Search results | TU Delft Repositories

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A Chopper-Stabilized Amplifier with a Relaxed Fill-In Technique and 22.6pA Input Current

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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An Auto-Zero-Stabilized Voltage Buffer With a Quiet Chopping Scheme and Constant Sub-pA Input Current

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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A Fill-In Technique for Robust IMD Suppression in Chopper Amplifiers

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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A ± 12-A High-Side Current Sensor With 25 V Input CM Range and 0.35% Gain Error From −40 °C to 85 °C

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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A ±4-A High-Side Current Sensor With 0.9% Gain Error From −40 °C to 85 °C Using an Analog Temperature Compensation Technique

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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Low-Power CMOS Smart Temperature Sensor With a Batch-Calibrated Inaccuracy of ±0.25 °C (±3σ) from −70 °C to 130 °C

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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A 20-bit ±40-mV Range Read-Out IC With 50-nV Offset and 0.04% Gain Error for Bridge Transducers

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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Low cost calibration techniques for smart temperature sensors

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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A chopper current-feedback instrumentation amplifier with a 1 mHz 1/f noise corner and an AC-coupled ripple reduction loop

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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A Current-Feedback Instrumentation Amplifier With 5 µV Offset for Bidirectional High-Side Current-Sensing

Witte, J.F. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)

journal article 2008

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A CMOS smart temperature sensor with a 3σ inaccuracy of ±0.1 °C from -55 °C to 125 °C

Pertijs, M.A.P. (author), Makinwa, K.A.A. (author), Huijsing, J.H. (author)

journal article 2005

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A CMOS smart temperature sensor with a 3 sigm Inaccuracy of +-0.5 deg C from -50 deg C to 120 deg C

Pertijs, M.A.P. (author), Niederkorn, A. (author), McKillop, B. (author), Bakker, A. (author), Huijsing, J.H. (author)