tipl - clocks and timing - pll building blocks part 1

PLL Building Blocks Part 1
TI Precision Labs – Clocks and Timing
Presented by Dean Banerjee
Prepared by Liam Keese
1

R Divider
1/D
Output
Divider
Reference
Oscillator
1/N
1/R
VCOLoop
Filter
Phase
Detector/
Charge Pump
N Divider
KPD Z(s)
Phase lock loop (PLL) block diagram
2

R Divider
1/D
Output
Divider
Reference
Oscillator
1/N
1/R
VCOLoop
Filter
Phase
Detector/
Charge Pump
N Divider
KPD Z(s)
Voltage controlled oscillator (VCO)
3

4
VCO resonator
LC
CL
f 2
1
g
L
 2
Tau = period
L = length of the pendulum
g = acceleration due to gravity
f = resonant frequency
L = inductance
C = capacitance

5
The real-world inductor
RLf R
X
)f(Q L
L
L
 2
RL