Atec Anritsu-MG3690 Series - Manual (Page 2)

2
Options 4 and 5: Frequency extension down to 8 MHz
Two options are available to extend the 2 GHz low end frequency limit of the base
models down to 8 MHz. Option 4 uses a digital down-converter (DDC) with successive
divide-by-two circuitry. It offers the best phase noise performance of the two choices, at
the expense of some analog performance < 500 MHz. In that range, analog sweep mode
is not available, and pulse modulation performance is specified as typical. In addition,
frequency and phase modulation mod index is scaled by the division ratio of each band
of the DDC. Option 5 maintains all analog performance by using a heterodyne mixing
down-converter, but does not improve phase noise performance.
Option 22: Frequency extension down to DC
If frequency coverage down to 0.1 Hz is desired, Option 22 can be added with either
Option 4 or 5. Option 22 uses Direct Digital Synthesis (DDS) for CW and Step Sweep
modes of operation. Modulation and analog sweep are not available in the DDS band.
Frequency resolution < 10 MHz is 0.02 Hz. Output power across the complete instrument
frequency range is degraded by 2 dB.
CW Mode
Output: Twenty independent, presettable CW frequencies
(F0 – F9 and M0 – M9).
Accuracy: Same as internal or external 10 MHz time base.
Internal Time Base Stability:
With Aging: < 2 x 10
–9 /day (< 5 x 10 –10 /day with Option 16)
With Temperature: < 2 x 10 –8 /deg C over 0 ºC to 55 ºC (< 2 x 10 –10 /deg C with Option 16)
Resolution: 0.01 Hz
Internal Time Base Calibration: The internal time base can be calibrated via the System
Cal menu to match an external reference (10 MHz ± 50 Hz).
External 10 MHz Reference Input: Accepts external 10 MHz ± 50 Hz (typical),
0 to +20 dBm time base signal. Automatically disconnects the internal high-stability
time-base option, if installed. BNC, rear panel, 50 Ω impedance. Selectable Bandwidth
for best phase noise immunity or best phase tracking performance.
10 MHz Reference Output: 1 Vp-p into 50 Ω, AC coupled.
Rear panel BNC; 50 Ω impedance.
Phase Offset: Adjustable in 0.1 degree steps.
Electronic Frequency Control (EFC) Input: –4V to +4V input range;
8 x 10
–8 .Fout Hz/V sensitivity (typical); ≤ 250 Hz Modulation BW; Rear panel BNC;
High Impedance
Phase-Locked Step Sweep Mode
Sweep Width: Independently selected, 0.01 Hz to full range. Every frequency step in
sweep range is phase-locked.
Accuracy: Same as internal or external 10 MHz time base.
Resolution (Minimum Step Size): 0.01 Hz
Linear/Log Sweep: User-selectable linear or log sweep.
In log sweep, step size logarithmically increases with frequency.
Steps: User-selectable number of steps or the step size.
Number of Steps: Variable from 1 to 10,000
Step Size: 0.01 Hz to the full frequency range of the instrument.
(If the step size does not divide into the selected frequency range,
the last step is truncated)
Dwell Time Per Step: Variable from 1 ms to 99 seconds
Fixed Rate Sweep: Allows the user to set the total time of the sweep,
including lock time. Variable from 20 ms to 99 seconds.
Analog Sweep Mode (Option 6)
Sweep Width: Independently selected from 1 MHz to full frequency range. With Option 4,
Digital Down Converter, Analog sweep is only available ≥ 500 MHz. Analog sweep is not
available < 10 MHz with Option 22.
Accuracy: The lesser of ± 30 MHz or (± 2 MHz + 0.25% of sweep width)
for Sweep Speeds of ≤ 50 MHz/ms (typical)
Sweep Time Range: 30 ms to 99 seconds
Alternate Sweep Mode
Sweeps alternately in step sweep between any two sweep ranges. Each sweep range
may be associated with a power level.
Manual Sweep Mode
Provides stepped, phase-locked adjustment of frequency between sweep limits.
User-selectable number of steps or step size.
List Sweep Mode
Under GPIB control or via the front panel, up to 4 tables with 2000 non-sequential
frequency/power sets can be stored and then addressed as a phase-locked step sweep.
One table of 2000 points is stored in non-volatile memory, all other tables are stored in
volatile memory.
Programmable Frequency Agility
Under GPIB control, up to 3202 non-sequential frequency/power sets can be stored and
then addressed as a phase-locked step sweep. Data stored in volatile memory.
Markers
Up to 20 independent, settable markers (F0 – F9 and M0 – M9).
Video Markers: +5V or –5V marker output, selectable from system menus. AUX I/O
connector, rear panel.
Intensity Markers: Produces an intensity dot on analog display traces, obtained by
a momentary dwell in RF sweep, in analog sweeps of < 1s.
Marker Accuracy: Same as sweep frequency accuracy.
Marker Resolution:
Analog Sweep: 1 MHz or Sweep Width/4096 which ever is greater.
Step Sweep: 0.01 Hz.
Sweep Triggering
Sweep triggering is provided for Analog Frequency Sweep, Step Frequency Sweep,
List Frequency Sweep, and CW Power Sweep.
Auto: Triggers sweep automatically.
External: Triggers a sweep on the low to high transition of an external TTL signal. AUX
I/O connector, rear panel.
Single: Triggers, aborts, and resets a single sweep. Reset sweep may be selected to be
at the top or bottom of the sweep.
Model/Option No. Frequency Coverage Output Type
MG3691C 2 GHz to 10 GHz K(f)
MG3692C 2 GHz to 20 GHz K(f)
MG3693C 2 GHz to 31.8 GHz K(f)
MG3694C 2 GHz to 40 GHz K(f)
MG3695C 2 GHz to 50 GHz V(f)
MG3697C 2 GHz to 67 GHz* V(f)
Option 4 8 MHz to 2.2 GHz** Model No. Dependent
Option 5 8 MHz to 2 GHz** Model No. Dependent
Option 22 0.1 Hz to 10 MHz Model No. Dependent
Specifications
The specifications in the following pages describe the warranted performance of the
generator for 25 ± 10 °C. Typical specifications describe expected, but not warranted,
performance based on sample testing.
Frequency Coverage
* Operational to 70 GHz
** All specifications apply ≥ 10 MHz