Aerosol generating device and method of operating the same

An aerosol generating device comprising:

• a vibrator configured to vibrate at different vibration speeds according to a frequency of a supply voltage to generate an aerosol from an aerosol generating material;
• a feedback circuit configured to detect an electrical signal representing a frequency response of the vibrator that changes according to an operating environment of the vibrator, and output a feedback signal based on the detected electrical signal;
• a controller configured to adjust, in response to a change in the frequency response of the vibrator, the frequency of the supply voltage based on the feedback signal such that the vibrator vibrates at a target vibration speed to generate the aerosol from the aerosol generating material;
• a battery;
• a converter configured to convert a first direct current (DC) voltage supplied from the battery to a second DC voltage;
• and
• a transistor configured to generate the supply voltage for the vibrator by performing an on-off operation on the second DC voltage according to a frequency of a pulse width modulation (PWM) signal output from the controller,
• wherein the feedback circuit includes a first connection terminal connected to the converter and a second connection terminal connected to the transistor, and outputs a voltage proportional to a voltage difference between the first connection terminal and the second connection terminal as the electrical signal.