Patent ID: 9246440
Filing Date: 2016-01-26
CPC Classification: H03F

Claim Text:
1. An amplifier, comprising a pair of switching transistors, each switching transistor being driven complementarily; a pair of load resistors, each load resistor being connected in series to one of the switching transistors; a pair of cascade transistors, each cascade transistor being between one of the load resistors and one of the switching transistors; and a bias control configured to provide a base level of the cascade transistors, the base level being higher than an output LOW level of the cascade transistors by an offset amount to provide a discharge current of the switching transistors from the bias control, wherein the bias control includes a first current source, a second current source and a resistor, the first current source being connected in series to the resistor and providing a current corresponding to a maximum current flowing in the load resistors, the resistor having a resistance corresponding to the resistance of the load resistors, the second current source being connected in parallel to the resistor to reduce a current flowing in the resistor by a preset amount, and wherein the offset amount of the base level is determined by the current provided from the second current source in the bias control multiplied by the resistance of the resistor in the bias control.