Atec Keithley-2820 - Manual (Page 2)

www.keithley.com
1.888.KEITHLEY
(U.S. only)
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Innovative architecture
The Model 2820’s software-defined radio architecture allows it to analyze and demodulate virtually
any signal up to 40MHz bandwidth without needing to upgrade hardware. This provides high flex-
ibility in R&D and production environments and reduces capital equipment cost. Unlike traditional
instrument architectures, this DSP-based SDR architecture combines the ability to measure the sig-
nals produced by current devices with the adaptability to handle signals future devices will produce,
so the instrument remains productive over a longer period.
When an RF signal is input to the Model 2820, it’s down-converted to an intermediate frequency
(IF), digitized by a fast, high resolution analog-to-digital converter (ADC), and routed into the wave-
form memory. The high speed DSP analyzes and demodulates the signal waveform. That means the
instrument’s RF signal analysis capability is defined through DSP software rather than in hardware.
The DSP can switch rapidly between various optional signal analysis personalities. Alternatively,
the signal’s I-Q data pairs can be output to an external PC for analysis.
A 100MHz fixed-rate ADC and a fixed-bandwidth, brick-wall, anti-alias filter combine to ensure high
signal integrity by reducing alias spurs. The Digital Up/Down Converter (DUC/DDC) compresses and
decompresses waveforms, which allows multiple signal sampling rates, conserves waveform memory
space, and speeds signal processing. The instrument’s Field-Programmable Gate Array (FPGA)
supports fast triggering and high speed signal conditioning and routing.
D S P
A D C
RF
Output
Section
RF Input
40MHz BW
Waveform
Memory
Digital Up/Down
Converter
µP
Host
Graphics Display
and User Interface
Windows CE
External PC
Interface Bus
(LAN, USB, or GPIB via SCPI
LXI Class C)
ADC
500MHz
DSP
DDC/
DUC
FPGA
100MHz
14 bits
32MSamples
DDS Synthesizer
Electronic Attenuator
~1ms Tune Time
RF Hardware
Control
The key components of the Model 2820’s DSP-based software-defined radio architecture are
optimized for high accuracy and speed while reducing instrument cost and size.
Keithley application
SW or your SW
(e.g., MATLAB, LabVIEW ® )
Keithley application
SW or your SW
(e.g., MATLAB, LabVIEW ® )
Keithley Series 2900 VSG
20, 40, or 80MHz bandwidth
100MSample memory
Arbitrary waveform generator
Keithley Series 2800 VSA
40MHz bandwidth
32MSample memory
High-speed receiver
I-Q Data I-Q Data Rx
Tx
RF In RF Out
Device
Under Test
Embedded
Signal Creation
Applications
Embedded
Signal Measurement
Applications
400MHz–6GHz
10MHz–6GHz
Keithley’s Series 2800 RF vector Signal analyzers and Series 2900 RF vector Signal Generators
are engineered for operating versatility. Use built-in application personalities and download
results, or upload and download I-Q waveform data from a connected Pc.
ordering Information
2820 RF vector Signal
analyzer
configuration choices (Specify
one from each group in the format
2820-xx-yy-zzz)
Example: 2820-FP-BT-006
RF connector Location (-xx):
-FP Front-panel RF input
-RP Rear-panel RF input
Use configuration (-yy)
-BT Bench-top
-RK Rack-mount
Frequency Range (-zzz):
-004 400MHz to 4GHz
-006 400MHz to 6GHz
options
2820-cDMa-R
cdma2000 and IS-95a reverse-
link signal analysis personality
2820-GSM
GSM, GPRS, and EDGE signal
analysis personality
2820-wcDMa-D
w-cDMa FDD downlink
signal analysis personality
2820-wcDMa-U
w-cDMa FDD uplink signal
analysis personality
2820-80211
wLaN 810.11a, b, g,
j, and n-SISo signal
analysis personality
optional Software
280111 wLaN 810.11n MIMo
signal analysis software
accessories Supplied
ac power cable
Printed Quick Start Guide
cD-RoM containing 2820 vSa
System Help, utility programs,
and PDF files (also available
on-line at www.keithley.com)
on-board help system
2820 RF Vector Signal Analyzer
400MHz to 4GHz or 6GHz
SERvIcES avaILaBLE
2820-3Y-EW 1-year factory warranty extended to 3 years
from date of shipment
C/2820-3Y-DATA 3 (Z540-1 compliant) calibrations within
3 years of purchase*
* Not available in all countries
)