Optilab, LLC
600 E. Camelback Road, Phoenix, AZ 85012
Phone: 1-888-553-3888, Fax: (602) 343-1489, Email: [email protected]
2.3.2
How to use automatic gain control (AGC) mode
To use
automatic gain control
mode, MC pin has to be set to float and GC pin also has
to be floating. First float MODE (JP6). Then remove jumper on pin 11. Adjust
potentiometer R3 (OA) to the desired output amplitude, clockwise to increase amplitude.
Figure 7. BPR-EVB in AGC Mode
2.4
Operation Instruction
Before powering up BPR make sure evaluation board is at factory default setting (see Fig.
5). This is especially important for first time user. Mount the BPR firmly as instructed in
section 2.1. Use ESD strap during the handling.
Connect both RF output ports to the receiver instrument (e.g., CDR circuit, oscilloscope
etc.) use a pair of RF cables with GPPO (SMPM) connector. These two RF output ports
need AC coupling. Check the specification and setting of the instrument that BPR is
connected to. If DC coupling scheme is used in the corresponding instrument, use
external DC blocks in between.
DC coupling causes high current consumption of BPR
which may damage its TIA!!
Connect the 2-pin power connector on the right edge of evaluation board to the external
DC power supply. A regulated DC voltage source with low voltage ripple is
recommended. Set the current limit to 93 mA. Ramp up the voltage to 3.3V. Now BPR is
operated in MGC mode.
To use AGC mode, ramp down DC power then turn off. Follow the instruction in section
2.3.2 to make proper jumpers then ramp up DC power to 3.3V.
MODE
OA
Jumpers are
removed