Abstract: A chopper amplifier and method of operation are described. The chopper amplifier comprises a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency. An amplification stage has an input arranged to receive the chopped signal and an output, and supplies an amplified signal at the output. An output chopper is arranged to integrate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal. The amplification stage is further configured to filter the chopped signal to attenuate signal components having frequencies lower than the chopper frequency.

Abstract: A chopper amplifier and method of operation are described. The chopper amplifier comprises a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency. An amplification stage has an input arranged to receive the chopped signal and an output, and supplies an amplified signal at the output. An output chopper is arranged to integrate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal. The amplification stage is further configured to filter the chopped signal to attenuate signal components having frequencies lower than the chopper frequency.

Abstract: The present invention relates to a synchronization circuit for an integrated amplifier provided with a bandwidth control in accordance to a bandwidth control signal, wherein said synchronization circuit comprises a control terminal for a control signal and rank selector means connected to an internal control signal and being configured to emboss said internal control signal to said control terminal, if said internal control signal has a higher rank in accordance to a predetermined ranking criteria in comparison to said control signal. Further, the present invention relates to a respective synchronization method for continuously communicating and synchronizing of a common control signal for multiple circuits. One preferred application of the invention is in temperature protection by a synchronized bandwidth control for multiple class-AB amplifiers by means of only one additional terminal pin per amplifier.

Abstract: The present invention relates to a synchronization circuit for an integrated amplifier provided with a bandwidth control in accordance to a bandwidth control signal, wherein said synchronization circuit comprises a control terminal for a control signal and rank selector means connected to an internal control signal and being configured to emboss said internal control signal to said control terminal, if said internal control signal has a higher rank in accordance to a predetermined ranking criteria in comparison to said control signal. Further, the present invention relates to a respective synchronization method for continuously communicating and synchronizing of a common control signal for multiple circuits. One preferred application of the invention is in temperature protection by a synchronized bandwidth control for multiple class-AB amplifiers by means of only one additional terminal pin per amplifier.

Abstract: A driver circuit of an image display apparatus comprises driver circuit with a class A/B push-pull stage (T3, T5). The driver circuit contains an n-type pull transistor (T3), an n-type control transistor (T2) with a main current channel terminal coupled to a control electrode of the pull transistor (T2) and a voltage source (V) applying a predetermined voltage over a series connection of the control electrode-main current channel terminals of the control transistor (T2) and the pull transistor (T3). The current from the control transistor (T2) flows to a p-type push transistor (T5) via a current mirror (T4, T5). An input transistor (T1) draws all of the current from the control transistor (T2) via a node (142) between the control transistor (T2) and the pull transistor (T3) to control the ratio between the currents through these transistors (T2, T3).