的光纤线路。
OEM 原始设备制造商。
OFC 开放式光纤控制。
OFDM 正交频分复用:一种信号复用技术,将可用的带宽分成若干个频率,称为音调。Flarion利用5GHz信道,并将每信道分成400个离散的音调(有微小的频率差异),正交音调之间不会相互干扰。采用跳频技术可提供更可靠的数据服务。
ohm 请参考:阻抗
OLED 有机发光二极管:由有机材料制成的LED,加电时有机发光二极管(OLED)发光。可以选择屏幕中的像素二极管导通或关闭,构成图像。这种显示方式比电流发光二极管更亮,效率更高。
OLED vs WLED

OLED

OLED technology uses organic (carbon-based) materials, instead of semiconductor (e.g., Silicon, Indium) materials used by standard LEDs. Each pixel of an OLED display comprises a red, green, and blue diode (Figure 1) which emit light when a voltage is applied to them. Each diode can be switched on and off in different combinations and with different intensities to illuminate pixels, which then combine to create images on a screen.

What is the Difference Between OLED and WLED?

WLED (white light emitting diode) is a term usually associated with television and mobile phone LCD displays. Although WLED is marketed as being in some way “different” or “superior” to standard LEDs, WLED and LED technology are identical using semiconductor materials. The white light produced is used as a ‘backlight’ for LCD displays and is created by applying an electric field to a blue (or UV) LED and then filtering the emitted light through a material of a different colour (e.g., a yellow phosphor). The combination of the light and filter create (almost) white light. In an LCD display, this light is then polarized using arrays of many liquid crystals, which operate under the influence of variable electric fields to create images on a screen.

What are the Relative Advantages and Disadvantages of OLED/WLED?

The main advantage of OLED technology is that it allows displays to be much thinner (up to 10x) than displays made using LCD technology (with WLED backlight). Another important advantage is that because OLED displays do not need a backlight, they consume less power. This is critical for battery-powered displays (e.g., smartphones) as it means the battery does need to be charged as often. However, some disadvantages of OLED displays are that they are less water-resistant and the colors they produce deteriorates over time.

rbg diodes in oled display

Figure 1. RGB diodes in an OLED display

Learn MoreLED Driver ICs

WLED

WLED is a term usually associated with television and mobile phone LCD displays. Although WLED is marketed as being in some way “different” or “superior” to standard LED, WLED, and LED technology are identical, using semiconductor materials. The white light produced is used as a ‘backlight’ for LCD displays and is created by applying an electric field to a blue (or UV) LED and then filtering the emitted light through a material of a different color (e.g., a yellow phosphor). The combination of the light and filter create a white (or almost white) light. In an LCD display, this light is then polarized using arrays of many liquid crystals, operating under the influence of variable electric fields, to create images on a screen.

What is the Difference Between WLED and OLED?

OLED (organic light emitting diode) technology uses organic (carbon-based) materials, instead of semiconductor (e.g., silicon or indium) materials used by standard LEDs. Each pixel of an OLED display comprises a red, green, and blue diode which emit light when a voltage is applied to them. Each diode can be switched on and off in different combinations and with different intensities to create images on a screen.

What are the Relative Advantages and Disadvantages of OLED/WLED?

The main advantage of OLED technology is that it allows displays to be much thinner (up to 10x) than displays made using LCD technology (with WLED backlight). Another important advantage is that because OLED displays do not need a backlight, they consume less power. This is critical for battery-powered displays (such as smartphones) as it means the battery does need to be charged as often. However, some disadvantages of OLED displays are that they are less water-resistant and the colors they produce deteriorates over time.

