ERA-5XSM+
ERA-5XSM
Monolithic InGaP HBT MMIC Amplifier
Evaluation Board and Circuit
(Note 2)
CURRENT
REGULATOR
(Note 1)
R1
R2
R3
RBIAS
R4
(Note 1)
2
1
3
Q1
(Note 4)
R5
C3
C1
C2
C1
C2
(Note 3)
(Note 3)
Schematic Diagram
ERA-05TB
BOM of Evaluation Board
Component
Value
Function
A1
ERA-5XSM
2400 pF
2400 pF
0.1 µF
Device Under Test
DC Blocking (C block)
DC Blocking (C block)
RF bypass
C1 (Note 5)
C2 (Note 5)
C bypass (C3)
R1 (Note 2)
39.2 ohms
Sets bias current Ibias
R2 (Note 2)
39.2 ohms
Not used
Sets bias current Ibias
R3
R4
Sets bias current Ibias
Enables low frequency performance.
64.9 ohms
Sets bias current in the absence of the
current regulator
R5
Q1
64.9 ohms
LM317MABDTRK
Voltage Regulator, along with R1, R2, R3
works as constant current source
RFC (T1)
Mini-Circuits TCCH-80
RF choke (50 MHz to 8.2 GHz)
Notes:
1. Vcc may be any voltage from +12 to +24V
2. Parallel combination of R1, R2, R3 (sets bias current). Each is a 0805-size chip rated at 1/8W.
3. SMA Female connectors
4. PCB material: Rogers RO4350 or equivalent, dielectric constant=3.5, dielectric thickness= .030 inch.
5. Capacitors, C1&C2 should be free of resonance up to the highest frequency specified.
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