Switch-mode amplifier

A device, comprising:

• an amplifier having a first path and a second path, the first path having a first amplifier and the second path having a second amplifier;
• a resistive switch having a first terminal connected to the second path;
• and
• a controller configured to set the resistive switch to a first state when a power input of the amplifier is below a threshold and to a second state when the power input of the amplifier is above the threshold.

A controller, comprising:

• an input configured to receive a digital input signal, the digital input signal being configured for transmission by a multiple-path amplifier, the multiple-path amplifier including a resistive switch configured to receive a control signal to set a resistance of the resistive switch to first or second resistance states, the resistive switch inhibiting operation of an amplifier in the multiple-path amplifier when in the first resistance state and allowing operation of the amplifier in the multiple-path amplifier when in the second resistance state;
• a register configured to store a threshold;
• a comparator configured to:
• compare the digital input signal to the threshold,
• when the digital input signal is less than the threshold, generate a first output signal configured to cause the resistive switch to have the first resistance value, and
• when the digital input signal is greater than the threshold, generate a second output signal configured to cause the resistive switch to have the second resistance value.