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DC/DC converters are widely used to produce various power supply voltages required for various electronic components on a board. Though DC/DC converter is more efficient than the linear regulator is, however, the switching noise becomes larger with the increase of the switching frequency. In particular, ringing noises at the sharp rising edge of the switching waveform generated by the effect of the...
With the fast development of modern power semiconductors in the last years, the development of current measurement technologies has to adapt to this evolution. The challenge for the power electronic engineer is to provide a current sensor with a high bandwidth and a high immunity against external interferences. Rogowski current transducers are popular for monitoring transient currents in power electronic...
Compared to conventional current sensors, the proposed topology is advantageous because of its high resolution throughout its full measurement range, thus reducing offsets to a minimum. This aim is reached through active offset compensation using an analog/digital chopper/de-chopper. A further advantage is the excellent suppression of 1/f noise and a low noise density (35 nV/√Hz) down to the DC-threshold...
Electrical transport measurements performed in polyacene thin films as a function of the applied voltage, pointed out the existence of a sharp peak in the relative spectral density of current noise occurring at voltages corresponding to the region of crossover between the Ohmic regime and the space charge limited current regime. Recently we have proposed an explanation of these experimental findings...
A chopper ripple-free circuit with input noise density of 37 nV/√Hz is presented. The CMOS scheme chops the input and demodulates the result after amplification with CDS. Offset temperature dependence is better than 0.03 μV/°C. The analog current consumption is 12.8 μA with supplies ranging from 1.8 V to 5 V. The noise efficiency factor is 5.5.
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
A circuit for on-chip measurement of long-term jitter, period jitter, and clock skew, is demonstrated. The circuit uses a single latch and a voltage-controlled delay element, and is evaluated in a stand-alone pad frame. Excellent reproduction of jitter measured by oscilloscope is shown. Measured jitter resolution is 1 ps or better. The circuit is also incorporated into a 2 GHz clock distribution network...
This paper presents an experimental method that can be used to determine the cyclostationary properties of the low-frequency noise of bipolar transistors and diodes. The noise is measured while the device works in nonlinear regime, pumped by a low-noise signal source. To measure the noise around carrier (as close as 1 Hz offset from the carrier), bridge circuits are used to balance the pump out. By...
This paper is concerned with the 1/f noise characteristics of a new sub-threshold device configuration, the Schottky junction transistor (SJT). Results from 2 mum gate length SJTs confirm the expected sub-threshold d.c. behavior. Room temperature measurements of the drain current noise power spectrum and the gate referred noise power spectrum are presented. Although still not optimized the prototype...
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