Specifications and information are subject to change without notice
TriQuint Semiconductor, Inc • Phone +1-503-615-9000 • FAX: +1-503-615-8900 • e-mail: info-sales@tqs.com • Web site: www.TriQuint.com Page 1 of 4 June 2011
WJA1021
+5V Active-Bias InGaP HBT Gain Block
Product Features
• 50 – 4000 MHz
• 17.5 dB Gain @ 1.9GHz
• +19 dBm P1dB @ 1.9GHz
• +36.5 dBm OIP3 @ 1.9GHz
• +5V Single Supply
• Low current draw (90mA)
• Unconditionally stable
• Internally matched to 50 Ω
• Robust 1000V ESD, Class 1C
• Lead-free/green/RoHS-compliant
SOT-89 package
Applications
• GSM, PCS, CDMA, WCDMA
• WiMAX, WiBro
• Repeaters, BTS Transceivers
• RFID
Product Description
The WJA1021 is a cascadable gain block that offers high
linearity in a low-cost surface-mount package. At 1.9 GHz,
the WJA1021 typically provides 17.5 dB gain, +36.5 dBm
OIP3, and +19 dBm P1dB. The device is housed in a lead-
free/green/RoHS-compliant industry-standard SOT-89
SMT package using a NiPdAu plating to eliminate the
possibility of tin whiskering.
The WJA1021 consists of Darlington pair amplifier using a
high reliability InGaP/GaAs HBT process technology.
The amplifier has been optimized internally to offer very
high linearity performance at 1.9 GHz while drawing very
low current. The MMIC amplifier is internally matched to
50Ω and only requires DC-blocking capacitors and a bias
inductor for operation. An internal active bias is designed
to enable stable performance over temperature and allow
for operation directly from a +5V supply voltage.
The broadband amplifier can be directly applied to various
current and next generation wireless technologies such as
GSM, CDMA, W-CDMA, WiBro, and WiMAX. The
WJA1021 is ideal for general purpose applications such as
LO buffering or amplification and pre-driver stages within
the 50 to 4000 MHz frequency range.
Functional Diagram
RF IN GND
GND
1
2
3
4
Function Pin No.
Input 1
Output/Bias 3
Ground 2, 4
Specifications
(1)
Parameter Units Min Typ Max
Operational Bandwidth MHz 50 4000
Test Frequency MHz 1900
Gain dB 16.1 17.5 19.1
Input Return Loss dB -15
Output Return Loss dB -10
Output P1dB dBm +19
Output IP3
(2)
dBm +33.5 +36.5
Noise Figure dB 6.3
Device Voltage V 5
Device Current mA 80 90.5 100
1. Test conditions: 25 ºC, Supply Voltage = +5 V, 50 Ω System. S-parameters and 3OIP measured at
device pins. All other specifications measured on evaluation board.
2. 3OIP measured with two tones at an output power of 4 dBm/tone separated by 1 MHz. The
suppression on the largest IM3 product is used to calculate the 3OIP using a 2:1 rule.
Absolute Maximum Rating
Parameter Rating
Storage Temperature -55 to +150
C
Supply Voltage +6.5 V
Thermal Resistance, Rth 78.8
C / W
Junction Temperature 150
C
Input Power +24 dBm
Operation of this device above any of these parameters may cause permanent damage.
Typical Performance
(3)
Parameter Units Typical
Frequency MHz 200 900 1900 2100
S21 dB 19.5 18.4 16.7 16.4
S11 dB -12 -19 -29 -25
S22 dB -20 -13 -10 -10
Output P1dB dBm +20.2 +20.1 +19 +18
Output IP3
(2)
dBm +36.9 +38.9 +36.6 +36
Noise Figure dB 5.3 5.6 6.3 6.6
3. Listed typical performance parameters measured on evaluation board.
Ordering Information
Part No. Description
WJA1021 +5V Active Bias InGaP HBT Gain Block
(lead-free/green/RoHS-compliant SOT-89 Package)
Standard tape / reel size = 1000 pieces on a 7″ reel
Not Recommended For
New Designs
Recommended replacement parts: