Current-mode sinusoidal oscillator using single current amplifier

A current driver for biomedical stimulation, comprising:

• a DC current source;
• a switch connected to the DC current source, wherein the switch is configured to one of connect and disconnect the DC current;
• a current amplifier having a current input terminal x connected to the switch, a first negative current feedback terminal Ifo1, a second negative current feedback terminal Ifo2, a positive current output terminal Iop and a negative current output terminal Ion;
• a first feedback path connected between the negative current feedback terminal Ifo1 and the input terminal x, wherein the first feedback path is configured to transmit a portion of a current at the first negative current feedback terminal Ifo1 to the current input terminal X;
• a second feedback path connected between the second negative current feedback terminal Ifo2 and the input terminal x, wherein the second feedback path is a three stage phase lag network configured to shift the phase of the current in the second feedback path by a negative 180 degrees at a frequency of oscillation with respect to the input current;
• and
• a biomedical load connected between the positive current output terminal Iop and the negative current output terminal Ion, wherein an output current driven through the biomedical load is sinusoidal.

A method for providing biomedical stimulation, comprising:

• connecting a DC current source to an input terminal of a current mode sinusoidal oscillator;
• switching, by a switch connected to the DC current source, the DC current source ON;
• wherein the current mode sinusoidal oscillator includes a current amplifier having a current input terminal X connected to the switch, a first negative current feedback terminal Ifo1, a second negative current feedback terminal Ifo2, a positive current output terminal Iop and a negative current output terminal Ion;
• connecting a first feedback path between the first negative current feedback terminal Ifo1 and the input terminal X, and transmitting a portion of a current at the first negative current feedback terminal Ifo1 to the current input terminal X;
• connecting a second feedback path between the second negative current feedback terminal Ifo2 and the input terminal X, wherein the second feedback path is a three stage phase lag network configured to shift the phase of the current in the second feedback path by a negative 180 degrees with respect to the input current at a frequency of oscillation;
• connecting a biomedical load between the positive current output terminal Iop and the negative current output terminal Ion;
• and
• driving a sinusoidal output current through the biomedical load.