pec电气工程专业英语证书考试-电气专有名词

pec电气工程专业英语证书考试-电气专有名词内容摘要：

al signal from a sensor when no measured variable is present. Often referred to the output at noload condition. Bass Boost Circuitry that boosts the bass response of the amplifier, improving audio reproduction, especially when using inexpensive headphones. Battery Backup A feature of microprocessor supervisory circuits and some power supplies to switch between a main power source and a battery. Battery Freshness Seal A feature in microprocessor supervisory circuits which disconnects a backup battery from any downstream circuitry until VCC is applied the first time. This keeps a backup battery from discharging until the first time a board is plugged in and used, and thus preserves the battery life. Battery Fuel Gauge A feature or device that measures the accumulated energy added to and removed from a battery, allowing accurate estimates of battery charge level. Battery Monitor A feature that monitors the voltage on a battery and indicates when the battery is low. It is usually implemented using a parator to pare the battery voltage to a specified level. May also include functions such as charging, remaining capacity estimation, safety monitoring, unique ID, temperature measurement, and nonvolatile (NV) parametric storage. Battery Switchover A circuit that switches between the higher of a main supply and a backup battery. BCD Binarycoded decimal: Representation of a number in which each decimal digit (09) is encoded in binary, with four bits per decimal digit. BER Bit Error Rate: A measure of the number of erroneous bits which can be expected in a specified number of bits in a serial stream. BERT Bit Error Rate (BER) Tester: A piece of test equipment which determines the bit error rate for a device under test (DUT). BeyondtheRails™ A feature of amplifiers that allows input or output voltages to exceed the supply rails. BGA Ball grid array: A packaging technology. Bidirectional The device acmodates signals traveling either direction though a single channel. Bipolar Inputs An input which acmodates signals both above and below ground. Bipolar Junction Transistor A Bipolar Junction Transistor, or BJT, is a solidstate device in which the current flow between two terminals (the collector and the emitter) is controlled by the amount of current that flows through a third terminal (the base). Contrast to the other main transistor type, the FET, in which the ouput current is controlled by input voltage (rather than by input current). BIST Builtin selftest. Bit Banging A technique which uses the generalpurpose ports of a microcontroller to emulate a serial interface standard (I2C, SPI, etc). Bit Error Ratio The number of erroneous bits divided by the total number of bits transmitted, received, or processed over some stipulated period. Blade Server A blade server is a puter system on a motherboard, which includes processor(s), memory, a work connection, and sometimes storage. The blade idea is intended to address the needs of largescale puting centers to reduce space requirements for application servers and lower costs. Blink Control Controls the display segment blink rate. BLM Ball limiting metal Bluetooth A technology that allows voice and data connections between a wide range of mobile and stationary devices through shortrange digital twoway radio. For instance, it specifies how mobile phones, Wireless Information Devices (WIDs), puters and PDAs interconnect with each other, with puters, and with office or home phones. BLVDS Bus lowvoltage differential signal BOC Bitoriented code Boost Converter A power supply that steps an input voltage up (boosts it) to a higher, regulated voltage. Bootstrap Often refers to using the output of a stepup converter to drive the main power FET switch, providing more gate drive than the input can supply alone. Also refers to using a switched capacitor to boost the voltage of a node. BPON Broadband passive optical work BPSK Binary phaseshift keying BRD Bandrate divisor BreakBeforeMake BreakBeforeMake: A switch that is configured to break (open) the first set of contacts before engaging (closing) the new contacts. This prevents the momentary connection of the old and new signal paths. Applies to mechanical systems (. that use relays or manual switches) and to solidstate analog multiplexers and switches. BRI Bitrate interface Bridge Battery A battery intended to provide power to system memory while the main battery is replaced. BridgeTied Load Used in audio applications, the load (a speaker in this case) is connected between two audio amplifier outputs (it bridges the two output terminals). This can double the voltage swing at the speaker, pared to a speaker that is connected to ground. The groundtied speaker can have a swing from zero to the amplifier39。 s supply voltage. A BTLdriven speaker can see twice this swing because the amplifier can drive either the + terminal of the speaker or the — terminal, effectively doubling the voltage swing. Since twice the voltage means four times the power, this is a major improvement, especially in applications where battery size dictates a lower supply voltage — . automotive or handheld applications. Brightness Although the terms brightness and luminance are often used interchangeably, they are different. Luminance is the light intensity。 brightness is how it is perceived by the human eye. Broadband A transmission medium with enough bandwidth to carry multiple voice, video, or data channels simultaneously. This technique is used, for example, to provide fifty CATV channels on one coaxial cable。 or to provide Inter access over cable TV。 or to add DSL to a voicegrade telephone line. A mon technique is frequencydivision. Each channel is modulated to a different frequency band and bined in the transmission。