Agilent Technologies 8960 Series Reference Manual page 623

• Providing I/Q baseband signals which are sent to the I/Q modulator in the RF Source
Analog To Digital Converter Module
Following the Measurement Downconverter and Demodulation Downconverter IF 1 is the Analog to Digital
Converter module. The purpose of the Analog to Digital Converter module is to convert the downconverted
analog signals into digital data streams which can be processed by the Digital Signal Processing module.
In order to maintain the radio link of non-CDMA formats, the downconversion path through the Demodulation
Downconverter module has a dedicated A/D conversion path.
To optimize measurement throughput, the fast RF power detector also has a single dedicated A/D path. This
allows power measurements, in many cases, to be made concurrently with other measurements. The two
outputs from the Measurement Downconverter module and the Audio In signal share a single multiplexed A/D
path.
The outputs of the various analog to digital converters on the Analog to Digital Converter module share a
common data bus with the Digital Signal Processing module.
Digital Signal Processing Module
The Digital Signal Processing (DSP) module is responsible for a variety of tasks within the overall test set
architecture. These tasks are:
• demodulating data from the radio under test (data received from the Demodulation Downconverter module) and sending
the demodulated data bits to the Protocol Processor module
• for some systems, perform audio measurements using audio information sent to the DSP module from the Protocol
Processor module
• execute a variety of signal processing algorithms to perform measurements on the radio system of the currently loaded
TA (data received from the power detector ADC, the measurement ADC and, in some cases, data received from the
Demodulation Downconverter ADC)
The DSP processor communicates with the Host Processor and the Protocol Processor, as well as controlling
the configuration and synchronization of the Analog To Digital Converter module.
Host Processor Module
The Host Processor module is responsible for a variety of tasks within the overall test set architecture. These
tasks include:
• control of the manual user interface (MUI)
• executing commands and processing data received from the LAN interface
• executing commands and processing data received from the GPIB interface
• controlling hard disk access
• control of all RF and audio hardware modules
• routing measurement results received form the Digital Signal Processing and Protocol Processor modules to the
appropriate output device (display, GPIB, LAN, serial, etc.)
S:\Hp8960\E1963A WCDMA\4.0 release\Reference Guide\Chapters\wcdma_gen_block_diagram.fm
Block Diagram
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