Editing PLL Carrier Tracking

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[[Category:Block Docs]]
 
[[Category:Block Docs]]
Implements a Phase Locked Loop (PLL) which locks to the carrier of the input frequency and outputs the input signal mixed with that carrier.
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Implements a PLL which locks to the input frequency and outputs the input signal mixed with that carrier.
  
This PLL locks onto a [possibly noisy] reference carrier on the input and outputs that signal, downconverted to DC.
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This PLL locks onto a [possibly noisy] reference carrier on the input and outputs that signal, downconverted to DC
 
 
=== Notes ===
 
 
 
* <b>Important:</b> The frequency parameters below are in <i>radians per sample</i> rather than Hz.<br>
 
<pre>radians per sample = 2 * pi * freq / sample rate</pre>
 
* for example:
 
** input centered at 0 Hz.
 
** Sample rate = 48kHz.
 
** frequency variations to track +- 500Hz.
 
** Max freq = 0.0654
 
** Min freq = -0.0654
 
 
 
* If the input signal were to be at 10kHz, then the Max freq would be 1.374 and the Min freq would be 1.246
 
 
 
* This block seems to require an input signal of at least -30db in order to lock to the carrier.
 
  
 
== Parameters ==
 
== Parameters ==
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; Loop bandwidth (''R'')
 
; Loop bandwidth (''R'')
: The loop bandwidth determines the lock range and should be set in the range of pi/200 to 2pi/100 (0.0157 to 0.0628).
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: The loop bandwidth determines the lock range and should be set around pi/200 2pi/100.
  
 
; Max freq
 
; Max freq
: Maximum frequency of the carrier in <i>radians per sample</i>. See Notes above.
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: Maximum frequency of the carrier in radians per sample
  
 
; Min freq
 
; Min freq
: Minimum frequency of the carrier in <i>radians per sample</i>. See Notes above.
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: Minimum frequency of the carrier in radians per sample
  
 
== Example Flowgraph ==
 
== Example Flowgraph ==
  
This flowgraph shows the use of a PLL Carrier Tracking block in an AM receiver.
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Insert description of flowgraph here, then show a screenshot of the flowgraph and the output if there is an interesting GUI.  Currently we have no standard method of uploading the actual flowgraph to the wiki or git repo, unfortunately.  The plan is to have an example flowgraph showing how the block might be used, for every block, and the flowgraphs will live in the git repo.
 
 
[[File:Complex_to_Mag.png|800px]]
 
  
 
== Source Files ==
 
== Source Files ==

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