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]
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
- /sluː/, /slu:/
- Rhymes with: -uː
Etymology 1From slua (noun only)
- A large number.
- She has a slew of papers and notebooks strewn all over her desk.
Etymology 2In all senses, a mostly British spelling of slue.
- simple past of slay
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.
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.
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
batch, bunch, clump, cluster, considerable, copse, crop, deal, gobs, good deal, great deal, group, grouping, groupment, grove, hassock, heap, heaps, jillion, knot, lashings, loads, lot, lots, mess, million, mint, oodles, pack, peck, pile, piles, pot, quantities, quite a little, raft, rafts, scads, shock, sight, slews, spate, stack, stacks, stook, thicket, thousand, tidy sum, trillion, tuft, tussock, wad, wads, whole slew, wisp