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HP 8663A
SYNTHESIZED SIGNAL GENERATOR
(Including Options 001, 002, & 003)
Service Manual
v01uw& TiL
SERIAL NUMBERS

This manual appliesdkectly to instrumentswith
serialnumberspr&xedz
2234A to 2927A andall MAJORchanges that applyto your imtrument.
rw. 0.l JUL91

For additionalimpm-tantinformation aboutserial
mmbers,refer to ~INSTRUMENTS COVERED BY
THE? MANUAL" in Section 1.

Third Edition

This materialmay bs reproduced or for the U.S.
by
Government pursuantto the CopytightLicenseWI-
der the clause l3Fm 52.227-7013 1988).
at UPR

Copyright@HEWLETT-PACKARD COMPANY 1982
EAST 24001 MISSION AVENUE, TAF G34, SPOKANE, WASIIINGTON, U.S.A. 99220




Prhted I" lJ.s.*. : No"elnner two



HEWLETT
PACKARD
COPYRIGHT AND DISCLAIMER NOTICE

Copyright - Agilent Technologies, Inc. Reproduced with the permission of Agilent
Technologies Inc. Agilent Technologies, Inc. makes no warranty of any kind with regard
to this material including, but not limited to, the implied warranties of merchantability
and fitness for a particular purpose. Agilent Technologies, Inc. is not liable for errors
contained herein or for incidental or consequential damages in connection with the
furnishing, performance, or use of this material or data.
Model 8663A Volume 2 ConteIlti




VOLUME 2 CONtENTS

SCheimzULz Theory/Trouble- Pan*
salvica Mock Assembly or SectIon ShootinS List
Sheet Diagram Page Page
Number Number Number

SD1 - Overall Block Diagram (Instrument Level) a-201
602 - uefersnce secuoll 6-21.3 -

SD3 - High Frsquency Lcops Section e-217 -

BD4 - FrsctiOnal-N Loops Section 6-223
BD5 - Low Prequency Loops Section 6-235 -

BD6 output saction 0-241 -

SD7 - ModulaUon Section 6-249 -

SD8 - Phase Modulation Ssction 6-257 -

BD9 - DigItsI control unit (DCU) section E-261
SD10 - pdwsr Supply Section 6-269 -

SSl ED2 AM3 10 MHz Reference Oscklator 6-301 6-i 76
SD2 A6A4 Referenca Buff.sr

ss2 BD2 A6Al Referents Section LF MultIplier e-307 6-117
ss3 BD2 AM3 Referwwe Section HF MultIplier 6-313 6-l 25
ss4 SD2 A6A2 Reference Section LO Drive 5319 6-121
SS5 BD3 A6A9 HP Loops and Reference SectIons controller 6-325 6-l 55

SS6 BD3 A6A6 Fwferencs Sum Loop RF Mixw e-331 6-149
ss7 SD3 AM5 Rafwonce Sum Loop Phase Detector a-337 E-133
SS8 BD3 A6A5 Reference Sum Loop Phase Detector 6-347 6-133
ss9 SD3 A6A7 RF Buffsr 6-355 6-151
SSlO BD3 A6A6 Output Sum Loop RF Mlxsr 6-361 6-153
s.C.11 SD3 A6A4 Output Sum Loop Phase Detector 6-367 6-133
SW2 BD3 ABA4 Output Sum Loop Phase Detector ' .9-w7 6-l 33




rm3OSEP88
Model 8663A Service



SERVICE SHEET BDl
OVERALL BLOCK DIAGRAM

REFERENCE:
Simplified Operation (Sec'tion III)
Opera't~r~s Checks (Section III)
Table 4-l. Recommended Performance Tests
After Adjustments or Repairs.
Table 5-2. Post-Repair Adjustment Procedures

PRINCIPLES OF OPERATION
The basic frequency generating circuitry is composed of the Reference
Section, phase lock loops and Output Section (in the upper-left> aenter
and right hand portions of the block diagram respectively). All of
the reference frequencies used within the instrument are obtained from
the Reference Section. A total of seven phase lock loops work together
.Lo produce the fundamental fre'quency band of 320 'to 640 MHz with a
step resolution of 0.1 Hz. This fundamental (or basic) band is SW-t
to the Output Section where it is doubled, passed straight through or
down-converted to produce the entire frequency range at the RF output
(.l to 2560 MHZ).
The Digi,tal Control Unit (DCU) controls the operation of the unit.
It accepts keyboard or remote inputs and generates internal data and
control signals to control the signal at the RF output. Power for the
instrument is supplied by a switching-regulated power supply.

Reference Section
AlI of the reference frequencies used within the instrument are
obtained from the Reference Section. This block is composed of doublers,
dividers, and mixers, all of which are driven by a single temperature-
s,tabilized 10 MHz crystal oscillator. Outputs from the Reference Section
are 10, 20, 120, 520, and 320-640 MHZ (in 20 MHz steps). Signal levels
vary depending on which section they are being sent to.

Phase Lock Loops
'The Generator uses the indirect synthesis method for generating output
l'requencies. Phase lock loop (PLL) circuits are locked to signals from
the Reference Section and generate signals which are combined to giv@
the desired output frequency, All output frequencies retain the same
accuracy and stability as the 1C MHz reference signal. PLL's are found
in ,the IHigh Frequency, Low Frequency, Fractional-N, and Modulation
Sections.