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LM565 bảng dữ liệu(PDF) 11 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  Phase Locked Loop
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LM565 bảng dữ liệu(HTML) 11 Page - Texas Instruments

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OBSOLETE
LM565, LM565C
www.ti.com
SNOSBU1B – MAY 1999 – REVISED APRIL 2013
APPLICATIONS INFORMATION
In designing with phase locked loops such as the LM565, the important parameters of interest are:
FREE RUNNING FREQUENCY
(1)
LOOP GAIN: relates the amount of phase change between the input signal and the VCO signal for a shift in input
signal frequency (assuming the loop remains in lock). In servo theory, this is called the “velocity error coefficient.”
(2)
The loop gain of the LM565 is dependent on supply voltage, and may be found from:
(3)
fo = VCO frequency in Hz
Vc = total supply voltage to circuit
Loop gain may be reduced by connecting a resistor between pins 6 and 7; this reduces the load impedance on
the output amplifier and hence the loop gain.
HOLD IN RANGE: the range of frequencies that the loop will remain in lock after initially being locked.
where
fo= free running frequency of VCO
Vc= total supply voltage to the circuit
(4)
THE LOOP FILTER
In almost all applications, it will be desirable to filter the signal at the output of the phase detector (pin 7); this
filter may take one of two forms:
Figure 16. Simple Lead Filter
Figure 17. Lag-Lead Filter
Copyright © 1999–2013, Texas Instruments Incorporated
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