Correlator
12
ALMA
Project
AMAC 24-25 March 2003
Comparison of Baseline and 2GC
256
128
128
64
128,…2048
N/A
N/A
1
1
64
Baseline
4096
256,512,…8192
Spectral points @ 1 GHz BW, no cross-pol products
2048
128,256,…4096
Spectral points @ 1 GHz BW, all polarization products
2048
128,256,…4096
Spectral points @ 2 GHz BW, no cross-pol products
1024
64,128,…2048
Spectral points @ 2 GHz BW, all polarization products
32 x 384*
4096
Filter length
3-bit
2-bit
(some 4-bit modes)
Correlation
6%
None
Sub-band overlap
±2
GHz
None
Sub-band tunability
32
1,2,4,…16
Sub-bands @ 1 GHz BW
32
1,2,4,…32
Sub-bands @ 2 GHz BW
80
64
Number of Antennas
2GC
Enhanced Baseline
Parameter
* In 2-stage filters, 384 taps per
sub-band are equivalent to 2X1024 taps in a 1-stage filter