GE LOGIQ 5 Service Manual

GE MEDICAL SYSTEMS
DIRECTION 2300000, REVISION 1 LOGIQ™ 5 SERVICE MANUAL
5 - 8 Section 5-4 - Front End
5-4-3 PMP
5-4-3-1 Overview
The PMP (Pre-Amplifier) board receives and amplifies each 64 echo signals. Then, all 64 echo signals
(from 0 to 63ch) are outputted to the RDS sub-system (two RDS ASSYs) and following 32 echo signals
(from 32 to 63ch) are simultaneously outputted to the CWDOP ASSY via the SIG ASSY.
The PMP ASSY can amplify 64 echo signals. So, the echo signals are received by a PMP ASSY under
appropriate control. The PMP ASSY are inserted into Nest box, which is composed of BACKPLANE
board and other several daughter boards.
The PMP ASSY have main three blocks: Pre-amp and Gain Control and Mode control block.
the PMP ASSY amplifies the echo signals. The mode control block selects a maximum gain code via
dedicated control signals from FEC.
The analog signal provided by Gain Control block gives total amplified gain.
The block diagram above of the PMP ASSY for a received signal is given. Actually, there are 64
channels equivalent to figure above for a PMP ASSY.
The Pre-amp block consists of Low Noise Amplifier (LNA) and Variable Gain Amplifier (VGA). A
received signal is amplified by LNA (fixed gain), then amplified by VGA (variable gain).
Figure 5-7 PMP Block Diagram For a Channel
Rx Ch #0
Rx Ch #1
Rx Ch #2
Rx Ch
#3
Rx Ch #28
Rx Ch #29
Rx Ch #30
Rx Ch
#31
Rx Ch #32
Rx Ch #33
Rx Ch #34
Rx Ch
#35
Rx Ch #60
Rx Ch #61
Rx Ch #62
Rx Ch
#63
Rx Sig[63:0]
To RDS As
sy
64
STCW Sig[31:
0]
To CWDOP As
sy
32
PGC
Signal
Buffer
PGC Analog Sig.
From FEC
Test
Signal
Buffer
Test Sig. From F EC
F
or Assy Diagnositic

GE LOGIQ 5 Specifications

General

Brand	GE
Model	LOGIQ 5
Category	Medical Equipment
Language	English