Patent ID: 11949424
Assignee: SHENZHEN ZHONCENT TECHNOLOGIES CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A device for frequency calibration for voltage-controlled oscillators, comprising: a frequency divider connected with a voltage-controlled oscillator(VCO), a time-digital converter connected with the frequency divider, a logic controller connected with the time-digital converter, a digital-to-analog converter connected with the voltage-controlled oscillator; wherein:
the frequency divider is used to divide a signal generated by the voltage-controlled oscillator into N times to get a frequency division signal, where N is a positive integer;
the time-digital converter is used to measure a time difference of at least two continuous or discontinuous frequency division signals and obtain an actual time period of frequency division signal;
the logic controller is used to generate the control voltage according to the difference between the actual time period of the frequency division signal and a calibration period of the frequency division signal, and adjust a frequency of the VCO according to the control voltage;
a relationship between the control voltage and the actual time period of the frequency division signal is as follows:

Δy(k+1)=φ(k)Δu(k)

wherein u(k) is the control voltage, y(k+1) is a period of the generated frequency division signal at a k+1-th time instant, φ(k) is a time-varying parameter at a k-th time, and
the logic controller is also used to estimate φ(k), get {circumflex over (φ)}(k) as follows:, ϕ
    ˆ
   
   (
   k
   )
  
  =
  
   
    
     ϕ
     ˆ
    
    (
    
     k
     -
     1
    
    )
   
   +
   
    
     
      ηΔ
      ⁡
      (
      
       k
       -
       1
      
      )
     
     ⁢
     
      (
      
       
        Δ
        ⁢
        
         y
         ⁡
         (
         k
         )
        
       
       -
       
        
         
          ϕ
          ˆ
         
         (
         
          k
          -
          1
         
         )
        
        ⁢
        Δ
        ⁢
        
         u
         ⁡
         (
         
          k
          -
          1
         
         )
        
       
      
      )
     
    
    
     μ
     +
     
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        Δ
        ⁡
        (
        
         k
         -
         1
        
        )
       
       
        ❘
        "\[RightBracketingBar]"
       
      
      2
     
    
   
  
 

wherein {circumflex over (φ)}(k) is an estimate of φ(k), k is a frequency division time, u(k−1) is the control voltage generated according to the actual time period of measuring k−1 frequency division signal, and y(k) is the period of the frequency division signal generated immediately for the k-th time.