in combination with other circuit designs such as those that require a stable high voltage reference this description is presented with enough detail to provide an understanding of the present invention and to enable one of ordinary skill in the art to build a precision low drift closed loop voltage reference this detailed description should not be construed to encompass all necessary materials in circuit production or operation referring more particularly to the drawings fig1 illustrates a block diagram of a voltage reference circuit 100 in accordance with an embodiment of the present invention the voltage reference circuit 100 comprises an input voltage 102 a time varying input signal 104 an input filter 106 and output filter 108 a switching circuit 111 a voltage multiplier circuit 113 a voltage regulator 115 and a voltage output 117 in one embodiment the input voltage 102 comprises a standard constant voltage source in one embodiment the voltage source provides a constant u00b1 15 volts standard voltage sources have a five percent error therefore in certain embodiments the voltage provided is 15 u00b1 0 75 volts the input voltage 102 travels through the input filter 106 to attenuate or eliminate any initial noise or irregularities generated by the voltage source the filtered input voltage 102 and time varying input signal 104 are both received by the switching circuit 111 the switching circuit 111 generates an ac output based on these dc signals and sends it to the voltage multiplier circuit 113 a voltage multiplier circuit 113 is a passive circuit for example a collection of passive devices such as capacitors and diodes arranged to produce a multiple of the input voltage at the output.