Pacemaker with pulse width adjustment circuitry

DETAILED DESCRIPTION In accordance with one aspect of this invention, there is provided a circuit for stretching the pulse width of a pacing pulse to achieve constant output pulse energy as the power source decreases in voltage.
The system eliminates the need to use a voltage controlled oscillator which would inherently require use of a capacitor and cause the circuit to be inefficient from a current drain standpoint.
The pulse width stretching circuitry of the present invention utilizes a unique digital to analog converter not requiring use of a capacitor or a voltage controlled oscillator.
The circuit disclosed herein also eliminates the drift and trim problems which would arise through the use of a voltage controlled oscillator capacitor.