Rohde & Schwarz SMU200A - Clock Signals

Instrument Function
R&S
®
SMU200A
330Operating Manual 1007.9845.32 ─ 15
In the case of modulation modes with fewer than 10bits/symbol, the data must be applied
LSB-justified. In the case of 8-PSK modulation for example (3bits/symbol) only data lines
D0, D1 and D2 are used.
The clock reference (symbol clock) used to read in the data can be either internal or
external.
External parallel data is output on the DATA connector serially. However, there is a max-
imum data rate above which serial data processing becomes impossible and the DATA
connector becomes high-impedance. The maximum data rate for parallel data processing
is shown in the data sheet.
5.8.2.4 Clock Signals
The clock reference used for generating the timing pulse can be either internal or external
("Clock Source" selection from the menu: "Internal / External").
Internal clock reference
The table bellow gives an overview of the generated clock signals and the connectors
they are output at for the case a internal clock reference is selected.
Connector Location Clock Mode
CLOCK front panel Bit clock
CLOCK OUT rear panel Choice of bit clock or symbol clock
BITCLK AUX I/O interface, rear panel Bit clock
SYMBCLK AUX I/O interface, rear panel Symbol clock
If required, in the case of two-path instruments the internal bit clock or symbol clock from
path B can be output on one of the USER interfaces.
The clock output signals are assigned in the menu sequence "Setup > Environment >
Global Trigger/Clock/External Inputs > USER Marker /AUX I/O Settings".
External clock reference
An external clock is always supplied via the CLOCK connector. When the external clock
reference is selected, the internal clock is synchronized to it. The table bellow gives an
overview of the connectors the internal clocks are output at.
Baseband Signal - Baseband Block