+5V Active-Bias InGaP HBT Gain Block
• 50 – 4000 MHz
• 17.5 dB Gain @ 1.9GHz
www.d•ata+s1h9eedtB4um.coPm1dB @ 1.9GHz
• +37.5 dBm OIP3 @ 1.9GHz
• +5V Single Supply
• Low current draw (90mA)
• Unconditionally stable
• Internally matched to 50 Ω
• Robust 1000V ESD, Class 1C
• GSM, PCS, CDMA, WCDMA
• WiMAX, WiBro
• Repeaters, BTS Transceivers
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, +37.5 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.
Typical Performance (3)
Input Return Loss
Output Return Loss
Output IP3 (2)
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 3 dBm/tone separated by 1 MHz. The
suppression on the largest IM3 product is used to calculate the 3OIP using a 2:1 rule.
Output IP3 (2)
3. Listed typical performance parameters measured on evaluation board.
Absolute Maximum Rating
Thermal Resistance, Rth
-55 to +150 °C
78.8 °C / W
+5V Active Bias InGaP HBT Gain Block
(lead-free/green/RoHS-compliant SOT-89 Package)
50 – 4000 MHz Fully Assembled Eval. Board
Operation of this device above any of these parameters may cause permanent damage.
Standard tape / reel size = 1000 pieces on a 7” reel
Specifications and information are subject to change without notice
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: firstname.lastname@example.org • Web site: www.wj.com, www.TriQuint.com
Page 1 of 4 April 2008