Service Guide E8364-90001
5- 9
PNA Series Microwave Network Analyzers
Theory of Operation
E8362A, E8363A, E8364A
Source Group Operation
Rear-Panel Interconnects
A11 Phase Lock Board
The A11 phase lock board compares the phase lock IF signal from the A16 test set
motherboard with the phase lock reference signal from the A10 frequency reference board
to generate the tuning voltage for the A12 source 20 YIG-tuned oscillator (YTO). In
addition, various digital-to-analog converters (DACs) on this assembly are set by the A6
SPAM board to inject offset and delay voltages for the various source bands and
measurement sweep rates.
A12 Source 20
The A12 source 20 consists of:
•
•
Multiplier/Amplifier 20 (MA 20)
•
Source 10
The A12 source 20 contains a 3
−
10 GHz YIG-tuned oscillator (YTO) and a fixed frequency
3.8 GHz permanent-magnet YIG oscillator (PMYO).
The YTO has a main coil and an FM coil. These are analogous to the woofer and the
tweeter in a stereo speaker: the woofer reproduces low frequencies and the tweeter
reproduces high frequencies. Similarly in the YTO, the main coil allows large, slow
changes in frequency but cannot respond to high frequency deviations, which are sent to
the faster-acting FM coil.
The tune current from the A11 phase lock board splits into two paths. One path is low-pass
filtered, removing high frequency components, and goes to the YTO main coil; the other
path is highpass filtered, removing low frequency components, and goes to the YTO FM
coil. The filters are matched in stop-band response, such that one picks up where the other
leaves off.
The frequency of the PMYO is set by a voltage received from a DAC set by the A6 SPAM
board.
10 MHz REF. INPUT
A BNC connector that allows an external frequency reference
signal to be used to phase lock the analyzer for increased
frequency accuracy.
The analyzer automatically enables the external frequency
reference feature when a signal is connected to this input. When
the signal is removed, the analyzer automatically switches back to
its internal frequency reference.
10 MHz REF. OUTPUT
A BNC connector that allows a 10 MHz reference signal, produced
by the A10 frequency reference board, to be output for use in
phase locking external test equipment.
Summary of Contents for E8362A
Page 11: ...Service Guide E8364 90001 1 1 1 Safety and Regulatory Information ...
Page 19: ...Service Guide E8364 90001 2 1 2 General Product Information ...
Page 29: ...Service Guide E8364 90001 3 1 3 Tests and Adjustments ...
Page 79: ...Service Guide E8364 90001 4 1 4 Troubleshooting ...
Page 139: ...Service Guide E8364 90001 5 1 5 Theory of Operation ...
Page 169: ...Service Guide E8364 90001 6 1 6 Replaceable Parts ...
Page 215: ...Service Guide E8364 90001 7 1 7 Repair and Replacement Procedures ...
Page 287: ...Service Guide E8364 90001 A 1 A Error Terms ...
Page 303: ...Service Guide E8364 90001 B 1 B Option Enable Utility ...
Page 309: ...Service Guide E8364 90001 C 1 C Firmware Upgrades ...
Page 313: ...Service Guide E8364 90001 D 1 D Operating System Recovery ...