Rainer Krenzke

Dialog Semiconductor | DIALOGSC · R&D, Power-Management IC Design

Circuits and methods to compensate leakage current of a LDO are disclosed. The compensation is achieved by a temperature dependent sink current generation, which has a nearly zero current consumption increase of about 50 nA at room temperature and starts sink current at temperatures about above 85 to 100 degrees Celsius, which is corresponding to a...

A receiver interface for automotive infrared rain-sensing application is described which uses multi-scale ΔΣ A/D conversion and digital closed-loop compensation to achieve a dynamic range from 1.5nA to 14mA. It compensates ambient current from 14mA down to 1μA within 56μsec and accommodates an infrared pulse within 32μsec. The receiver is designed...

Integrated contact-less angular measurement systems for high resolution requirement use magnetoresistive sensors and an analog and digital mixed-signal read-out and signal processing circuit as sensor interface. The presented interface circuit consists of two fully differential 2nd -order sigma-delta (ΣΔ) modulator ADC channels for sine and cosine...

This paper describes various high-voltage drive and I/O interfaces developed as building blocks typically used for drive and control ICs. The interfaces can be used at voltages of up to 40V. They are implemented as CMOS-only circuits in a 0.35-mum standard CMOS process using an additional high-voltage module. The presented interfaces include an out...

This paper describes a CMOS H-bridge driver developed as part of a system-on-chip solution. It is designed for H-bridges whose switch elements are comprised of N-channel MOSFET to drive DC-motors with up to 24-V supply. The circuit consists of two high side drivers, two low side drivers and a charge pump. The drivers' PWM operation frequency is up...

This paper describes an interface IC that maintains the recording car-crash conditions, processes the crash-accident data, and provides the interface between the sensors and microcontroller. The monolithic multichannel Analog-to-Digital Converter (ADC) has four regular channels to monitor a dual axes acceleration sensor, an LC-oscillator based comp...

We present a mixed-mode read-out ASIC for airbag applications. It performs amplification and signal conditioning from a silicon acceleration sensor. The input signal is voltage proportional to the sensitivity of the acceleration with a maximum range of 56mVpeak for a VDD of 5V. The output is analog rail-to-rail without dc-offset. The chip contains...