英語 での Zero-drift の使用例とその 日本語 への翻訳
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Voltage noise density of different zero-drift amplifiers. Figure 5.
Also, the output ripple of a zero-drift amplifier increases as the input frequency gets closer to the chopping frequency.
This combined technique allowswider bandwidth than was possible with conventional zero-drift amplifiers.
Basic Architecture of a Zero-Drift Amplifier Figure 1 shows the circuit diagram of a basic chopper amplifier in unity gain configuration.
As a matter of fact,the switching frequency is sometimes viewed as the figure of merit for zero-drift amplifiers.
The low offset of the zero-drift architecture enables current sensing with maximum drops across the shunt as low as 10 mV full-scale.
Also, the magnitude and frequencies of the switching artifacts differ for each zero-drift amplifier and from unit to unit.
Fortunately, zero-drift circuit-design techniques that continuously cancel out input offset voltages also tend to cancel the low-frequency input pink noise.
For applications requiring high precision and low drift at a higher bandwidth,it is important to use a zero-drift amplifier with higher switching frequency.
The zero-drift feature reduces the high 1/f noise typically found in CMOS input operational amplifiers, making it useful for a wide variety of low-frequency measurement applications.
The OPA4188 operational amplifier uses TI proprietary auto-zeroing techniques to provide low offset voltage(25 μV, maximum),and near zero-drift over time and temperature.
Note that all three zero-drift amplifiers tested exhibit some sort of switching artifacts. Some of the switching artifacts also repeat at its multiple integer frequencies.
Now Easy to Use in High Precision Circuits by Vicky Wong andYoshinori Kusuda Download PDF A zero-drift amplifier, as the name suggests, is an amplifier with offset voltage drift very close to zero.
Zero-drift amplifiers are used in systems with an expected design life of greater than 10 years and in signal chains that use high closed-loop gains(<100) with low-frequency(<100 Hz), low-amplitude level signals.
The MAX9617-MAX9620 feature rail-to-rail CMOS inputs and outputs,a 1.5MHz GBW at just 59μA supply current and 10μV(max) zero-drift input offset voltage over time and temperature.
Chopping timing diagram.Switching Artifacts as Shown on a Data Sheet Traditionally, zero-drift amplifiers have fairly large broadband noise and low switching frequencies, ranging from a few kilohertz to a few tens of kilohertz.
MAX9617EVKIT Evaluation Kit for the MAX9617- Maxim Description Create a design and simulate using EE-Sim® tools: The MAX9617 evaluation kit(EV kit)provides a proven design to evaluate the MAX9617 low-power, zero-drift operational amplifier(op amp) in a 6-pin SC70 package.
These devices are members of the zero-drift family of amplifiers that uses a proprietary auto-calibration technique to simultaneously provide low offset voltage(15 μV, max) and near-zero drift over time and temperature at only 28 μA(max) of quiescent current.
For example, in addition to chopping the offset voltage at 4.8 MHz, the ADA4522-2, a high voltage,dual, zero-drift amplifier, uses a patented offset and ripple correction loop circuity to minimize switching artifacts.
MAX9618EVKIT Evaluation Kit for the MAX9618- Maxim Description Create a design and simulate using EE-Sim® tools: The MAX9618 evaluation kit(EV kit)provides a proven design to evaluate the MAX9618 dual low-power, zero-drift operational amplifiers(op amps) in an 8-pin SC70 package.
Employ an application-optimized device such as the newly available AD8217, an easy-to-use,highly integrated zero-drift current sensor with an input common-mode voltage range of 4.5 V to 80 V. Configuring a Standard Op Amp for High-Side Current Sensing Figure 1 shows an op-amp-based discrete solution employing the AD8628.
MAX44286EVKIT Evaluation Kit for the MAX44286- Maxim Description Create a design and simulate using EE-Sim® tools: The MAX44286 evaluation kit(EV kit)provides a proven design to evaluate the MAX44286 zero-drift, high-side, current-sense amplifier that offers precision and low supply current.