Linear Technology DC2070A Quick setup guide

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DEMO MANUAL DC2070A
Description
LTC5577
300MHz to 4GHz
High Signal Level Active
Downconverting Mixer
DemonstrationcircuitDC2070Aisoptimizedfor evaluation
of the LT C
®
5577 high signal level active downconverting
mixer. Its RF input port is matched to 50Ω from 1.3GHz to
4.3GHz with 12dB return loss, and the LO port is matched
to 50Ω from 950MHz to 4.1GHz with 10dB return loss.
The RF and LO inputs are easily matched for higher or
lower frequencies with simple external matching, as low
as350MHz and 300MHz, respectively. The low capacitance
differential IF output is usable up to 1.5GHz. The LTC5577
active mixer is optimized for RF downconverting applica-
tions that require high input signal handling capability and
wide bandwidth.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Figure 1. Test Setup for Mixer 2-Tone Measurements
Absolute MAxiMuM input
rAtings
Supply Voltage (VCC, IF+, IF–).....................................4V
Enable Input Voltage (EN)................–0.3V to VCC + 0.3V
LO Input Power (350MHz to 4.5GHz)...................10dBm
LO Input DC Voltage............................................... ±0.1V
RF Input Power (300MHz to 4GHz)......................18dBm
RF Input DC Voltage............................................... ±0.1V
TEMP Monitor Input Current..................................10mA
Operating Temperature Range (TC)........ –40°C to 105°C
Junction Temperature (TJ).................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
CAUTION: THIS PART IS SENSITIVE TO ELECTRO-
STATIC DISCHARGE (ESD). OBSERVE PROPER ESD
PRECAUTIONS WHEN HANDLING THE LTC5577.
boArD photo

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DEMO MANUAL DC2070A
notes on test equipMent AnD setup
quick stArt proceDure
n High performance signal generators with low harmonic
outputs should be used for 2-tone measurements.
Otherwise, low pass filters at the signal generator out-
puts should be used to suppress harmonics.
n High quality combiners should be used to present a
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.
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.
n Spectrum analyzers can produce significant internal
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.
n Before performing measurements on the DUT, the
system performance should be evaluated to ensure that
a clean input signal is obtained and that the spectrum
analyzer’s internal distortion is minimized
3. Ramp on the power supply with a minimum ramp time
of 1ms.
4. Set the LO signal generator to provide an 1800MHz
CW signal at about 0dBm at the DC2070A’s LO port.
pArts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 4 C1, C2, C7, C8 CAP, 1nF, 10%, 16V, X7R, 0402 MURATA, GRM155R71C102KA01D
2 1 C3 CAP, 8.2pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H8R2CA01D
3 1 C4 CAP, 0.7pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1HR70BB01D
4 1 C5 CAP, 3.9pF, ±0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H3R9BB01D
5 0 R3, L4, L5, L6, C6, C10, C11,
C12, C13
COMP, 0402, OPT 0402
6 1 C9 CAP, 1µF, 10%, 10V, X7R, 0603 MURATA, GRM188R61A105KA61D
7 3 E1, E3, E4 TURRET, PAD, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
8 1 E2 TURRET, PAD, 0.061" MILL-MAX, 2308-2-00-80-00-00-07-0
9 4 J1-J4 CONN, SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851
10 2 L1, L2 IND, 560nH, 2%, 0603 COILCRAFT, 0603LS-561XGL
11 2 R1, R2 RES, CHIP, 115, 1%, 0402 VISHAY, CRCW0402115RFKED
12 1 U1 IC, LINEAR TECHNOLOGY, LTC5577IUF,
QFN16, 4×4
LINEAR TECHNOLOGY, LTC5577IUF

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DEMO MANUAL DC2070A
scheMAtic DiAgrAM
Figure 2. High Signal Level Active Mixer
5. Set the two RF signal generators to provide one
1949MHz CW signal and one 1951MHz CW signal.
The signals should be applied to the 0° combiner. The
power applied to the DC2070A’s RF input port should
be about –3dBm/tone.
6. Perform various measurements (conversion gain, IP3,
LO leakage, etc.).
7. To turn off the DC2070A, either turn off the power sup-
ply’s output, or remove the power leads starting with
the EN lead.
quick stArt proceDure

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DEMO MANUAL DC2070A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
LT 1113 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
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in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
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If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
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