Lesson 1 – Analog Modules
115
Source Unit (SRCA)
The source unit (software identifier: SRCA) in the multi-site
baseband analog source & measure provides AWG function and
PMU function.
Figure 1 Source Unit (SRCA) Functional Diagram (single-ended output and CT1 trigger pin)
Pogo Pins
Each unit (source unit or measure unit) in the MCA has four
signal pogo pins (X+, X-, XX+, XX-). X is A for unit 1, B for unit 2,
C for unit 3, ..., and H for unit 8. Thus, for unit 1, the pogo pins
are A+, A-, AA+, and AA-.
Units 1 through 4 are the source units, and X is A to D. For
details, see “Pogo Pin Assignments in MCA” on page 128.
Core Functions
The source unit has the four functions (called core functions):
Audio AWG, Video AWG, PMU (Parametric Measurement Unit), and
V Source (voltage source). The V Source core-function uses the
hardware of the PMU.
While all eight units in the module can be used simultaneously,
each core function in a unit can be used alternately. The core
function can be switched even in a testsuite. For some allowable
combinations of the core functions in a unit, see “Simultaneously
Available Core Functions in Source Unit” on page 117.
Sequencer
X+
X-
(/+)
SRCA
Unit
XX+
(clk)
XX-
Timing
Generator
Master Clock
Unit Trigger
CCLK
CT2
(clk)
CT1
1/N
To each other unit
(seven units)
SYNC CLK
SYNC DATA
Start Sequencer
Core function selector
X: A for Unit 1
B for Unit 2
C for Unit 3
D for Unit 4
Pogo
Pin
Module base section
Waveform Memory
Common Trigger
LPF 1.5k,
30k, Thru
Audio AWG
Video AWG
DAC 24-bit
1024 ksps
DAC 14-bit
100 Msps
Att
1
Offset (DC)
LPF 1.5M,
15M, Thru
Att
–1
Non-inverse
Output Amp
Inverse
1
–1
Non-inverse
Inverse
Offset (DC)
+
–
+
–
PMU
(on module base section)
2
2
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