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| 型號(hào)： | ATS636LSETN-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | RESISTOR, FIXED, FILM, CHIP |
| 中文描述： | 可編程回到偏霍爾效應(yīng)的聚烯烴功能開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 6/15頁(yè) |
| 文件大?。?/td> | 814K |
| 代理商： | ATS636LSETN-T |
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ATS635LSE and ATS636LSE
PROGRAMMABLE TRUE POWER-ON HALL-EFFECT GEAR-TOOTH SWITCHES
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright 2005 Allegro MicroSystems, Inc.
Regulator
Amplifier
Sample/
Hold
CLOCK
Hall Element
FUNCTIONAL
DESCRIPTION
Chopper-Stabilized Technique
.
The basic Hall sensor
is a small sheet of semiconductor material in which a
constant bias current will flow when a constant voltage
source is applied. The output will take the form of a
voltage measured across the width of the sheet and will
have negligible value in the absence of a magnetic field.
When a magnetic field with flux lines at right angles to
the Hall current is applied, a small signal voltage directly
proportional to the strength of the magnetic field will
occur at the output terminals.
This signal voltage is proportionally small relative to the
offset produced at the input of the chip. This makes it
very difficult to process the signal and maintain an
accurate, reliable output over the specified temperature
and voltage range. Therefore, it is important to reduce
any offset on the signal that could be amplified when the
signal is processed.
Chopper Stabilization is a unique approach used to
minimize input offset on the chip. This technique
removes a key source of output drift with temperature
and stress, and produces a 3X reduction in offset over
other conventional methods.
This offset reduction Chopping Technique is based on a
signal modulation-demodulation process. The undesired
offset signal is separated from the magnetically induced
signal in the frequency domain. The offset (and any low
frequency noise) component of the signal can be seen
as signal corruption added after the signal modulation
process has taken place. Therefore, the DC offset is not
modulated and remains a low frequency component.
Consequently, the signal demodulation process acts as
a modulation process for the offset causing the
magnetically induced signal to recover its original
spectrum at baseband while the DC offset becomes a
high frequency signal. Then, using a low pass filter the
signal passes while the modulated DC offset is
suppressed.
The advantage of this approach is significant offset
reduction, which de-sensitizes the chip against the
effects of temperature and stress. The disadvantage is
that this technique features a demodulator that uses a
sample and hold block to store and recover the signal.
This sampling process can slightly degrade the Signal-
to-Noise Ratio (SNR) by producing replicas of the noise
spectrum at the baseband. The degradation is a
function of the ratio between the white noise spectrum
and the sampling frequency. The effect of the
degradation of the SNR is higher jitter, a.k.a. signal
repeatability. In comparison to a continuous time device,
the jitter spec can be increased by a factor of five.
Figure 1 – Concept of Chopper-Stabilization Algorithm
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相關(guān)代理商/技術(shù)參數(shù) |
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| ATS640A | 功能描述:晶體 64MHz 20pF 3OT -20C +70C RoHS:否 制造商:AVX 頻率:26 MHz 容差: 頻率穩(wěn)定性:50 PPM 負(fù)載電容:8 pF 端接類型:SMD/SMT 封裝 / 箱體:1210 (3225 metric) 工作溫度范圍:- 40 C to + 150 C 尺寸:2.5 mm W x 3.2 mm L x 0.85 mm H 封裝:Reel |
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