Granted Patent B2

US 8,681,518 · App. 12/506,610 · Granted Mar 25, 2014

Abstract

Claims (40)

1. A rectifier circuit comprising:

a depletion mode semiconductor having an output connected to a rectified signal output node of the rectifier circuit;

a hot carrier semiconductor diode having a cathode connected to a source node of the depletion mode semiconductor and an anode connected to a gate node of the depletion mode semiconductor; and

an alternating current (AC) input node that is connected to the anode of the hot carrier semiconductor diode and the gate node of the depletion mode semiconductor and that is configured to receive an AC input signal,

wherein when a first half cycle of the AC input signal is applied to the AC input node, a voltage drop between the AC input node and the rectified signal output node comprises a sum of a diode forward biased voltage drop and a voltage drop due to a source to drain resistance of the depletion mode semiconductor.

2. The rectifier circuit according to claim 1 ,

wherein responsive to a first half cycle of the AC input signal, the hot carrier semiconductor diode is forward biased to cause an applied voltage at the source node of the depletion mode semiconductor and an applied voltage at the gate node of the depletion mode semiconductor to be slightly different, which forward biases the depletion mode semiconductor, and

wherein responsive to a second half cycle of the AC input signal, the hot carrier semiconductor diode is reverse biased to cause the source node of the depletion mode semiconductor to float relative to the gate node of the depletion mode semiconductor, which reverse biases the depletion mode semiconductor when the depletion mode semiconductor generates a rectified output signal through the rectified signal output node during at least the first half cycle of the AC input signal.

3. The rectifier circuit according to claim 1 , wherein the hot carrier semiconductor diode comprises a Schottky diode.

4. The rectifier circuit according to claim 1 , wherein the depletion mode semiconductor comprises a high electron mobility transistor (HEMT) that incorporates at least one heterojunction as a conducting channel.

5. The rectifier circuit according to claim 1 , wherein the hot carrier semiconductor diode comprises a silicon Schottky diode.

6. The rectifier circuit according to claim 1 ,

wherein the hot carrier semiconductor diode comprises a silicon Schottky diode, and the depletion mode semiconductor comprises a GaN high electron mobility transistor (HEMT).

7. A high-voltage, low-capacitance rectifier circuit, the rectifier circuit comprising:

a high-speed, high-voltage, normally-on field effect transistor (FET) connected to a rectified signal output node of the rectifier circuit; and

a high-speed, low-voltage diode having a cathode connected to a source node of the FET and an anode connected to both of a gate node of the FET and an alternating current (AC) input node that is operable to receive an AC input signal, wherein when a first half cycle of the AC input signal is applied to the AC input node, a voltage drop between the AC input node and the rectified signal output node comprises a sum of a diode forward biased voltage drop and a voltage drop due to a source to drain resistance of the FET.

8. The rectifier circuit according to claim 7 ,

wherein responsive to a first half cycle of the AC input signal, the diode is forward biased to cause an applied voltage at the source node of the FET and an applied voltage at the gate node of the FET to be slightly different, which causes the FET to saturate, and

wherein responsive to a second half cycle of the AC input signal, the diode is reverse biased to cause the source node of the FET to float relative to the gate node of the FET, which reverse biases the FET to cause the FET to generate a rectified output signal through the rectified signal output node during at least the first half cycle of the AC input signal.

9. The rectifier circuit according to claim 7 , wherein the diode comprises a Schottky diode.

10. The rectifier circuit according to claim 7 , wherein the FET comprises a high electron mobility transistor (HEMT) that incorporates at least one heterojunction as a conducting channel.

11. The rectifier circuit according to claim 7 , wherein the diode comprises a silicon Schottky diode, and the FET comprises a GaN high electron mobility transistor (HEMT) formed on a SiC substrate.

12. The rectifier circuit according to claim 7 , wherein a diode forward biased voltage drop is about 0.4V.

13. The rectifier circuit according to claim 7 , wherein a voltage to current correspondence of the rectifier circuit is substantially linear responsive to an applied voltage exceeding a diode forward biased voltage drop.

14. A high-voltage, low-capacitance rectifier circuit, the rectifier circuit comprising:

a high-speed, high-voltage, normally-on field effect transistor (FET) connected to a rectified signal output node of the rectifier circuit, wherein the FET comprises a GaN high electron mobility transistor (HEMT) formed on a SiC substrate; and

a high-speed, low-voltage diode having a cathode connected to a source node of the FET and an anode connected to both of a gate node of the FET and an alternating current (AC) input node that is operable to receive an AC input signal,

wherein the diode comprises a silicon Schottky diode, and

wherein when a first half cycle of the AC input signal is applied to the AC input node, a voltage drop between the AC input node and the rectified signal output node comprises a sum of a Schottky diode forward biased voltage drop and a voltage drop due to a source to drain resistance of the GaN HEMT.

15. A rectifier circuit comprising:

a depletion mode semiconductor having an output connected to a rectified signal output node of the rectifier circuit;

a hot carrier semiconductor diode having a cathode connected to a source node of the depletion mode semiconductor and an anode connected to a gate node of the depletion mode semiconductor; and

an alternating current (AC) input node that is connected to the anode of the hot carrier semiconductor diode and the gate node of the depletion mode semiconductor and that is configured to receive an AC input signal,

wherein the depletion mode semiconductor comprises a GaN high electron mobility transistor (HEMT) formed on a SiC substrate, and

wherein responsive to a second half cycle of the AC input signal, the hot carrier semiconductor diode is reverse biased to cause the source node of the depletion mode semiconductor to float relative to the gate node of the depletion mode semiconductor, which reverse biases the depletion mode semiconductor when the depletion mode semiconductor generates a rectified output signal through the rectified signal output node during at least the first half cycle of the AC input signal.

16. A high-voltage, low-capacitance rectifier circuit, the rectifier circuit comprising:

a high-speed, high-voltage, normally-on field effect transistor (FET) connected to a rectified signal output node of the rectifier circuit; and

a high-speed, low-voltage diode having a cathode connected to a source node of the FET and an anode connected to both of a gate node of the FET and an alternating current (AC) input node that is operable to receive an AC input signal,

wherein the FET comprises a GaN high electron mobility transistor (HEMT) formed on a SiC substrate, and

wherein responsive to a second half cycle of the AC input signal, the diode is reverse biased to cause the source node of the FET to float relative to the gate node of the FET, which reverse biases the FET to cause the FET to generate a rectified output signal through the rectified signal output node during at least the first half cycle of the AC input signal.

Assignments (8)