MOGlabs FSC100 - Schematics

1.1 Schematics 5
1.1 Schematics
The FSC has two parallel feedback channels that can drive two ac-
tuators simultaneously: a “slow” actuator with large range (usually
a piezo-electric transducer), and a second “fast” actuator (such as
the injection current of a diode laser, or an electro-optic modulator).
The FSC provides precise control of each stage, a gain limit at low
frequency, offsets, a sweep (ramp) generator, and convenient signal
monitoring.
Double integrator [2]
Slow error
SLOW SERVO
Gain
SLOW GAIN
0v
∫ #1
∫ #2
SLOW OUT
+
LF sweep
SLOW INT
SLOW INT
B IN
0v
+
–
CHB
+
+
–
V
REF
A IN
ERR OFFSET
FAST SIGN
SLOW SIGN
INPUT
DC block
0v
0v
INPUT
B
A
MODULATION & SWEEP
MOD IN
+
0v
0v
Bias [3]
FAST OUT
TRIG
BIAS
0v
LF sweep
0v
SPAN
0v
0v
Fixed oset [5]
+
OFFSET
SWEEP IN
RATE
Ramp
Slope [6]
INT/EXT
–
External gain [1]
FAST SERVO
FAST GAIN
P
I
D
NESTED
0v
+
GAIN IN
+
+
0v
Mod [4]
LOCK IN (FAST)
FAST = LOCK
LOCK IN (FAST)
LOCK IN (SLOW)
0v
0v
FAST = LOCK
SLOW = LOCK
+
Figure 1.4: Schematic of the MOGLabs FSC. Green labels refer to controls
on the front-panel and inputs on the back-panel, brown are internal DIPs
witches, and purple are outputs on the back-panel.