Proportional-integral-derivative (pid) analog controller and a method for testing a pid analog controller of a dc/dc converter

A Proportional-Integral-Derivative (PID) analog controller of a Direct Current (DC)/DC converter, the PID analog controller comprising:

• an operational transconductance amplifier (OTA);
• a feedback network connected to a terminal of the PID analog controller at which an output voltage of the DC/DC converter is received and to an output terminal of the OTA, wherein the feedback network comprises a first CMOS switch connected to the output terminal of the OTA, a second CMOS switch, an NMOS transistor connected to the first CMOS switch and to the terminal of the PID analog controller, and a pull-down transistor connected to the first CMOS switch and to the NMOS transistor;
• and
• a capacitor connected to the OTA through the second CMOS switch and to the terminal of PID analog controller.

A method for testing a Proportional-Integral-Derivative (PID) analog controller of a buck Direct Current (DC)/DC converter, the method comprising:

• setting an analog regulation loop, which is formed by an operational transconductance amplifier (OTA) of the PID analog controller and a feedback network of the PID analog controller, to a stable condition and testing a DC parameter of the PID analog controller, the setting comprising:
• closing a first CMOS switch of the feedback network to electrically connect a gate terminal of an NMOS transistor of the feedback network to an output terminal of the OTA;
• and
• opening a second CMOS switch of the feedback network that is connected to a capacitor that is connected between a terminal of the PID analog controller at which an output voltage of the DC/DC converter is received and to a first input terminal of the OTA to electrically disconnect the capacitor from the feedback network, wherein a source terminal of the NMOS transistor is connected to the terminal of the PID analog controller and a drain terminal of the NMOS transistor is connected to a supply voltage;
• and
• setting the analog regulation loop to an unstable condition and testing an Alternate Current (AC) parameter of the PID analog controller, the setting comprising closing the second CMOS switch of the feedback network to electrically connect the capacitor to the feedback network.