An s-domain model of an integrated FM continuous wave digital frequency synthesizer
A technology of frequency modulation continuous wave and frequency synthesizer, which is applied in the direction of automatic power control and electrical components, etc., can solve the problems of reduced integration of frequency modulation continuous wave digital frequency synthesizer, and achieve the effect of improving prediction accuracy
Inactive Publication Date: 2017-12-01
FUDAN UNIV
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However, the disadvantage of this frequency synthesizer is that an off-chip capacitor with a large capacitance must be used to achieve the above performance, which greatly reduces the integration level of the frequency modulation continuous wave digital frequency synthesizer
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[0039] With time-to-digital converter accuracy ∆ t res =20ps, F VCO =24GHz, loop bandwidth 100kHz, frequency division ratio N =8, crystal oscillator f ref = 48MHz, α=100kHz⁄(48MHz×2π), as an example to show how applying this model predicts frequency error and phase noise performance. Substituting (8) and (9) into equations, we get image 3 and Figure 4 . according to image 3 and Figure 4 , the predicted frequency error at this time is:
[0040]
[0041] Phase noise is 98dB at 1MHz.
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The invention belongs to the technical field of integrated circuit design modeling, particularly discloses an s-domain model of an integrated frequency-modulated continuous wave digital frequency synthesizer, and provides a frequency-based modeling method. By using an accumulator model, a pulse switch, a charge pump and an on-chip capacitor are modeled; through the combination of an analog integrator, an ideal sampler, a zero-order retainer, a quantizer and a differentiator, a digital frequency converter is modeled, so that the prediction accuracy of the model is greatly improved; a normalized gain module expression is deduced, so that the model can carry out accurate prediction only by virtue of the accuracy of time-to-digital converter, loop bandwidth and crystal frequency during frequency error and phase noise prediction. The s-domain model can accurately predict the frequency error of a frequency-modulated continuous wave produced by the frequency synthesizer, and the phase noise of dot frequency.
Description
technical field [0001] The invention belongs to the technical field of integrated circuit design and modeling, and in particular relates to an integrated FM continuous wave digital frequency synthesizer s domain model. The model can accurately predict the frequency error performance of the FM continuous wave generated by the frequency synthesizer and the phase noise performance of the generated point frequency. Background technique [0002] FM CW digital frequency synthesizer is currently the most advanced frequency synthesis architecture used to generate FM CW [1]. It only needs a low-frequency crystal oscillator, which can generate the current highest modulation bandwidth ( B m : 1.5GHz) and the longest modulation time ( T m : 10ms) Two kinds of FM continuous wave. However, the disadvantage of this frequency synthesizer is that an off-chip capacitor with a large capacitance must be used to achieve the above performance, which greatly reduces the integration level of ...
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IPC IPC(8): H03L7/18
Inventor 李巍胡诣哲
Owner FUDAN UNIV
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