Patent ID: 9608585
Date: 2017-03-28
CPC Classifications: H03G,H03M

Claim:
1. A zero-crossing amplifier unit for use in high speed analog-digital-converters, comprising: a gain stage for comparing a sampling voltage at an input node of the zero-crossing amplifier unit with a provided threshold voltage to obtain a gain stage output signal, wherein the gain stage comprises a first clock transistor and a first transistor connected in series and the input node of the zero-crossing amplifier unit is connected by a feedback capacitor to an output node of the zero-crossing amplifier unit; a voltage controlled current source that provides a controlled output current depending on a time window between an initial slope and an end slope of the gain stage output signal, wherein the voltage controlled current source comprises a second transistor; and a slope control circuit to increase a duration of a rise and/or fall time of at least one of the initial slope and the end slope of the gain stage output signal, wherein a gate of the second transistor is connected to a current control signal of the slope control circuit.