Single-Stage Op-Amp Class-AB Slew Enhancement With Dynamic Bias

The patent implements dynamic bias voltage control where the bias voltage is adjusted in real-time based on the input signal amplitude. When the input signal amplitude increases, the bias voltage increases accordingly, which dynamically increases the tail current and thereby enhances the slew rate. This dynamic adjustment allows the amplifier to maintain high linearity during large signal swings while preserving the high bandwidth and low noise characteristics of the single-stage architecture during small signal operation.

The patent employs dynamic bias voltage control that adjusts the tail current based on the input signal amplitude. During small signal operation, the bias voltage remains at a low level, resulting in reduced quiescent current consumption. When large signal swings occur, the bias voltage increases to provide sufficient slew rate. This dynamic adjustment strategy allows the amplifier to achieve high bandwidth and low noise performance while significantly reducing average power consumption compared to traditional single-stage amplifiers that require high fixed bias currents.

The patent implements a dynamic bias voltage control mechanism where the bias voltage is modulated according to the instantaneous amplitude of the input signal. The control circuit monitors the input signal and adjusts the bias voltage proportionally - higher input amplitudes result in higher bias voltages and consequently higher tail currents that provide the necessary slew rate. During low-amplitude or idle conditions, the bias voltage is reduced to minimize quiescent current consumption. This dynamic approach eliminates the need for high fixed bias currents while maintaining adequate slew rate performance.