Design of a 32bit High Precision Sigma-delta Fractional Divider

The frequency synthesizer is the core component of the radio frequency front end in wireless communication. And the phase-locked frequency synthesizer realizes the signal output of different frequencies by changing the frequency division multiple of the frequency divider. Fractional phase-locked loop can make the frequency synthesizer have higher performance. In this paper, a 32-bit high precision sigma-delta fractional divider is designed in detail from two parts: the programmable divider and the sigma-delta modulator. Finally, the function of the divider is verified by simulation. The working frequency of the decimal divider is 3.55~9.8GHz, the frequency division ratio range is 1~4095, and the frequency accuracy is 0.0235Hz.