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.

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 writes	M1,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, 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