Agilent Technologies PSG Series Service Manual page 86

A6 Frac-N (Fine Tune)
H_FM_INV MOD_CONTROL
Z o
H_SD_FM
FM
L_SD_OFF
1 MHz PM
L_FM_OFF FM_OUT_
0.1 MHz PM
BAND_
DAC
7 9
Control 5
2
FM_OFF_H
Frac-N
Prescaler Control
S D
16
Atten & 3 5
Mod
Offset
16
FM_IN_BAND_DAC
FM
Reclocked
Data I/O
VCO/N
Prescaler
FM_IN_BAND_OFFSET_DAC
7
5 MHz
Reference Phase
Loop Filter &
Divider /2 Detector Lead-Lag
GAIN_CONTROL_DAC
7
Reference Input
3
10 MHz TCXO
FM Input From
A11 Pulse / Analog
Modulation Generator
A7 Reference (Option UNJ)
A32 10 MHz
Crystal Oscillator
10 MHz
Ext
10 MHz
10 MHz
In
x 10
100 MHz
100 MHz
500 MHz 500 MHz 1 GHz
x 5 x 2
Note: This drawing shows the A7 Reference (Option UNJ).
Both the A7 Reference (Standard) and the A7 Reference (Option UNJ)
have the same input and output signals.
se989a
ATTEN_
CONTROL
YTO_FM
Source Settled
Indicators SOURCE_SETTLED_H
L_RST
Control
L_WIDELBW
L_POS_PHASE_INCR
STRB
10 dB
VCO
FRACN_SWP_L
FM
VCO
Tune
500-1000 MHz
12 dB
EE_POT_
CONTROL RF
Power
Detector
To Analog Bus
VCO Out
10 MHz to
A6 Frac-N
A31 Motherboard
Ext
10 MHz
10 MHz
Out
10 MHz Digital Out
10 MHz
Digital Out to
A11 Pulse / Analog
Modulation Generator
1 GHz-OUT_LOWBAND
ON / OFF
F
1 GHz
1 GHz 50 MHz
Output to
A8 Output
1 GHz
1 GHz
Output to
A5 Sampler
A9 YIG Driver
V_GHZ_DAC FM_FREQ_COMP_L
FM_GAIN_DAC FM_FREQ_COMP
VSWP_DAC FM_FREQ_COMP_H
FM_ATTEN
FM_ATTEN_L
230: :1k
FM_ATTEN_H 800k
: :
:
:4k YIG
230
+32 V
2k
PRETUNE_DAC
HOLD_DAC
COMP_DAC
Pretune
Speedup
H_SPEEDUP_EN
LYO Loop Hold 1
A5 Sampler / YO Loop (Coarse Tune)
LFNSWP
¸ 2
¸ P
14 dB
J6 Frac-N In
J1 1 GHz In
500 - 1000 MHz +5dBm
RF
LO
4
750 MHz
1 GHz RF
FNDIV
J1 1 GHz In
¸ 4
250 MHz LO
HIGH_LOW
MULTR LATCH
STROBE
L_CRSPLL_Pretune
MULTR 1- Shot
H_PRESET_EN
6 L CRS PLL
UNLK
+/- 1
F
750 MHz C M
Unlock
¦
x ----
256 Detector
155 MHz
Mixer IF
12 to 155 MHz
750 MHz 900 MHz
LO RF
750 MHz B
FM
Coil
A29 20 GHz Doubler
J1 3-10
> 3.2-10 GHz
3-10
> + 13 dBm 3-10
750 MHz
5-10
Main
10-13
10-20
Coil
X2
Doubler
16-20
13-16
3-10
J4 to A5 Sampler J3 to A6 Frac-N
3.2 - 10 GHz 3.2 - 10 GHz
> -7 dBm > -7 dBm
FM_OFF_H
Mode A
H_PRESET_EN L_YOPLL_OPEN
L_YOPLL_PRESET
YOLGAIN
1 - Shot
STROBE
0.2 ms
Mode B
FM MODE
1 - Shot
& MULTR
1.0 ms
STROBE
FM_MODE_A_B
(from YO Driver) LYOSLEW
(from FRAC-N) LFNSWP
f
IF
L_HOLD
L_YOL_UNLK
F
YO PLL
¦
Unlock
Detector
YOLGAIN
+15V
80 MHz
Sampler IF
30 to 64 MHz
f
S
618 to 905 MHz
900 MHz
VCO
LO
S
_
Vtune
f
+
S
Block Diagram for the Reference / Synthesis Loop
3-20
J2
80 MHz
>3.2 - 20 GHz
Limiter
> 14 dBm
SOURCE_SETTLED_H
YO_PREDAC
A Bus
YO
Phase-
lock
_
+
3.2 - 10 GHz From
RF
(A28 YIG Oscillator)
f
YO