Fundamental Technologies Galileo Spacecraft Pages

CMS Analog Electronics (Post-Challenger Information)

Source: The Galileo Energetic Particles Detector, D. J. Williams et al., Space Science Reviews, 60, 385, 1992 (excerpts)

Figure 1-16 shows a block diagram of the CMS analog electronics. The velocity measurement is made via the Time-to-Amplitude Conversion (TAC) electronics, which measure ion velocity by converting microchannel plate-produced start and stop charge pulses into a bipolar linear signal whose amplitude is proportional to the time-of-flight of the ions over a known distance. The analog signal shaping times are similar to those used on the other CMS channels.

Figure 1-16. CMS analog signal processing block diagram.

Figure 1-17. CMS, new design. Source: Critical Design Review, Dec., 1987.

Pulse Height Analyzer (PHA) - Changes to Existing Circuit Boards
Source: Critical Design Review, Dec. 1987

• Functional Description of Changes
  1. Latch added for channel select line (J select)
  2. PHA "event active" signal definition changed
  3. Amplifier gains tailored
• Component Packaging: Minor Changes
• Parts Questions: None
• Functional Testing Results: No Problems
• Known Outstanding Design Issues: None
• Scope: Add 1 component; add 12 lines, remove 2

EPD PHA modifications block diagram

Continue: T.A.C. Board

Return to Galileo EPD Handbook Table of Contents Page.
Return to Fundamental Technologies Main Galileo Page.
Return to Fundamental Technologies Home Page.

Updated 3/2/04, T. Hunt-Ward
tizby@ftecs.com