Andrei Danchiv

Protection Functions in Integrated Low Side Switches

This paper presents the over current and over temperature protective functions integrated in a low side switch. The design is focused on evaluating and controlling the over current and over temperature thresholds value spreads, to assure the needed accuracy. A simple analytical model is developed for predicting the threshold spreads. SPICE simulation, including Monte Carlo analysis, is used to get a better estimation for the two thresholds variation.

Charge injection induced sample and hold error analysis

This paper analysis the charge injection induced error in CMOS switched capacitor circuits. For this purpose, the basic S/H topology is used and an on-off transition model is considered, for both n and p channel switches. The transient error voltage behavior is presented. The final error value dependence on circuit parameters is analyzed and compared with simulation results.

Residual offset optimization for a continuous time autozero amplifier

In this paper, a continuous time autozero (AZ) amplifier topology is presented. To improve offset cancellation, a fully differential internal AZ loop is used. An analytical model is developed for estimating the residual offset during both operation phases; taking into account the main offset contributions: base and cancellation amplifiers offset voltages and respectively charge injection. The design considerations for achieving optimal residual offset are presented.

Power dissipation considerations in low side switch design

This paper presents a fully protected low side switch design from the thermal behavior perspective. The power dissipation is evaluated both for normal operation and for the main high power operation conditions: short circuit and overload, inductive clamping and turn on/off process. Electro-thermal simulations are used to evaluate the surface temperature, that is taken into account in designing the protection functions.

Five current steps topology for gate charging to improve EMC behaviour

This paper presents a topology to charge the gate of a high side power switch driver circuit. A new charge -discharge block which uses five constant current steps is proposed to improve the electromagnetic compatibility (EMC). This original circuit is compared with a driver based on a constant gate charge current by extended simulations.

Automotive high side power switch driver circuit

This paper presents a systematic design flow for a high side power switch driver circuit. The charge - discharge block is also, analyzed. Protection circuits to keep the power transistor switch in the safe operating area are implemented, simulated and tested.

Total transconductance optimization for a rail to rail amplifier

This paper presents a 0.6 mum CMOS constant transconductance rail to rail amplifier implementation. A single stage, folded cascode topology is used and an equivalent Zener diode controls the input pair transconductance by redistributing the bias current between the two complementary differential pairs. An analytical model is developed for the input transconductance versus common mode voltage dependence. The output resistance and total voltage gain variation are also presented. The results are checked by SPICE simulation.

Design Considerations and Residual Offset Analysisfor an Autozero Transconductance Amplifier Topology

This his paper presents a standard topology autozero transconductance (AZT) amplifier systematic design flow and performance analysis. This topology uses two differential pairs; one for the signal path and one for offset compensation. A standard 0.6 mum CMOS technology was used and the residual offset resulted about 17 muV

A new simplified model for charge injection induced sample and hold error

This paper introduces a new simplified model describing the charge injection induced error in sample and hold circuits. The proposed model has the advantage of a simpler analytical form then the exact model present in literature, while describing the error dependence on all important factors with good accuracy. We also present analytical constant error curves for different parameter combinations.

Supply concept in input powered two channel switch

This paper presents a supply concept for a two channel low side switch. The circuit is supplied from the input pins, each input supplying the corresponding channel. The topology presented in this paper selects the highest input voltage to supply common blocks. Simulations are used to observe the behavior of the switch.