EP1S20F780I6N Altera, EP1S20F780I6N Datasheet - Page 612

• 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

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