AskDefine | Define slew

Dictionary Definition

slay v : kill intentionally and with premeditation; "The mafia boss ordered his enemies murdered" [syn: murder, hit, dispatch, bump off, polish off, remove] [also: slew, slain]slew n : (often followed by `of') a large number or amount or extent; "a batch of letters"; "a deal of trouble"; "a lot of money"; "he made a mint on the stock market"; "it must have cost plenty" [syn: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, muckle, peck, pile, plenty, pot, quite a little, raft, sight, spate, stack, tidy sum, wad, whole lot, whole slew]

Verb

1 turn sharply; change direction abruptly; "The car cut to the left at the intersection"; "The motorbike veered to the right" [syn: swerve, sheer, curve, trend, veer, slue, cut]
2 move obliquely or sideways, usually in an uncontrolled manner; "the wheels skidded against the sidewalk" [syn: skid, slip, slue, slide]slew See slay

User Contributed Dictionary

English

Pronunciation

  • /sluː/, /slu:/
  • Rhymes with: -uː

Etymology 1

From slua (noun only)

Noun

  1. A large number.
    She has a slew of papers and notebooks strewn all over her desk.

Etymology 2

In all senses, a mostly British spelling of slue.

Noun

  1. The act, or process of slewing.
  2. A device used for slewing.
  3. A change of position.

Verb

  1. To rotate or turn something about its axis.
  2. To veer a vehicle.
  3. To pivot.
  4. To skid.
  5. To make a public mockery of someone through insult or wit.

Etymology 3

Verb

slew
  1. simple past of slay

See also

Extensive Definition

In electronics, the slew rate represents the maximum rate of change of a signal at any point in a circuit. Limitations in slew rate capability can give rise to non linear effects in electronic amplifiers. For a sinusoidal waveform not to be subject to slew rate limitation, the slew rate capability at all points in an amplifier must satisfy the following condition:
\mathrm \ge 2\pi f \times V_,
where f is the frequency, and V_ is the peak amplitude of the waveform. Slew rate is usually expressed in units of V/µs.
In mechanics the slew rate is given in dimensions 1/T and is associated with the change in position over time of an object which orbits around the observer.

Definition

The output slew-rate of an amplifier or other electronic circuit is defined as the maximum rate of change of the output voltage for all possible input signals.
\mathrm = \max\left(\left|\frac\right|\right)
where v_\mathrm(t) is the output produced by the amplifier as a function of time t.

Measurement

The slew rate can be measured using a function generator (usually square wave) and oscilloscope. The unit of slew rate is V/µs. The slew rate is same for both when feedback is considered or not considered.

Slew rate limiting in amplifiers

There are slight differences between different op-amp designs in how the slewing phenomenon occurs. However, the general principles are the same as in this illustration.
The input stage of modern power amplifiers is usually a differential amplifier with a transconductance characteristic. This means the input stage takes a differential input voltage and produces an output current into the second stage.
The transconductance is typically very high — this is where the large open loop gain of the amplifier is generated. This also means that a fairly small input voltage can cause the input stage to saturate. In saturation, the stage produces a nearly constant output current.
The second stage of modern power amplifiers is, amongst other things, where frequency compensation is accomplished. The low pass characteristic of this stage approximates an integrator. A constant current input will therefore produce a linearly increasing output. If the second stage has a compensation capacitance C and gain A_, then slew rate in this example can be expressed as:
\mathrm = \frac
where I_\mathrm is the output current of the first stage in saturation.
slew in German: Slew rate
slew in Spanish: Slew rate
slew in French: Vitesse de balayage
slew in Italian: Slew rate
slew in Japanese: スルー・レート
slew in Portuguese: Slew Rate

Synonyms, Antonyms and Related Words

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