OLT 光纤传输。
One Wire 请参考:1-Wire
OneWire 请参考:1-Wire
ONT 请参考:ONU
ONU ONT (光网络终端),也称为ONU (光网络单元),代表光纤到户(FTTH)链路的消费类产品或设备。ONT/ONU通过无源光纤分配器从OLT (光纤线路终端)接收下行数据,为用户提供视频、语音、宽带服务。
Op amp 运算放大器:理想运算放大器的输入阻抗、开环增益、带宽均为无穷大,输出阻抗和噪声为零。它具有同相和反相输入端,通过反馈配置可以得到各种功能电路。

利用运算放大器可以简单实现放大、比较、对数放大、滤波器、振荡器、数据转换、电平转换、基准等多种功能,可轻松完成加、减、乘等综合数学运算。

实际的运算放大器具有有限的参数指标,但在绝大多数应用中足以近似为理想运放,使得大量的低成本、高性能模拟应用得以实现。它们是模拟设计中的“模块”电路。

节点分析是运算放大器设计的关键要素,流入、流出同相(+)和反相(-)输入端的电流决定了电路的特性。

请参考:Nodal Analysis of Op Amp Circuits,该文详细探讨了上述问题。

另请参考其它有关放大器的设计讲座:放大器的设计讲座

Maxim拥有数以百计的运算放大器(和其它放大器)
opamp 请参考:运算放大器
Open-collector 请参考:开漏
Open-drain 漏极开路或集电极开路引脚由一个晶体管驱动,该晶体管仅将引脚拉至一个电平(通常为地电平)。当输出关断时,引脚处于浮空(开路或高阻)状态。例如,n沟道晶体管在导通时将信号拉至地电平,关断时将其置于开路状态。

漏极开路表示采用FET工艺实现的电路,晶体管的漏极连接到输出端;集电极开路则表示利用双极型晶体管的集电极实现这一功能。

晶体管关断时,信号可由其它器件驱动,也可以通过一个电阻上拉或下拉。电阻可避免没有定义的浮空状态(相关术语请参考:高阻)。

operational amplifier 请参考:运算放大器
operational transconductance amplifier 请参考:跨导放大器
Optical Network Termination 请参考:ONU
Optical Network Unit 请参考:ONU
OR 两个信号中,无论那个信号为高,输出即为高。可由OR逻辑门电路实现(两路输入、一路输出,任何一路输入为高时输出高电平)。

还可通过“线或”连接实现,将两路信号简单地连接在一起,它们中的任何一路为高电平时将输出拉高。这种方式只能用于通过电源上拉、下拉的信号,采用阻性负载(例如:“漏极开路”输出)。
OR-ing 请参考:“或”逻辑
Orthogonal Frequency Division Multiplexing 请参考:OFDM
Oscillator

What is an Oscillator?

An electronic oscillator circuit generates an electrical signal which varies periodically in amplitude (voltage) over time such as a sine wave, square-wave, or triangle wave (Figure 1). While some electronic oscillator circuits produce a signal of a fixed amplitude and frequency, in many oscillator circuits the amplitude can be increased or decreased (within design parameters) as required and the frequency of the signal can be varied (tuned). A signal generator is an example of an electronic oscillator (Figure 1).

 oscillator signal generator

Figure 1. Signal Generator

How can you see a signal from an Oscillator?

The signal produced by an electronic oscillator can be viewed using a piece of equipment called an oscilloscope, which displays the signal on a screen where the y-axis represents voltage and the x-axis represents time.

oscilloscope oscillator

Figure 2. Oscilloscope

The length of time that elapses before a signal begins to repeat is called the wavelength (λ) and this is the inverse of its frequency (F). The relationship between frequency and wavelength is as follows:

F = 1/λ

 

What do the terms “Amplitude” and “Wavelength” mean?

The difference between the maximum displacement and average of a signal is called the amplitude or peak voltage (Vpk).

Most modern oscilloscopes can be programmed to automatically show the voltage and frequency of the displayed signal.

 

Learn More

Silicon and Crystal Oscillators

OTA 请参考:跨导放大器
Output to Input Ratio 检测电流与放大器输出之比。
Overvoltage Protection 过压保护电路(OVP)为下游电路提供保护,使其免受过高电压的损坏。OVP电路监测外部电源(如:离线电源或电池)的直流电压,通过下述两种方式中的一种保护后续电路:撬棍钳位电路或串联开关。

撬棍电路对电源进行短路或钳位,限制电源电压,并触发可能的保护功能,如:保险丝。请参考撬棍电路

串联开关则利用MOSFET或晶体管作为开关元件串行连接在电源线上,发生过压时,OVP电路迅速关闭MOSFET,断开与下游电路的连接。

请参考:保护与隔离产品
OVP 请参考:短路电流