Time filter

Source Type

Leuven, Belgium

Cornelissens K.,Catholic University of Leuven | Steyaert M.,ESAT MICAS
Analog Circuit Design - Robust Design, Sigma Delta Converters, RFID | Year: 2011

In comparator-based switched-capacitor circuits, OTAs are replaced by comparators and current sources. Instead of an OTA forcing a virtual ground condition, a comparator steers current sources until it detects a virtual ground. Different possibilities to use this principle in a ΔΣ A/D converter are evaluated. A pseudo-differential implementation with preset minimizes the requirements for the comparator and the current source. Due to the operation of the circuit, feed-back noise-shaping filters with half delay integrators are preferable. An implementation of a comparator-based switched-capacitor ΔΣ A/D converter in a 1 V, 90 nm CMOS technology demonstrates the feasibility. © 2011 Springer Science+Business Media B.V.

Ceperic V.,University of Zagreb | Gielen G.,ESAT MICAS | Baric A.,University of Zagreb
IEEE International Symposium on Electromagnetic Compatibility | Year: 2012

A concept of modelling electromagnetic immunity (EMI) of integrated circuits (IC) by using support vector machines (SVM) is presented. The problem of detecting, modelling and predicting failure of the integrated circuit operation due to the conducted electromagnetic interferences according to IEC 62132-4 standard is transformed into the classification problem solved by SVM. As a electronic circuit test case, the conducted EMI model of local interconnect network (LIN) interface circuit is presented. © 2012 IEEE.

Francois B.,ESAT MICAS | Reynaert P.,ESAT MICAS | Wiesbauer A.,Infineon Technologies | Singer P.,Infineon Technologies
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Microwave Conference, EuMC 2010 | Year: 2010

A switching mode RF power amplifier that employs a narrowband filter directly connected to the output, is presented. The efficiency improvement compared to a conventional class B PA and the influence of a transmission line between the PA and this filter is investigated. These techniques are illustrated by circuit simulation and verified by measurements. It is shown how the transmission line between the filter and the PA will influence both the efficiency and the distortion of the PA. © 2010 EuMA.

Van Breussegem T.,ESAT MICAS | Steyaert M.,ESAT MICAS
2010 IEEE 12th Workshop on Control and Modeling for Power Electronics, COMPEL 2010 | Year: 2010

This paper presents a fully integrated capacitive DC/DC-converter with a gearbox type topology. By merging multiple topologies the output voltage range is increased. The dual loop digital control improves load regulation compared with a conventional hysteretic control and reduces ripple under low load operation. The converter was implemented in a 90nm CMOS technology and measurements are presented.

Sarafianos A.,ESAT MICAS | Pichler J.,Infineon Technologies | Sandner C.,Infineon Technologies | Steyaert M.,ESAT MICAS
2015 IEEE Asian Solid-State Circuits Conference, A-SSCC 2015 - Proceedings | Year: 2015

This paper presents a fully integrated capacitive DC-DC converter with a wide input voltage range. The folding Dickson converter is used to implement four discrete voltage conversion ratios, capable of operating over a wide input voltage range. A subconverter is added, enabling four additional voltage conversion ratios, improving the input voltage resolution from Vout to 1/2 Vout. This way, the extra conversion ratios increase the overall efficiency, and at the same time reduce output ripple specifications. Implementing this additional converter at the end of the Dickson cascade reduces the complexity of driving the extra power train switches. This improved folding Dickson converter achieves an average efficiency above 70% at maximum output power, and operates over an input voltage range of 2.5-8V for an output voltage of 1.2V. The converter has been implemented and validated in a standard 90nm technology. © 2015 IEEE.

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