Patent ID: 7932780
Filing Date: 2011-04-26
Classification: H03F

Abstract:
1. A Voltage Enhancement Circuitry (VEC) for amplifiers, suitable of being implemented as an Integrated Circuit (IC), comprising: a) a push-pull stage for enhancing the output voltage of said VEC upon demand and for supplying an extra current needed by said amplifier during an enhancement period that is controlled via an input control signal; b) a VEC driver having a low output resistance (Rdson) while being in its inactive mode and a linearly increasing resistance which is changing linearly with said input control signal, while entering into its active mode, above a determined threshold; c) IC contacts for connecting a feedback circuitry between the output stage of said VEC and an input of said VEC; d) the feedback circuitry, being external to said IC, for generating a feedback signal from said output voltage to an input of said VEC driver, for sensing changes in said output voltage; e) a threshold programming module, for externally programming and determining a threshold level for said input control signal, above which enhancement is provided for shaping the amplified video envelope of said output voltage; f) an I-Boost module for sampling the current of said input control signal and for amplifying said current up to a pre-defined level; and g) a current controlled bias circuit for shifting, whenever required, the bias of said push-pull stage.