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PLLs WITH INTEGRATED VCO - MICROWAVE APPLICATIONS
4.3.4
ActiveC Loop Filter
the activec loop filter consists of c33, r25, c62, c63, r3, r21, c61, r14, r15, c60 and op-amp u5. it
can be configured by removing r4, r12, r13, r22, c37, c64, shorting r26, JP6, and powering +15V on.
it should be noted that the activec loop filter is a very popular choice since it does not have the minimum
or maximum Vtune limits as the Passive or Passivedc filters do.
For technical application questions: Phone: 978-250-3343 or
v01.0910
EVALUATION BOARD OPERATING GUIDE
Figure 8. ActiveC Loop Filter
Order On-line at
www.hittite.com
pll@hittite.com
a
A - 10
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