Active Diode Circuit

A current source comprising:

• an active diode circuit, the active diode circuit comprising:
• an active diode, the active diode comprising an anode terminal, a cathode terminal a control terminal, a first MOSFET of a first conductivity type, and a second MOSFET of the first conductivity type, wherein a source of the first MOSFET and a source of the second MOSFET are connected to form one of the anode terminal and cathode terminal of the active diode, a gate and a drain of the first MOSFET are connected to a gate of the second MOSFET, a source and a drain of the second MOSFET form the other one of the anode terminal and cathode terminal of the active diode, and the gate of the first MOSFET forms the control terminal of the active diode, and
• a control circuit configured to generate a control current of the active diode on the control terminal proportional to a diode current of the active diode, and to control the diode voltage of the active diode below a first predetermined threshold, wherein the control circuit comprises:
• a current mirror circuit connected across the anode terminal or cathode terminal and the control terminal to generate a control current of the active diode on the control terminal proportional to the diode current of the active diode, and
• a third MOSFET of the first conductivity type, wherein a body of the third MOSFET is connected to the one of the anode terminal and cathode terminal of the active diode and a source of the third MOSFET is connected to the other of the anode terminal and cathode terminal of the active diode.

A current sink comprising:

• an active diode circuit, the active diode circuit comprising:
• an active diode, the active diode comprising an anode terminal, a cathode terminal a control terminal, a first MOSFET of a first conductivity type, and a second MOSFET of the first conductivity type, wherein a source of the first MOSFET and a source of the second MOSFET are connected to form one of the anode terminal and cathode terminal of the active diode, a gate and a drain of the first MOSFET are connected to a gate of the second MOSFET, a source and a drain of the second MOSFET form the other one of the anode terminal and cathode terminal of the active diode, and the gate of the first MOSFET forms the control terminal of the active diode, and
• a control circuit configured to generate a control current of the active diode on the control terminal proportional to a diode current of the active diode, and to control the diode voltage of the active diode below a first predetermined threshold, wherein the control circuit comprises:
• a current mirror circuit connected across the anode terminal or cathode terminal and the control terminal to generate a control current of the active diode on the control terminal proportional to the diode current of the active diode, and
• a third MOSFET of the first conductivity type, wherein a body of the third MOSFET is connected to the one of the anode terminal and cathode terminal of the active diode and a source of the third MOSFET is connected to the other of the anode terminal and cathode terminal of the active diode.