Table of Contents
TRigger-Onboard Gigahertz Digitizer Optimized for Range (TROGDOR)
TROGDOR is an application specific integrated circuit (ASIC) that will serve as a prototype for the waveform sampler of the Gigasample Recorder of Analog waveforms from a PHotodetector (GRAPH). The GRAPH ASIC will take 8 channels of raw input signals from a microchannel plate photomultiplier tube (MCP-PMT), amplify and shape them using a charge sensitive amplifier (CSA), digitize the amplifier outputs at ~1 gigasample per second, and allow multiplexed readout of these waveforms to an external FPGA for analysis.
TROGDOR will isolate the waveform digitization portion of the full GRAPH ASIC, allowing independent design and optimization for a low-noise waveform digitizer with the necessary dynamic range of the final GRAPH ASIC.
Specification Review
A specification review was held on February 16, 2010 during class. Original slides are available here. Other material on this page will reflect updates based on comments, corrections, or other changes.
Table of Specifications
| Specification | Value | Comment |
|---|---|---|
| Input channels | 8 | Differential |
| Sampling cells | 128 | 2 rows of 64 cells |
| Storage cells | 2048 | 32 rows of 64 cells |
| Sampling rate | ~1 GSa/s | |
| Dynamic range | ~11 bits | As high as possible |
| Wilkinson Clock | 2 GHz | ?Confirm? |
| Buffer depth | 2 microsec | @ 1 GSa/s |
| Throughput | ~4 MHz | w/ ~0 dead time |
| Trigger outputs | 8(?) | Check pin constraints |
| Trigger thresholds | 8(?) | Check pin constraints |
| Data ouptuts | 4 | LVDS, check pin constraints |
TROGDOR Block Diagram
GRAPH Block Diagram
The following is a rough block diagram of the GRAPH ASIC. The TROGDOR ASIC will incorporate the elements within block 2.
