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This product note describes the characteristics, setup, and operation of a broadband
vector signal analyzer (VSA) comprised of an Agilent Acqiris U1066A (DC440, DC438)
or U1065A (DC282, DC252, DC222) high-speed digitizer and the 89600 vector signal
analyzer software. By taking advantage of the layered architecture and extensive digital
signal processing (DSP) routines of the 89600 VSA software, the digitizer becomes
a new “front end” data acquisition subsystem for the VSA. This hardware-software
combination provides up to 2 GHz of analysis bandwidth depending on the digitizer
used. See Table 1 for the supported digitizer models and the corresponding analysis
bandwidths. Appendix A contains suggestions for ultra-wideband downconverters.
The 10- and 12-bit, high sample rate analog-to-digital converter (ADC) in the Acqiris
digitizers produces the large analysis bandwidths shown in Table 1. These bandwidths
are capable of providing a spurious-free dynamic range greater than or equal to 40 dB
for the U1065A and greater than or equal to 75 dB for the U1066A. This is suffi cient for
1.5 to 2% error vector magnitude measurements in most cases. For spectrum measure-
ments with higher dynamic range, a traditional spectrum analyzer should be used.
1 Overview
Model No of
channels
Max
sample rate
Frequency
range
Default
memory
Optional
memory
U1066A-001 (DC440) 1 400 M dc – 100 MHz 4 M 8 M
U1066A-001 (DC440) 2 400 M dc – 100 MHz 4 M 8 M
U1066A-001 (DC440) HF input 1 420 M 1 MHz – 300 MHz
1
4 M 8 M
U1066A-001 (DC440) HF input 2 420 M 1 MHz – 300 MHz
1
4 M 8 M
U1066A-002 (DC438) 1 200 M dc – 78.125 MHz 4 M 8 M
U1066A-002 (DC438) 2 200 M dc – 78.125 MHz 4 M 8 M
U1065A-001 (DC222) 1 8 G dc – 2 GHz 1 M 128 M, 1 G
U1065A-002 (DC252) 1 8 G dc – 2 GHz 1 M 128 M, 1 G
U1065A-002 (DC252) 2 4 G dc – 1.5625 GHz 512 k 64 M, 512 M
U1065A-004 (DC282) 1 8 G dc – 2 GHz 1 M 128 M, 1 G
U1065A-004 (DC282) 2 4 G dc – 1.5625 GHz 512 k 64 M, 512 M
Table 1. Agilent Acqiris digitizers supported by 89600 VSA software
1. Max span = 164 MHz