Apparatus and associated method
A semiconductor arrangement comprising; a normally-on transistor having first and second main terminals and a control terminal, a normally-off transistor having first and second main terminals and a control terminal, the transistors connected in a cascode arrangement by a connection between one of the main terminals of the normally-on transistor and one of the main terminals of the normally-off transistor, a current-source arrangement connected to a node on the connection and configured to provide for control of the voltage at said node between the normally-on and normally-off transistors by providing for a predetermined current flow, wherein the semiconductor arrangement comprises a first semiconductor die of III-V semiconductor type having the normally-on transistor formed therein and a second semiconductor die having the normally-off transistor formed therein, the current-source arrangement formed in the first and/or second semiconductor dies.
1. A semiconductor arrangement comprising;
a normally-on transistor having a first main terminal, a second main terminal, and a control terminal,
a normally-off transistor having a first main terminal, a second main terminal, and a control terminal,
the normally-on transistor and the normally-off transistor connected in a cascode arrangement by a connection between one of the first main terminal and the second main terminal of the normally-on transistor and one of the first main terminal and the second main terminal of the normally-off transistor,
a current-source arrangement connected to a node on the connection and configured to provide for control of the voltage at the node between the normally-on and normally-off transistors by providing for a predetermined current flow, wherein the current-source arrangement comprises:
a first transistor having a drain, a source and a gate;
a second transistor having a drain, a source and a gate;
the source of the first transistor connected to the drain of the second transistor;
the source of the first transistor connected to gate of the first transistor; and
the source of the second transistor connected to the gate of the second transistor through a resistor element,
wherein the node is connected to the drain of the first transistor, and
wherein the semiconductor arrangement comprises a first semiconductor die of III-V semiconductor type having the normally-on transistor formed therein and a second semiconductor die having the normally-off transistor formed therein, the current-source arrangement formed in the one or both of the first semiconductor die and the second semiconductor die.
2. The semiconductor arrangement of claim 1 , wherein the first transistor and the second transistor are formed in the first semiconductor die.
3. The semiconductor arrangement of claim 1 or claim 2 , wherein the resistor element is formed in first semiconductor die.
4. The semiconductor arrangement of claim 3 , wherein the resistor element comprises a track formed in a two dimensional electron gas region of the first semiconductor die.
5. The semiconductor arrangement of claim 2 , wherein the resistor element is formed in the second semiconductor die.
6. The semiconductor arrangement of claim 2 , wherein the one or both of the first transistor and the second transistor are HEMTs.
7. The semiconductor arrangement of claim 1 , wherein the normally-on transistor is selected from a high-electron-mobility transistor (HEMT) and a power transistor.
8. The semiconductor arrangement of 1 , wherein the normally-off transistor is selected from a MOS transistor and a LVMOS transistor.
9. The semiconductor arrangement of claim 1 , wherein the first semiconductor die is selected from the group of: Gallium Nitride, Gallium Arsenide, Indium Phosphide, Aluminum Nitride, Indium Gallium Nitride, and Gallium Oxide (Ga 2 O 3 ).
10. The semiconductor arrangement of claim 1 , wherein the second semiconductor die is selected from the group of: Silicon, Silicon Germanium (SiGe), and Silicon Carbide (SiC).
11. The semiconductor arrangement of claim 10 , wherein the current-source is configured to provide a current flow of between 0.1 and 10 μA and the normally-off transistor has a breakdown voltage of less than 40 V.
12. A semiconductor package including the semiconductor arrangement of claim 1 .
13. An electronic device including the semiconductor arrangement of claim 1 .
14. A method comprising;
driving a normally-on transistor with a normally-off transistor, the normally-on transistor and the normally-off transistor connected in a cascode arrangement by a connection between one of a first main terminal and a second main terminal of the normally-on transistor and one of first main terminal and the second main terminal of the normally-off transistor,
providing for a predetermined, fixed, current flow from a node on the connection by a current-source arrangement connected to the node and configured to provide for control of the voltage at the node, wherein the current-source arrangement comprises:
a first transistor having a drain, a source and a gate;
a second transistor having a drain, a source and a gate;
the source of the first transistor connected to the drain of the second transistor;
the source of the first transistor connected to gate of the first transistor; and
the source of the second transistor connected to the gate of the second transistor through a resistor element,
wherein the node is connected to the drain of the first transistor, and
wherein the normally-on transistor is formed in a first semiconductor die of III-V semiconductor type and the normally-off transistor is formed in a second, different, semiconductor die, the current-source arrangement formed in one or both of the first semiconductor die and the second semiconductor die.