zener diode

ze·ner diode

or Ze·ner diode Z0009500 (zē′nər)n. A silicon semiconductor device used as a voltage regulator because of its ability to maintain an almost constant voltage with a wide range of currents.

[After Clarence Melvin Zener (1905-1993), American physicist.]

Zener diode

(ˈziːnə) n (Electrical Engineering) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator[C20: named after C. M. Zener (1905–93), US physicist]

ze′ner

(or Ze′ner) di`ode

(ˈzi nər)
n. a semiconductor diode across which the reverse voltage remains almost constant over a wide range of currents, used esp. to regulate voltage. [1955–60; after U.S. physicist Clarence Melvin Zener (born 1905)]

Zener diode

Zener diode:

see diodediode
, two-terminal electronic device that permits current flow predominantly in only one direction. Most diodes are semiconductor devices; diode electron tubes are now used only for a few specialized applications.
..... Click the link for more information. .

Zener diode

[′zē·nər ′dī‚ōd] (electronics) A semiconductor breakdown diode, usually constructed of silicon, in which reverse-voltage breakdown is based on the Zener effect.

Zener diode

A two-terminal semiconductor junction device with a very sharp voltage breakdown as reverse bias is applied. The device is used to provide a voltage reference. It is named after C. Zener, who first proposed electronic tunneling as a mechanism of electrical breakdown in insulators. See Semiconductor

A classic circuit to define a very stable current uses an operational amplifier and three stable resistors (see illustration). The voltage across the Zener itself defines a higher level from which the current is drawn. Thus, a stable noise-free Zener defines its own stable noise-free current. See Operational amplifier

The effect of temperature on the breakdown voltage can be nulled by having a second forward-biased junction, which has a small negative temperature coefficient, in series with the Zener junction. Such a device is called compensated Zener and has a breakdown voltage of 6.2 V rather than the normal 5.6 V (for the smallest possible temperature coefficient). Alternatively, a Zener junction can be part of an integrated circuit which adds a whole temperature controller to keep the silicon substrate at a constant temperature. For the very best performance, only four components are integrated into the silicon: the Zener, a heater resistor, a temperature-sensing transistor, and a current-sensing transistor. A separate selected dual operational amplifier then completes the current-and-temperature-control circuit. Such a circuit sets the chip temperature at, say 122°F (50°C), and the junction condition is then largely independent of ambient temperature. See Integrated circuits

The compact, robust Zener diode, with the circuits described to set its current and temperature, makes a fine portable voltage standard. This is used to disseminate the voltage level from national or accredited calibration laboratories to industry and to research laboratories. See Voltage measurement

单词	zener diode
释义	zener diode ze·ner diode or Ze·ner diode Z0009500 (zē′nər)n. A silicon semiconductor device used as a voltage regulator because of its ability to maintain an almost constant voltage with a wide range of currents. [After Clarence Melvin Zener (1905-1993), American physicist.] Zener diode (ˈziːnə) n (Electrical Engineering) a semiconductor diode that exhibits a sharp increase in reverse current at a well-defined reverse voltage: used as a voltage regulator[C20: named after C. M. Zener (1905–93), US physicist] ze′ner (or Ze′ner) di`ode (ˈzi nər) n. a semiconductor diode across which the reverse voltage remains almost constant over a wide range of currents, used esp. to regulate voltage. [1955–60; after U.S. physicist Clarence Melvin Zener (born 1905)] Zener diode Zener diode: see diodediode , two-terminal electronic device that permits current flow predominantly in only one direction. Most diodes are semiconductor devices; diode electron tubes are now used only for a few specialized applications. ..... Click the link for more information. . Zener diode [′zē·nər ′dī‚ōd] (electronics) A semiconductor breakdown diode, usually constructed of silicon, in which reverse-voltage breakdown is based on the Zener effect. Zener diode A two-terminal semiconductor junction device with a very sharp voltage breakdown as reverse bias is applied. The device is used to provide a voltage reference. It is named after C. Zener, who first proposed electronic tunneling as a mechanism of electrical breakdown in insulators. See Semiconductor A classic circuit to define a very stable current uses an operational amplifier and three stable resistors (see illustration). The voltage across the Zener itself defines a higher level from which the current is drawn. Thus, a stable noise-free Zener defines its own stable noise-free current. See Operational amplifier The effect of temperature on the breakdown voltage can be nulled by having a second forward-biased junction, which has a small negative temperature coefficient, in series with the Zener junction. Such a device is called compensated Zener and has a breakdown voltage of 6.2 V rather than the normal 5.6 V (for the smallest possible temperature coefficient). Alternatively, a Zener junction can be part of an integrated circuit which adds a whole temperature controller to keep the silicon substrate at a constant temperature. For the very best performance, only four components are integrated into the silicon: the Zener, a heater resistor, a temperature-sensing transistor, and a current-sensing transistor. A separate selected dual operational amplifier then completes the current-and-temperature-control circuit. Such a circuit sets the chip temperature at, say 122°F (50°C), and the junction condition is then largely independent of ambient temperature. See Integrated circuits The compact, robust Zener diode, with the circuits described to set its current and temperature, makes a fine portable voltage standard. This is used to disseminate the voltage level from national or accredited calibration laboratories to industry and to research laboratories. See Voltage measurement MedicalSeediodeAcronymsSeezip disk
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