5.3
Display Panels
dimtel
dimtel
Figure 15: General-purpose I/O panel: bit-by-bit driver
Figure 16 shows the front/back-end panel. This panel is split into two
portions: front/back-end registers and the phase servo loop. The register con-
trols include front and back-end phase and attenuation. Front-end phase reg-
ister setting is provided as a readout labeled FRONT-END PHASE DAC SET-
TING. When the phase servo loop is open the register is directly driven by
the front-end phase control setpoint. Closed phase servo loop adjusts the
register value around the setpoint to center the ADC signal. Front and back-
end attenuation settings adjust digital attenuators in steps of 0.5 dB. Control
values are in dB and are rounded automatically. Full adjustment range is
from 0 to 31.5 dB.
Phase servo loop can be closed and opened by the LOOP CLOSURE
32 of 58
