Theory of Operation
CSA8000 & TDS8000 Instruments and Sampling Modules
3–3
located on the front panel, also controls all of the power to the instrument except
for part of the circuitry in the Low Voltage Power Supply.
The power supply sends a power fail (~PF) warning to the processor system if
the power is going down.
The fan assembly provides forced air cooling for the instrument. The fans are
controlled by the PPC processor.
The 80E01, 80E02, and 80E03 and are two-channel, low-noise, 12.5, 20 and
50 GHz, samplers, respectively. The 80E02 sampling module has a 28 ps rise
time, the 80E03 17.5 ps and the 80E01, 7 ps.
For the 80E02 and 80E03, a single strobe delivered from the instrument
mainframe to both acquisition channels controls the timing of the strobe
assertion to both channels. If channel-to-channel deskew is zero, the sampling
coincidence between channels is very close. Acquisition deskew function is
carried out by making separate acquisitions over individual acquisition windows.
For the 80E01, an individual strobe delivered from the instrument mainframe to
the acquisition channel controls the timing of the strobe assertion to the channel.
Acquisition deskew function is carried out by moving the strobe timing for the
channel to a unique acquisition window.
Each electrical channel features a Tekpobe Level 2 probe power connector for
attachment of a real time probe. The control of this probe is a mainframe
function.
All module calibration signals are derived from a 2.5 V precision voltage
reference internal to the sampling module. Settings derived from this reference
are stored in a non-volatile EEPROM in the sampling module, although the
responsibility for the execution of these settings is with the mainframe.
For major functional circuit blocks refer to (Figure 9–3).
Fans
80E01, 80E02, 80E03 and
Electrical Sampling
Modules
Содержание CSA8000 Series
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