Linear Amplitude Modulation System with Dynamic Bias Control

The patent applies dynamics by making the amplifier's bias current adjustable and time-varying rather than fixed. The bias current is dynamically controlled to match the instantaneous signal amplitude, allowing the amplifier to operate efficiently at low power levels while maintaining linearity when needed. This is achieved through a control system that adjusts the bias current based on the modulating signal envelope.

The patent changes the bias current parameter dynamically according to the signal requirements. Instead of maintaining a constant high bias current for all operating conditions, the system varies the bias current parameter to match the instantaneous amplitude demands, thereby improving power efficiency while preserving linearity when required by the modulation scheme.

The patent employs feedback control where the amplifier output is monitored and the bias current is adjusted accordingly. This feedback mechanism ensures that even when operating at lower power levels for improved efficiency, the amplifier maintains proper linearity by dynamically adjusting the bias to compensate for any non-linearities that would otherwise occur at reduced power levels.

By making the bias current dynamic rather than static, the system can operate at lower average power levels while maintaining linearity during peak signal conditions. The dynamic adjustment ensures that the amplifier transitions smoothly between operating points, preventing distortion even when operating below maximum power levels.

The patent applies periodic action by pulsing the bias current to match the periodic nature of communication signals. Instead of maintaining continuous high bias current, the system applies bias current in pulses synchronized with the signal envelope, providing linearity only when needed while minimizing average power dissipation during low-signal or idle periods.

The bias current parameter is changed dynamically to match signal requirements. During peak signal periods, the bias current increases to maintain linearity, while during low-power periods, the bias current decreases to reduce dissipation. This parameter modulation aligns power consumption with actual signal demands.