Patent ID: 7834592

Claim:
A circuit, comprising: a pulse transformer having primary and secondary windings, the primary winding having first and second terminals and a center terminal to which is coupled a DC source node, the secondary winding having third and fourth terminals; a first transistor coupled between the second terminal of the primary winding and a ground node; a first and a second resistor forming a voltage divider between the first terminal of the primary winding and the ground node, the voltage divider having a tap node coupled to a base junction of the first transistor; a second transistor in series with a third resistor coupled between the third and fourth terminals of the secondary winding and the ground node; and an R-C network formed by a fourth and a fifth resistor and a capacitor, the R-C network coupled to a base junction of the second transistor to cause a slow, tapered linear pinch off of the second transistor's conductance to enable the circuit to output a triangular waveform, the R-C network coupled to the third and fourth terminals of the secondary winding via a first and a second diode, respectively.