A method of operating a programmable logic device includes the steps of using a full VDD supply voltage to operate a first set of active blocks of the programmable logic device, and using a reduced supply voltage to operate a second set of active blocks of the programmable logic device. The flexural springs extend in succession along substantially the whole periphery of the load platform in a gap between the load platform and the inner edge of the frame, and an attachment spot on the load platform for every flexural spring is arranged substantially directly opposite or past an attachment spot on the inner edge of the frame for a next flexural spring in the succession of springs. A WLAN terminal initiates a tunnel establishment request in an Internet Key Exchange Security Association that has been established. The amplitude of the signal is attenuated by frequency selective attenuation means during the direct voltage reduction by the compensation means.