EP1S20F780I6N Altera, EP1S20F780I6N Datasheet - Page 612
EP1S20F780I6N
Manufacturer Part Number
EP1S20F780I6N
Description
IC STRATIX FPGA 20K LE 780-FBGA
Manufacturer
Altera
Series
Stratix®r
Specifications of EP1S20F780I6N
Number Of Logic Elements/cells
18460
Number Of Labs/clbs
1846
Total Ram Bits
1669248
Number Of I /o
586
Voltage - Supply
1.425 V ~ 1.575 V
Mounting Type
Surface Mount
Operating Temperature
-40°C ~ 100°C
Package / Case
780-FBGA
Family Name
Stratix
Number Of Logic Blocks/elements
18460
# I/os (max)
586
Frequency (max)
450.05MHz
Process Technology
0.13um (CMOS)
Operating Supply Voltage (typ)
1.5V
Logic Cells
18460
Ram Bits
1669248
Operating Supply Voltage (min)
1.425V
Operating Supply Voltage (max)
1.575V
Operating Temp Range
-40C to 100C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
780
Package Type
FC-FBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Number Of Gates
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
EP1S20F780I6N
Manufacturer:
ALTERA
Quantity:
3 000
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Infinite Impulse Response (IIR) Filters
Infinite Impulse
Response (IIR)
Filters
7–34
Stratix Device Handbook, Volume 2
Another class of digital filters are IIR filters. These are recursive filters
where the current output is dependent on previous outputs. In order to
maintain stability in an IIR filter, careful design consideration must be
given, especially to the effects of word-length to avoid unbounded
conditions. The following section discusses the general theory and
applications behind IIR Filters.
IIR Filter Background
The impulse response of an IIR filter extends for an infinite amount of
time because their output is based on feedback from previous outputs.
The general expression for IIR filters is:
where a
feedback path, respectively, and n represents the filter order. These
coefficients determine where the poles and zeros of the IIR filter lie.
Consequently, they also determine how the filter functions (i.e., cut-off
frequencies, band pass, low pass, etc.).
The feedback feature makes IIR filters useful in high data throughput
applications that require low hardware usage. However, feedback also
introduces complications and caution must be taken to make sure these
filters are not exposed to situations in which they may become unstable.
The complications include phase distortion and finite word length effects,
but these can be overcome by ensuring that the filter always operates
within its intended range.
Figure 7–20
y n
i
and b
=
shows a direct form II structure of an IIR filter.
i
=
n
i
0
represent the coefficients in the feed-forward path and
a i x n i –
–
i
=
n
1
b i y n i –
Altera Corporation
September 2004
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