dvanteX SG8-HP(SS)01M-C2U42HP315
RF Signal Generator 10MHz-8GHz
IF/RF & Microwave Design
www.advantexrf.com 2 OVERVIEW
1 Package Contents
The following items are included to the delivery package:
Item# Description Qty. Note
1 SG8 RF Signal Generator 10 MHz – 8 GHz 1
2 AC power cord with CEE 7/7 (E+F Type) plug 1 Note 1
3 USB Cable A-B, 3m (9.8ft.) 1
4 RS-232 Cable, D-sub 9F - D-sub 9M, 3m (9.8ft.) 0/1 Note 2
5 CD with drivers and documentation 1
6 SG8 Operating Manual (printed version) 1
7 Calibration certificate 1
8 Warranty certificate 1
9 Packing List 1
Note 1: By default the power cord with CEE 7/7 (E+F Type) plug is placed
if not explicitly specified by the customer.
Note 2: By default it’s not placed if not requested by customer.
2 Overview
Figure 1 shows the block diagram of the RF-synthesizer, the main block of the
instrument. Reference frequency signal is fed to the positive input of phase-
frequency detector (PFD) . PFD output signal is fed to the loop-filter, then
to the octave VCO control input. Via splitter signal is fed to fixed frequency
divider by 8, then to Direct Digital Synthesizer (DDS). Signal from the output
of the DDS is being filtered and fed to the negative PFD input, thus closing the
feed-back loop of the PLL system. DDS is used in this scheme like frequency
divider with very small step of the division factor tuning. VCO output signal
is fed further to frequency division block, following by the harmonic filtering
block. From the filtering block it’s further fed to the automatic power control
block (APC), then to the RF Out output. Output amplifier is connected with
output connector directly (via APC’s splitter), so it allows to gain maximum
power at the RF Out which output stage is capable of.
There are some rations of output and reference frequencies at which extra
spurs produced by the DDS appear at the output. In order to avoid this effect
the switchable reference frequency source can be applied. Figure 2 shows the
block diagram of the instrument with additional spur suppression option (SS
option). The difference consists of the second reference frequency generation
for the RF-synthesizer block. The original reference frequency (147 MHz) from
internal TCXO is fed to the PLL with VCXO and very narrow loop filter. PLL
forms the second reference frequency 150 MHz. Signals from internal reference
source and PLL are connected to the switch and its output is connected with
reference frequency input of the RF-synthesizer. Either 147 or 150 MHz is used
in accordance with given frequency at the RF Out output. The selection of
the reference frequency is automatically controlled by the instrument to ob-
tain least possible spur level. The accuracy of the output frequency step while
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