Temperature compensated, low EMI relaxation oscillator

This paper proposes a method to minimize the EMI by irregularly converting the frequency of the Relaxation Oscillator through the frequency hopping circuit. In addition, the effect of applying this technique to the DC-DC converter and the effect of this result on the RF transceiver system have been studied in terms of noise. The main frequency of the proposed Relaxation Oscillator is 7.9 MHz to operate it and add temperature compensation block to be applied to the frequency compensation in response to temperature changes. The DC-DC Converter spurious tone is reduced up to 20 dB through changing frequency randomly. It is fabricated in 0.18 μm CMOS technology. The active area occupies an area of 220 μm × 280 μm. The supply voltage is 1.8 V and current consumption is 500 μΑ.