Example - MOGlabs ARF021 Manual

6.5 Example

6.5 Example
measured optical power. If the measured power is too high, the
power is increased and more light is diverted into the diffracted out-
put. This allows fluctuations in intensity to be suppressed, at the
expense of reducing the transmitted power slightly (typically 90%
transmission is achieved).
The following example configures
set of gain constants. Note that the gain constants must be tuned
for each particular implementation. Optimising the gain constants
in real-time with the Modulation settings window in mogrf (§4.3.2)
while monitoring the measured noise on a spectrum analyser is rec-
ommended for optimal performance.
# Setup channel 1 for PID noise eater feedback
# set sample rate
PID,RATE,1,15.625
# set P, I, D, A gains
PID,GAIN,1,P,0.5
PID,GAIN,1,I,0.05
PID,GAIN,1,D,0
# set overall gain
GAIN,1,AMPL,100
# set frequency and power
FREQ,1,80MHz
POW,1,20dBm
# monitor u(t) on DAC output
PID,MON,1,output
# activate AMPLITUDE control
PID,ENABLE,1,AMPL
# check status
PID,STATUS,1
PID on Channel 1 for a particular
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RF