ANALOG DEVICES ADL8105-EVALZ 4 Layer Printed Circuit Board User Guide
- June 4, 2024
- Analog Devices
Table of Contents
User Guide | EVAL-ADL8105
UG-2051
Evaluating the ADL8105 Wideband, High Linearity, Low Noise Amplifier, 5 GHz to 20 GHz
FEATURES
► 4-layer Rogers 4350B and Isola 370HR evaluation board
► End launch, 2.9 mm RF connectors
► Through calibration path (depopulated)
EVALUATION KIT CONTENTS
► ADL8105-EVALZ evaluation board
EQUIPMENT NEEDED
► RF signal generator
► RF spectrum analyzer
► RF network analyzer
► 5 V, 300 mA power supply
GENERAL DESCRIPTION
The ADL8105-EVALZ consists of a 4-layer printed circuit board (PCB) fabricated from 10 mils thick, Rogers 4350B and Isola 370HR, copper clad, forming a nominal thickness of 62 mils. The RFID and RFOUT ports on the ADL8105-EVALZ are populated with 2.9 mm, female coaxial connectors, and the corresponding RF traces have a 50 Ω characteristic impedance. The ADL8105-EVALZ is populated with components suitable for use over the entire −40°C to +85°C operating temperature range of the ADL8105. To calibrate board trace losses, a thorough calibration path is provided between the J1 and J2 connectors. J1 and J2 must be populated with RF connectors to use the through calibration path. Refer to Table 1 and Figure 3 for the thorough calibration path performance. Access the ADL8105-EVALZ ground path and the VDD pin through the surface-mount technology (SMT) test point connectors, GND and VDD. A supplementary test point for VBIAS is included for simple access on the RBIAS pin (see Figure 5 for the test point locations). The RF traces on the ADL8105-EVALZ are 50 Ω, grounded, coplanar waveguide. The package ground leads and the exposed pad connect directly to the ground plane. Multiple vias connect the top and bottom ground planes with a particular focus on the area directly beneath the ground paddle to provide adequate electrical conduction and thermal conduction to the heat sink. The power supply decoupling capacitors on the ADL8105-EVALZ represent the configuration used to characterize and qualify the device. For full details on the ADL8105, see the ADL8105 data sheet, which must be consulted in conjunction with this user guide when using the ADL8105-EVALZ.
EVALUATION BOARD PHOTOGRAPHS
OPERATING THE ADL8105-EVALZ
A 5 V, 300 mA power supply is required to provide the bias to the ADL8105 when using the ADL8105-EVALZ. Connect the 5 V power supply to the SMT test points, VDD and VBIAS. Connect the ground reference to the GND test point. Refer to the ADL8105 data sheet for the recommended resistor values to achieve different supply currents. The default value of the external resistor, R2, connected to the ADL8105-EVALZ is 392 Ω, which is the same value used to characterize the ADL8105. The following bias conditions are recommended to achieve the performance specified in the ADL8105 data sheet: supply voltage (VDD) = 5 V, quiescent current (IDQ) = 90 mA, and bias resistance (RBIAS) = 392 Ω.
RECOMMENDED BIAS SEQUENCING
During Power-Up
To power up the ADL8105-EVALZ, follow this bias sequence:
- Connect the VDD power supply.
- Set the VDD supply to 5 V.
- Apply the RF input signal.
During Power-Down
To power down the ADL8105-EVALZ, follow this bias sequence:
- Turn off the RF input signal.
- Set the VDD supply to 0 V.
Figure 3.
Insertion Loss and Return Loss of the Through Calibration Path
Table 1. Insertion Loss of the Through Calibration Path
Frequency (GHz)| Insertion Loss (dB)| Input Return Loss (dB)|
Output Return Loss (dB)
---|---|---|---
4| −0.1| −26.5| −25.9
5| −0.1| −29.8| −30.9
6| −0.1| −31.9| −34.5
7| −0.1| −40.4| −44.6
8| −0.1| −35.7| −35.2
9| −0.1| −32.3| −31.0
10| −0.2| −38.4| −34.1
11| −0.2| −33.3| −35.6
12| −0.2| −26.5| −26.1
13| −0.3| −25.6| −24.3
14| −0.3| −23.0| −22.0
15| −0.4| −18.6| −18.9
16| −0.4| −17.6| −18.1
17| −0.4| −21.8| −22.0
18| −0.4| −29.8| −26.4
19| −0.5| −16.3| −16.3
20| −0.6| −13.3| −13.4
21| −0.6| −13.8| −13.9
22| −0.6| −18.9| −18.7
EVALUATION BOARD SCHEMATIC AND ARTWORK
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Reference Designator| Description| Manufacturer| Part
Number
---|---|---|---
C1| 0.01 μF capacitor, 0402, do not install (DNI)| Not applicable| Not
applicable
C2| 100 pF capacitor, 0402 (DNI)| Not applicable| Not applicable
C3| 100 pF ceramic capacitor, 50 V, 5%, C0G, 0402| TDK Corporation|
C1005NP01H101J050BA
C4| 0.01 μF ceramic capacitor, 25 V, 10%, X8R, 0402| TDK Corporation|
C1005X8R1E103K
C5| 1 μF capacitor, 0402 (DNI)| Not applicable| Not applicable
RFIN, RFOUT| Connectors, 2.9 mm, jack edge| SRI Connector Gage Co.|
25-146-1000-92
VDD, GND, VBIAS| Connectors, SMT test points| Keystone Electronics| 5016
J1, J2| Connectors, 2.9 mm, jack edge, not installed (NI)| SRI Connector Gage
Co.| 25-146-1000-92
R2| 392 Ω resistor, surface-mount device (SMD), 1%, 1/10 W, 0402| Panasonic|
ERJ-2RKF3920X
U1| Gallium arsenide (GaAs), pseudomorphic high electron mobility transistor
(pHEMT), monolithic microwave integrated ircuit (MMIC), 5 GHz to 20 GHz|
Analog Devices, Inc.| ADL8105
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit
boards can discharge without detection. Although this product features
patented or proprietary protection circuitry, damage may occur on devices
subjected to high-energy ESD. Therefore, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools,
components documentation or support materials, the “Evaluation Board”), you
are agreeing to be bound by the terms and conditions set forth below
(“Agreement”) unless you have purchased the Evaluation Board, in which case
the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not
use the Evaluation Board until you have read and agreed to the Agreement. Your
use of the Evaluation Board shall signify your acceptance of the Agreement.
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Inc. (“ADI”), with its principal place of business at Subject to the terms and
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license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. The customer
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Documents / Resources
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ANALOG DEVICES ADL8105-EVALZ 4 Layer Printed Circuit
Board
[pdf] User Guide
ADL8105-EVALZ, 4 Layer Printed Circuit Board, ADL8105-EVALZ 4 Layer Printed
Circuit Board
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References
- Mixed-signal and digital signal processing ICs | Analog Devices
- EVAL-ADL8105 Evaluation Board | Analog Devices
- ADL8105 Datasheet and Product Info | Analog Devices