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The Fixture Top Plate Assembly:



This structure provides for two basic functions.
    • contact to the DIB (DUT iterface board) for DC, AC, and RF resources.
    • contact to and control of application specific functionality, modules, and other related hardware.

Top Plate Features:


Close up of RF Launch:

The Fixture Carrier Board
A major portion of the top plate functionality is made up by the carrier board. With a few exceptions, most fixtures used on the Cassini or RI7100A include a "Carrier Board". This board allows for the addition of application specific functionality, modules, and other related hardware. It also provides the control mechanism for these items. In addition to the function below, the carrier board also provides for the routing of tester resources, both DC and RF, to the DUT Interface Board (DIB).
Some of the functions available include:
    • RF or DC Switching
    • Frequency Division
    • Filtering
    • Signal Attenuation
    • Differential to Single Ended Inputs and Outputs
    • High Speed Digital
    • (New development)

There are two basic types of carrier boards available from Roos instruments - PASSIVE and ACTIVE, also known as "Smart".





Passive Carriers:

The PASSIVE carrier is a subset of the active carrier in terms of fuctionality and can provide the following:

    • All tester resources brought up from the tester/fixture interface (bottom plate assembly).
    Includes DPs, Dbs, Cbits, VMs, Gnds, GndRef, Vrtn, +/- 5V, +/- 12V, 28V, SN, and VCCs.
    • DC voltages to the module socket locations and/or customer specific locations. Additionally, a 3.3 volt resource is provided from an on board regulator chip.
    • Test head CBit control (Cbit 1-8) for RF switches, relays, attenuators, etc...

    Refer to the document titled "Smart Carrier Programming" for an in depth discussion of resources and locations.
How do I identify a Passive Carrier?

The physical board as fabricated for the ACTIVE and PASSIVE carrier boards is the same. The difference is the amount of electronic circuitry that is actually loaded at the time of assembly. Passive Carriers are missing the carrier caps around a EEPROM, the control EEPROM is missing, regenerated CBit Circuitry missing, and Green Jumper wires are present.



EEPROM location


Active Carriers:

The ACTIVE carrier provides for control of fixture based instruments and socketed modules. In addition to the PASSIVE carrier capabilities, it has:

    • Four static control lines per each module socket.
    • Clock, strobe, and data read/write lines on some of the module sockets.
    • Regenerated Cbits 1-8.


12RF or 20RF Carriers

The fixture carriers, as they exist today, are available in two sizes (12RF and 20RF). The functionality for either of these is the same. That is 12RF Passive = 20RF Passive and 12RF Active = 20RF Active functionally regardless of physical size. The major differences between the two is that the 20RF has ten module sockets, twenty RF locations, and 192 pogo positions while the 12RF version has 12RF locations, eight module sockets, and 128 pogo locations.



The following pages include reference information for using the active or passive carrier in a fixture. For more details about past vs present types of carrier boards and their resource capabilities please refer to Fixture Carriers (12RF) and Fixture Carriers (20RF)

12 RF Carrier Features


20 RF Carrier Features


Carrier View from Test Head Bottom:







Grounds and Guards: (Verified for RI7100A Gen3 models only)
X = Connected to Carrier Ground
Y = Connected to Test Head Ground
GRD = GND except for H1-321

Pin Name
Label
Grounded On
Test Head
Grounded On Fixture Carrier
2AC
Grounded On
Fixture Carrier
4VA
Grounded On
Fixture Carrier
4VB
Grounded On
Fixture Carrier
65A
H1-1
GND
Y
X
X
X
X
H1-9
GND
Y
X
X
X
X
H1-12
GRD
Y
X
X
H1-19
GND
Y
X
H1-22
GRD
Y
X
H1-32
GRD
Y
X
Clipped on Bottom Board1
Clipped on Bottom Board1
Clipped on Bottom Board1
H1-39
GRD
Y
X
X
X
X
H2-11
VRTN
Y
H2-21
GND
Y
X
X
X
X
H2-30
GND
Y
X
X
H2-31
GND
Y
X
X
X
X
H2-39
GND
Y
X
X
X
X

Notes:
  1. Pin H1-32 (next to VM1N) needs to be clipped on the bottom board. This is due to the test head configuration on this pin. On older generation test heads this pin was a current drive pin. With out cutting this pin (attached to ground) this resource was shorted out and caused damage to the test head.

Module Voltages:

Note:
1. DS1-4 are not available on Passive carrier boards


Module Placement Selection Criteria:
Socket
Functionality
Select
Socket
Command Types
Examples
Also Supported
Modules requiring a high speed clock (400KHz) or register writesM1,M5"S" type, and "M" type

S3 used as clock in high speed clock applications.
High Speed Digital
Fixture Mux
All other Fixture Modules
Modules requiring static data sets to set config. Includes register writes.M1-M8 (65A) Also M9-M10 for 6KA/B
"S" type, and "M" type Switches and Attenuators
Fixture Mux
All other Fixture Modules not requiring a high speed clock input.
Subset of normal socket functionality. Does not include register write commands ("M" type).M9&M10
super smart carrier only (Y00065A)
"S" type only.Switches and Attenuators
Excludes all modules needing "M" type control.
Fixture Mux and Cbit Expander modules will not work here.
Fixture Voltages Only M11-M13 (6KA)Only Cbit Driven Devices.


Notes:
  1. VIs are not available on carriers marked Y0004VA and Y00065A.
  2. Modules not usable on carrier boards marked Y0002AC are the Advanced High Speed Diff I/O RIK0087A, the High Speed Digital, and the RIK0088A Fixture Mux modules.
  3. 3.3V is generated by a regulator circuit on carriers marked Y0004VA and Y00065A.
  4. DS1-4 are data set lines for controlling module configuration.

See also, Database 'Product Docs', View 'Manuals\Training Manual\Table Of Contents', Document 'Smart Carrier Module Truth Tables'Smart Carrier Module Truth Tables


Resource Cable Color Codes:

Resource
Color
Resource
Color
Resource
Color
Resource
Color
Cbit2
Black
-12V
Black
DB9
Black
DB1
Black
Cbit1
Brown
VRTN
Brown
GND
Brown
GND
Brown
Cbit4
Red
+28V
Red
DB11
Red
DB3
Red
Cbit3
Orange
+12V
Orange
DB10
Orange
DB2
Orange
Cbit6
Yellow
SP
Yellow
DB13
Yellow
DB5
Yellow
Cbit5
Green
S/N
Green
DB12
Green
DB4
Green
Cbit8
Blue
SP
Blue
DB15
Blue
DB7
Blue
Cbit7
Violet
SP
Violet
DB14
Violet
DB6
Violet
+5V
Grey
SP
Grey
GND
Grey
DB8
Grey
-5V
White
SP
White
DB16
White
GND
White
Resource
Color
Resource
Color
Resource
Color
Resource
Color
VCC5F
Black
GRD
Black
GRD
Black
GRD
Black
GND
Brown
DP1
Brown
DP9
Brown
VM1
Brown
VCC5S
Red
DP2
Red
DP10
Red
VM1N
Red
VCC6F
Orange
DP3
Orange
DP11
Orange
VM2
Orange
VCC6S
Yellow
DP4
Yellow
DP12
Yellow
VM2N
Yellow
VCC7F
Green
DP5
Green
DP13
Green
VM3
Green
VCC7S
Blue
DP6
Blue
DP14
Blue
VM3N
Blue
VCC8F
Violet
DP7
Violet
DP15
Violet
VM4
Violet
VCC8S
Grey
DP8
Grey
DP16
Grey
VM4N
Grey
GND
White
GND
White
GREF
White
GND
White

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