Notes On Test Equipment And Setup; Parts List; Quick Start Procedure - Analog Devices Linear Technology DC2070A Demo Manual

DEMO MANUAL DC2070A

NOTES ON TEST EQUIPMENT AND SETUP

High performance signal generators with low harmonic
n
outputs should be used for 2-tone measurements.
Otherwise, low pass filters at the signal generator out-
puts should be used to suppress harmonics.
High quality combiners should be used to present a
n
broadband 50Ω termination on all ports as well as
provide good port-to-port isolation. Attenuator pads
should be used on the inputs to the combiner and the RF
input port of the LTC5577 mixer, as shown in Figure 1.
Adding attenuator pads further improves source iso-
lation and helps prevent the signal generators from
producing intermodulation products.

PARTS LIST

ITEM QTY REFERENCE
1 4 C1, C2, C7, C8
2 1 C3
3 1 C4
4 1 C5
5 0 R3, L4, L5, L6, C6, C10, C11,
C12, C13
6 1 C9
7 3 E1, E3, E4
8 1 E2
9 4 J1-J4
10 2 L1, L2
11 2 R1, R2
12 1 U1

QUICK START PROCEDURE

1. Set the power supply output voltage to 3.3V and the
current limit to 250mA. Turn off the power supply
output.
2. Connect all test equipment and the power supply as
shown in Figure 1.
2
Spectrum analyzers can produce significant internal
n
distortion products if they are overdriven. Generally,
spectrum analyzers are designed to operate at their
best with about –30dBm to –40dBm at their input. The
spectrum analyzer's input attenuation setting should
be used to avoid saturating the instrument. Set the
spectrum analyzer's input attenuation depending on
the spectrum analyzer used.
Before performing measurements on the DUT, the
n
system performance should be evaluated to ensure that
a clean input signal is obtained and that the spectrum
analyzer's internal distortion is minimized
PART DESCRIPTION
CAP, 1nF, 10%, 16V, X7R, 0402
CAP, 8.2pF, ±0.1pF, 50V, NPO, 0402
CAP, 0.7pF, ±0.1pF, 50V, NPO, 0402
CAP, 3.9pF, ±0.1pF, 50V, NPO, 0402
COMP, 0402, OPT
CAP, 1µF, 10%, 10V, X7R, 0603
TURRET, PAD, 0.094"
TURRET, PAD, 0.061"
CONN, SMA, 50Ω, EDGE-LAUNCH
IND, 560nH, 2%, 0603
RES, CHIP, 115, 1%, 0402
IC, LINEAR TECHNOLOGY, LTC5577IUF,
QFN16, 4×4
3. Ramp on the power supply with a minimum ramp time
4. Set the LO signal generator to provide an 1800MHz
MANUFACTURER/PART NUMBER
MURATA, GRM155R71C102KA01D
MURATA, GJM1555C1H8R2CA01D
MURATA, GJM1555C1HR70BB01D
MURATA, GJM1555C1H3R9BB01D
0402
MURATA, GRM188R61A105KA61D
MILL-MAX, 2501-2-00-80-00-00-07-0
MILL-MAX, 2308-2-00-80-00-00-07-0
E.F. JOHNSON, 142-0701-851
COILCRAFT, 0603LS-561XGL
VISHAY, CRCW0402115RFKED
LINEAR TECHNOLOGY, LTC5577IUF
of 1ms.
CW signal at about 0dBm at the DC2070A's LO port.
dc2070afa