McClure, Qualey & Rodack, LLP
Amplifier, fully-differential amplifier and delta-sigma modulator
An amplifier, a fully-differential amplifier and a delta-sigma modulator are disclosed. The disclosed amplifier includes a front-end gain stage, an AC-coupled push-pull output stage and a compensation circuit. The compensation circuit is coupled between the front-end gain stage and an output terminal of the amplifier. The AC-coupled push-pull output stage uses an AC-coupled capacitor (which is a passive two terminal electrical component rather than a stray or parasitic capacitance of a transistor) to couple the front-end gain stage to a gate of a top or bottom transistor of a push-pull structure introduced in the AC-coupled push-pull output stage, and uses a resistance component to couple a gate of the top or bottom transistor (depending on which one is coupled to the AC-coupled capacitor) to a bias voltage level.
Mediatek Inc.
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Hung-Chieh Chen-Yen Yu-Hsin Chi-Lun
Tsai Ho Lin Lo