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PLL

Engineering
1 of 4
PHASE LOCKED LOOP
Basic Operation of PLL
 It consist of 1. Phase detector 2. Low pass filter 3. Error Amplifier 4. Voltage Controlled Amplifier (VCO) VCO:  It’s a free running multivibrator, operates at a set frequency 𝑓𝑜 called free running frequency, determined by external timing capacitor & resistor.  Shifted either side by dc control voltage Vc.  Frequency deviation is directly proportional to dc control voltage and hence it is called a voltage controlled oscillator(VCO).
Phase Detector:  Compares the input signal Vs of frequency 𝑓𝑠 the output of the VCO.  If differ in frequency and phase an error voltage Ve is generated.  This is basically a multiplier and produces the sum (𝑓𝑠 + 𝑓𝑜) and difference (𝑓𝑠 − 𝑓𝑜) at its output. Low Pass Filter: 

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Pll

  • 3.  It consist of 1. Phase detector 2. Low pass filter 3. Error Amplifier 4. Voltage Controlled Amplifier (VCO) VCO:  It’s a free running multivibrator, operates at a set frequency 𝑓𝑜 called free running frequency, determined by external timing capacitor & resistor.  Shifted either side by dc control voltage Vc.  Frequency deviation is directly proportional to dc control voltage and hence it is called a voltage controlled oscillator(VCO).
  • 4. Phase Detector:  Compares the input signal Vs of frequency 𝑓𝑠 the output of the VCO.  If differ in frequency and phase an error voltage Ve is generated.  This is basically a multiplier and produces the sum (𝑓𝑠 + 𝑓𝑜) and difference (𝑓𝑠 − 𝑓𝑜) at its output. Low Pass Filter: 