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Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
In chopper amplifiers, the interaction between the input signal and the chopper clock can cause intermodulation distortion (IMD). This is due to amplifier delay, which causes signal transitions generated by the input chopper to arrive at the amplifier's output slightly later than the corresponding clock transitions of the output chopper. This...
conference paper 2023
document
Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
In chopper amplifiers, the interaction between the input signal and the chopper clock can cause intermodulation distortion (IMD). This is mainly due to finite amplifier bandwidth, which causes signal-dependent output spikes at the chopping transitions. Such chopper-induced IMD can be mitigated by the fill-in technique, which involves ping...
journal article 2023
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Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
This article describes an auto-zero stabilized voltage buffer that achieves low offset and low noise with sub-pA input current. A high gain stabilization loop is used to periodically cancel the buffer’s offset. The loop itself is periodically disconnected from the buffer and auto-zeroed, during which its bandwidth is reduced to reduce the...
journal article 2022
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Rooijers, C.T. (author), Karmakar, S. (author), Kusuda, Yoshinori (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
Amplifiers often employ chopping to achieve low offset and low-frequency noise. However, the interaction between the input signal and the chopper clock can cause chopper-induced intermodulation distortion (IMD) [1] -[5]. This is especially problematic for input frequencies (Fin) near even multiples of the chopping frequency (FCH), as the...
conference paper 2021
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Rooijers, C.T. (author), Karmakar, S. (author), Kusuda, Y. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
In chopper amplifiers, the interaction between the input signal and the chopper clock can give rise to intermodulation distortion (IMD). This chopper-induced IMD is mainly due to amplifier delay, which causes large pulses at the output of the amplifier's output chopper. This article proposes the use of a so-called fill-in technique to eliminate...
journal article 2021
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Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
This paper presents an input-current trimming scheme for auto-zero amplifiers. Since their input current is mainly due to charge injection,the scheme operates by trimming the clock swing,and hence the charge injection,of two dummy input switches. At room temperature,the trimming scheme reduces the maximum input current of an auto-zero...
conference paper 2019
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Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
The readout of high-impedance sensors and sampled voltage references [1] requires amplifiers that can achieve both low offset and low input current. Recently, it has been shown that this unique combination can be achieved by an auto-zero (AZ) stabilized buffer [2]. However, its low-frequency noise density is surd 5 times higher than the...
conference paper 2019
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Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
The readout of high impedance sensors and sampled voltage references [1]<br/>requires amplifiers with both low offset and low input current. Chopper amplifiers<br/>can achieve low offset, but the switching of their input chopper gives rise to<br/>significant input current (40 to 110pA) [2-4]. Auto-zero (AZ) amplifiers require<br/>less input...
conference paper 2018
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Xu, L. (author), Heidary Shalmany, S. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
This letter presents the most accurate shunt-based high-side current sensor ever reported. It achieves a 25 V input common-mode range from a single 1.8-V supply by using a beyond-the-rails ADC. A hybrid analog/digital temperature compensation scheme is proposed to simplify the circuit implementation while maintaining the state-of-the-art...
journal article 2018
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Xu, L. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
This paper presents a fully integrated ±4A current sensor that supports a 25V input common-mode voltage range (CMVR) while operating from a single 1.5V supply. It consists of an on-chip metal shunt, a beyond-the-rails ADC [1] and a temperature-dependent voltage reference. The beyond-the-rails ADC facilitates high-side current sensing without...
conference paper 2018
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Xu, L. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
This paper presents a fully integrated shunt-based current sensor that supports a 25-V input common-mode range while operating from a single 1.5-V supply. It uses a highvoltage beyond-the-rails ADC to directly digitize the voltage across an on-chip shunt resistor. To compensate for the shunt’s large temperature coefficient of resistance (∼0.335%...
journal article 2018
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Aita, AL (author), Pertijs, M.A.P. (author), Makinwa, K.A.A. (author), Huijsing, J.H. (author), Meijer, G.C.M. (author)
In this paper, a low-power CMOS smart temperature sensor is presented. The temperature information extracted using substrate PNP transistors is digitized with a resolution of 0.03 °C using a precision switched-capacitor (SC) incremental<br/> A/D converter. After batch calibration, an inaccuracy of ±0.25 °C (±3σ ) from −70 °C to 130 °C is...
journal article 2013
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Wu, R. (author), Chae, Y. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
This paper presents a 20-b read-out IC with ±40-mV full-scale range that is intended for use with bridge transducers. It consists of a current-feedback instrumentation amplifier (CFIA) followed by a switched-capacitor incremental ΔΣ ADC. The CFIA's offset and 1/ <i>f</i> noise are mitigated by chopping, while its gain accuracy and gain drift are...
journal article 2012
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Pertijs, M.A.P. (author), Aita, AL (author), Makinwa, K.A.A. (author), Huijsing, J.H. (author)
Smart temperature sensors generally need to be trimmed to obtain measurement errors below ±2°C. The associated temperature calibration procedure is time consuming and therefore costly. This paper presents two, much faster, voltage calibration techniques. Both make use of the fact that a voltage proportional to absolute temperature (PTAT) can be...
journal article 2010
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Wu, R. (author), Makinwa, K.A.A. (author), Huijsing, J.H. (author)
This paper presents a chopper instrumentation amplifier for interfacing precision thermistor bridges. For high CMRR and DC gain, the amplifier employs a three-stage current-feedback topology with nested-Miller compensation. By chopping both the input and intermediate stages of the amplifier, a 1 mHz 1/f noise corner was achieved at an input...
journal article 2009
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Witte, J.F. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)
journal article 2008
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Pertijs, M.A.P. (author), Makinwa, K.A.A. (author), Huijsing, J.H. (author)
journal article 2005
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Pertijs, M.A.P. (author), Niederkorn, A. (author), McKillop, B. (author), Bakker, A. (author), Huijsing, J.H. (author)
journal article 2005
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Bajdechi, O. (author), Gielen, G.E. (author), Huijsing, J.H. (author)
journal article 2004
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Pertijs, M.A.P. (author), Meijer, G.C.M. (author), Huijsing, J.H. (author)
journal article 2004
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