ANALOG DEVICES UG-2110 Low Noise Amplifier with Bypass Switches User Guide
- June 16, 2024
- Analog Devices
Table of Contents
User Guide | EVAL-ADL8112
UG-2110
Evaluating the ADL8112 Low Noise Amplifier with Bypass Switches, 10 MHz to 26.5 GHz
FEATURES
- 4-layer, Rogers 4350B and Isola 370HR evaluation board
- End launch, 2.92 mm RF connectors
- Through calibration path (depopulated)
EVALUATION KIT CONTENTS
- ADL8112-EVALZ evaluation board
EQUIPMENT NEEDED
- RF signal generator
- RF spectrum analyzer
- RF network analyzer
- 8.5 V, 300 mA power supply
- +3.3 V and −3.3 V, 100 mA power supplies
GENERAL DESCRIPTION
The ADL8112-EVALZ is a 4-layer printed circuit board (PCB) fabricated from 10
mil thick, Rogers 4350B and Isola 370HR, copper clad, forming a nominal
thickness of 62 mils. The RFIN and RFOUT ports on the ADL8112-EVALZ are
populated with 2.92 mm, female coaxial connectors, and the corresponding RF
traces have a 50 Ω characteristic impedance. The ADL8112-EVALZ is populated
with components suitable for use over the entire −40°C to +85°C operating
temperature range of the ADL8112. To calibrate board trace losses, two through
calibration paths are provided. Install RF connectors in the J5, J6, J11, and
J12 positions to use the through calibration paths. Refer to Table 1 and
Figure 3 for the through calibration RF path performance.
Access the ADL8112-EVALZ power supply and digital control pins through the
surface-mount technology (SMT) test point connectors, VDD_PA, GND, VDD_SW,
VSS_SW, VA, and VB. The RF traces on the ADL8112-EVALZ are 50 Ω, grounded,
coplanar waveguides. The package ground leads and the exposed pad connect
directly to the ground plane. Multiple vias connect the top and bottom ground
planes with particular focus on the area directly beneath the ground paddle to
provide adequate electrical conduction and thermal conduction to the
ADL8112-EVALZ. Figure 4 shows the ADL8112-EVALZ schematic and configuration
used to characterize and qualify the device. For full details on the ADL8112,
see the ADL8112 data sheet, which must be consulted in conjunction with this
user guide when using the ADL8112-EVALZ.
EVALUATION BOARD PHOTOGRAPHS
REVISION HISTORY
4/2023—Revision 0: Initial Version
OPERATING THE ADL8112-EVALZ
Connect an 8.5 V, 300 mA power supply to the VDD_PA SMT test point. Connect
the power supply ground to the GND test point. Connect a +3.3 V, 100 mA, and a
−3.3 V, 100 mA power supply to the VDD_SW and VSS_SW test points of the
ADL8112-EVALZ
to provide biasing to the VDD2 and VSS2 pins. To enable the two digital
control input pins, VA and VB, connect either 0 V or 3.3 V. Refer to the
ADL8112 data sheet for the recommended resistor values to achieve different
supply currents. The default value of the external resistor, R1, connected on
the ADL8112-EVALZ is 332 Ω, which is the same value used to characterize the
ADL8112. The following bias conditions are recommended to achieve the
performance specified in the ADL8112 data sheet:
- VDD1 = 8.5 V
- Total supply current (IDQ) = 90 mA
- Bias resistance (RBIAS) = 332 Ω
RECOMMENDED BIAS SEQUENCING
During Power-Up
To power up the ADL8112-EVALZ, take the following bias sequencing steps:
- Set the VDD2 supply to 3.3 V.
- Set the VSS2 supply to −3.3 V.
- Set the VDD1 supply to 8.5 V.
- Apply the RF input signal.
During Power-Down
To power down the ADL8112-EVALZ, take the following bias sequencing steps:
- Turn off the RF input signal.
- Set the VDD1 supply to 0 V.
- Set the VSS2 supply to 0 V.
- Set the VDD2 supply to 0 V.
EVALUATION BOARD SCHEMATIC AND ARTWORK
ORDERING INFORMATION
BILL OF MATERIALS
Table 2. Bill of Materials
| Reference Designator | Description | Manufacturer | Part Number |
|---|
C1
VDD_PA, GND, VDD_SW, VSS_SW
J1 RFIN, J2 RFOUT, J7 OUT_A, J8 IN_A, J9 OUT_B,
J10 IN_B
J6, J5, J11, J12
R1| Capacitor, ceramic, 10 pF, 25 V, 5%, C0G, 0201
Connectors, SMT test points
Connectors, 2.92 mm, jack edge
Connectors, 2.92 mm, jack edge (not installed)
Resistor, 332 Ω, 1%, 1/16 W, 0402| Murata
Keystone Electronics
SRI Connector Gage Co.
SRI Connector Gage Co.
VENKEL| GRM0335C1E100JA01D
5016
25-146-1000-92
25-146-1000-92
CR0402-16W-3320FT
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.
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