Zero-Drift Amplifiers: Now easy to use in high precision circuits
نویسنده
چکیده
A zero-drift amplifier, as the name suggests, is an amplifier with offset voltage drift very close to zero. It uses auto-zero or chopping technology, or a combination of both, to continuously self-correct for DC errors over time and temperature. This enables the amplifier to achieve microvolt-level offsets and extremely low offset drifts. Therefore, it is uniquely suited to be used in signal conditioning circuits with high gain and precision performance. For example, a sensor (temperature, pressure, load cell, etc.) typically produces a low-level output voltage and hence requires an amplifier to amplify its output without introducing additional errors. Zero-drift amplifiers, designed for ultralow offset voltage and drift, high common-mode rejection, high power supply rejection and reduced 1/f noise, are an ideal choice to achieve a high level of resolution in a demanding system application, such as signal sensing and conditioning, with a long product life cycle.
منابع مشابه
Analog Dialogue 49-07, July 2015
A zero-drift amplifier, as the name suggests, is an amplifier with offset voltage drift very close to zero. It uses autozero or chopping technology, or a combination of both, to continuously self-correct for dc errors over time and temperature. This enables the amplifier to achieve microvoltlevel offsets and extremely low offset drifts. Therefore, it is uniquely suited to be used in signal cond...
متن کاملAN-79 IC Preamplifier Challenges Choppers on Drift (Rev. B)
Since the introduction of monolithic IC amplifiers there has been a continual improvement in DC accuracy. Bias currents have been decreased by 5 orders of magnitude over the past 5 years. Low offset voltage drift is also necessary in a high accuracy circuits. This is evidenced by the popularity of low drift amplifier types as well as the requests for selected low-drift op amps. However, until n...
متن کاملApplication Note 79 IC Preamplifier Challenges Choppers on Drift
Since the introduction of monolithic IC amplifiers there has been a continual improvement in DC accuracy. Bias currents have been decreased by 5 orders of magnitude over the past 5 years. Low offset voltage drift is also necessary in a high accuracy circuits. This is evidenced by the popularity of low drift amplifier types as well as the requests for selected low-drift op amps. However, until n...
متن کامل18.6 A 12b 75MS/s Pipelined ADC using Open-Loop Residue Amplification
Conventional pipelined ADCs use electronic feedback to achieve highly linear and drift insensitive transfer characteristics in their interstage gain elements. Especially in the converter frontend, amplifiers with large open-loop gain are needed to achieve the desired accuracy. Due to additional, conflicting low noise and high bandwidth requirements, precision amplifiers dominate the power dissi...
متن کاملHigh-accuracy Pipelined A/D Converter Based on Zero-crossing Switched Capacitor Circuits
Technology scaling poses challenges in designing analog circuits because of the decrease in intrinsic gain and reduced swing. An alternative to using highgain amplifiers in the implementation of switchedcapacitor circuits has been proposed [1] that replaces the amplifier with a current source and a comparator. The new comparatorbased switchedcapacitor (CBSC) technique has been implemented in tw...
متن کامل