Pentek 6210 Operating Manual page 60

f
S
5MHz
f' /8
S
5MHz
FIGURE 6. INTERPOLATION SPECTRUM: INTERPOLATE BY 8 THE INPUT DATA WITH ZERO STUFFING; SAMPLE AT RATE R = f's
4MHz
O.5MHz
FIGURE 7. ALIAS PROFILE AND THE 85dB DYNAMIC RANGE BANDWIDTH
3-12
HSP50214B
2f 3f 4f
S S S
10MHz 15MHz 20MHz
THE INPUT DATA SPECTRUM SAMPLED AT RATE R = f
f' /4 3f' /8 f' /2
S S S
10MHz 15MHz 20MHz
8MHz 12MHz 16MHz 20MHz 24MHz 28MHz 32MHz 36MHz 40MHz
DECIMATE BY 10 AND CIC FILTER; SAMPLE AT RATE R = f's/10
85dB DYNAMIC RANGE BANDWIDTH
CIC FILTER ALIAS PROFILE
1MHz 2MHz
µPROC
DAC
IF
INPUT
GCA
FIGURE 8. PROCESSOR BASED EXTERNAL IF AGC
5f 6f 7f
S S S
25MHz 30MHz 35MHz
5f' /8 3f' /4 7f' /8
S S S
25MHz 30MHz 35MHz
3MHz
INPUT LEVEL
DETECTOR (24-BIT
ERROR VALUE)
THRESH
A/D
PDC
8f 9f 10f
S S S
40MHz 45MHz 50MHz
S
f'
S
40MHz
CIC FILTER
FREQUENCY
RESPONSE
4MHz