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Front Panel/Motherboard Troubleshooting
Option BBA Description
Option BBA Description
The Analog Baseband I/Q inputs is a hardware option for the N9020A, Signal
Analyzer. The option can be ordered at the time of sale as N9020A-BBA or as a
post sale upgrade as N9020AK-BBA. This option requires a license key to be
fully operational.
The BBIQ option consists of 4 main components:
—LED board
—BBIQ Interface board
— BBIQ Main board
— Low noise ribbon cable that connects the BBIQ Interface board to the BBIQ
Main board
A17 LED Board
— Contains two edge connectors; J2 and J1 that plug into J20 and P100 edge
connectors on the BBIQ Interface board
— Five visible LEDs for user information
— Probe interface contact signals for all four channels I, I, Q, and Q
A18 BBIQ Interface Board
— Allows switching between Single Ended (SE) and Differential (Balanced) for
the two input channels.
—Accommodates 1 M Ω and 50 Ω input paths
— Converts all signals to a differential format with a 2.5V common-mode
voltage to route to the BBIQ Main board over a 60-pin micro coaxial
connector at J1
— Power and control for the BBIQ Interface board are provided from the BBIQ
Main board via a ribbon cable, though some of the power supplies are
locally regulated on the BBIQ Interface board to minimize spurious
responses
— A square wave calibration signal is provided to the user via a BNC Cal Out
connector on the BBIQ Interface board. This signal originates on the BBIQ
Main board and is buffered and attenuated on the BBIQ Interface board
— Passes signals for the LED board and Infinimax probe ID and power from the
60-pin connector from the BBIQ Main board to a pair of edge connectors
that interface to the LED board. ESD protection is provided on the BBIQ
Interface board
— EEPROM is used to identify the board and relay drivers to accommodate the
input path switching. Some of the relay drivers that require fast switching
(for over voltage protection) are on the BBIQ Main board
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