1. 2’ x 4’ Plates readout
Jean-Francois Genat
March 24th 2009

2. 2’ x 4’ plates and readout 96 T-lines at ¼” pitch
Sampling
chips
FPGA
96 T-lines at ¼” pitch
Assume 16-channel readout chips
6 chips at each side
Transverse resolution > 1.8mm, any longitudinal > .5mm
Clock distribution
Optical output
Jean-Francois Genat

3. Microstrip line Z0 Depends mainly on W/h
Depends mainly on W/h
Differential impedance depends mainly on s/h
Zdiff = 2 * Zo ( 1 – 0.48 e-0.96s/h )
Jean-Francois Genat

4. Dielectric constant Trace width vs relative permittivity
Z=50 Ohms, Glass thicknesses = 1 and 2mm
Jean-Francois Genat

5. Examples e = 4.5 W=1.85mm Z=50W t=35m h=1mm
Relative differential impedance (50W/Zdiff)
See Tang’s slides on long lines crosstalk
Jean-Francois Genat

6. T-line on glass Not as much experienced as ceramics Dielectric er
Tan d
Ceramic
4-5
1e-4 / 1e-3
PbO5 Glass
4 /15
1e-4 / 5e-3
GaAs 13
6e-4
Jean-Francois Genat