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Chopper-Stabilized Precision Hall-Effect Switch
with Advanced Diagnostics
A1160
11
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Chopper Stabilization Technique
When using Hall-effect technology, a limiting factor for
switchpoint accuracy is the small signal voltage developed across
the Hall element. This voltage is disproportionally small relative
to the offset that can be produced at the output of the Hall IC.
This makes it difficult to process the signal while maintaining an
accurate, reliable output across the specified operating tempera-
ture and voltage ranges.
Chopper stabilization is a unique approach used to minimize
Hall offset on the chip. The Allegro technique, namely Dynamic
Quadrature Offset Cancellation, removes key sources of the out-
put drift induced by thermal and mechanical stresses. This offset
reduction technique is based on a signal modulation-demodula-
tion process. The unwanted offset signal is separated from the
magnetic field-induced signal in the frequency domain, through
modulation. The subsequent demodulation acts as a modulation
process for the offset, causing the magnetic field induced signal
to recover its original spectrum at baseband, while the DC offset
becomes a high-frequency signal. The magnetic sourced signal
then can pass through a low-pass filter, while the modulated DC
offset is suppressed. This configuration is illustrated in figure 4.
The chopper stabilization technique uses a 400 kHz, high
frequency clock. For demodulation process, a sample-and-hold
technique is used, where the sampling is performed at twice the
chopper frequency (800 kHz). This high-frequency operation
allows a greater sampling rate, which results in higher accuracy
and faster signal-processing capability. This approach desensi-
tizes the chip to the effects of thermal and mechanical stresses,
and produces devices that have extremely stable quiescent Hall
output voltages and precise recoverability after temperature
cycling. This technique is made possible through the use of a
BiCMOS process, which allows the use of low-offset, low-noise
amplifiers in combination with high-density logic integration and
sample-and-hold circuits.
The repeatability of magnetic field-induced switching is affected
slightly by a chopper technique. However, the Allegro high
frequency chopping approach minimizes the affect of jitter and
makes it imperceptible in most applications. Applications that are
more likely to be sensitive to such degradation are those requiring
precise sensing of alternating magnetic fields; for example, speed
sensing of ring-magnet targets. For such applications, Allegro
recommends its digital sensor IC families with lower sensitivity
to jitter. For more information on those products, contact your
Allegro sales representative.
Figure 4. Chopper stabilization circuit (Dynamic Quadrature Offset Cancellation)
Amp
Regulator
Clock/Logic
Hall Element
Sample and
Hold
Low-Pass
Filter