Implantable cardioverter defibrillator (ICD), subcutaneous implantable cardioverter defibrillator (SICD), and waveform energy control systems

A waveform energy control system for treating a cardiac condition in a patient, which comprises:

• a microcontroller;
• a digital-to-analog converter (DAC);
• and
• differentially driven amplifier circuits having an input and an output,
• wherein the microcontroller is operatively connected to the DAC, the DAC is operatively connected to the input of the differentially driven amplifier circuits, the microcontroller is configured to respond to software commands to generate signals to the DAC, the DAC provides signals to the input of the differentially driven amplifier circuits, and the output of the differentially driven amplifier circuits delivers constant current, constant voltage, or constant energy ascending arbitrary waveforms, biphasic truncated exponential (BTE) waveforms, or ascending arbitrary and BTE waveforms for pacing, anti-tachycardia pacing (ATP), low-voltage therapy, defibrillation, or cardioversion electrical shocks to the patient's heart.