Switching slew rate control of cascode switch device and gate driver thereof

A power switch device, comprising:

• a first transistor having a first source, a first drain and a first gate;
• and
• a second transistor having a second source, a second drain and a second gate;
• a gate driver configured to provide a gate driver signal to the first gate of the first transistor to control a switching slew rate of a voltage at the first drain of the first transistor;
• wherein the gate driver comprises:
• a first driver configured to provide a driver signal with a first driving capability to the control terminal of the second transistor;
• and
• a second driver configured to provide a driver signal with a second driving capability different from the first driving capability to the control terminal of the second transistor;
• wherein the first transistor is turned on or turned off in response to the gate driver signal.

A gate driver for driving a cascode switch device having a normally-on switch device and a normally-off switch device, wherein the gate driver comprises:

• a driver circuit configured to provide a gate driver signal to a control terminal of the normally-on switch device and a control terminal of the normally-off switch device to control a switching slew rate of a voltage at a first terminal of the normally-on switch device;
• wherein the driver circuit comprises:
• a first driver configured to provide a driver signal with a first driving capability to the control terminal of the normally-off switch device;
• and
• a second driver configured to provide a driver signal with a second driving capability different from the first driving capability to the control terminal of the normally-off switch device;
• wherein the normally-on switch device is turned on or turned off in response to the gate driver signal.