Service manual

GE MEDICAL SYSTEMS
D
IRECTION 2300749-100, REVISION 2LOGIQ
TM
3 SERVICE MANUAL
Chapter 5 5-5
5-2-2 Front End
The Front End Consists of Conn. Board, Transmit Board, Receive Board & Digital Beam Former.
Figure 5-3 The Front End
The Front End generates electrical signals which are transmitted by the probes as ultrasound into the
body. It also receives weak ultrasound echoes from blood cells and body structure, amplifies these
signals and converts them to an 12 bit digital signal.
The digital representation of this signal is presented to the mid processor section.
RXB (Receive Board): The Preamplifier amplifies echo signals. The reception signals are sent to DBF.
DBF (Digital Beam Former): Performs receive delay summing for channels
TXB (Transmit Board): This has channel bipolar drivers, delay calculators.