Linear Technology announces the LTC6431-20, a 20MHz to 2GHz single-ended input and output fixed gain amplifier offering outstanding 46.2dBm OIP3 (Output Third Order Intercept) and 2.6dB noise figure. Its OP1dB (Output 1dB Compression Point) is a best-in-class 22dBm. Two grades are offered, including the A-grade version that is 100% tested and guaranteed to have a minimum of 42.2dBm OIP3 at 240MHz, and the B-grade version offering a typical OIP3 of 45.7dBm at the same frequency.
Both input and output are internally 50Ω matched from 20MHz to 1.4GHz, with a frequency response of 20dB power gain and a flatness of better than 0.5dB. Internal 50Ω matching simplifies design and enables easy cascading, using minimum external components. Each amplifier needs only an input and output DC blocking capacitor, plus a choke to bias its open collector output.
Fabricated using an advanced SiGe BiCMOS process, the LTC6431-20 offers exceptionally stable performance, while tolerating power supply voltage variations and temperature changes. The device is specified for operation over a case temperature range from -40°C to 85°C.
The LTC6431-20 is ideal for amplifying IF and RF signals in low distortion transmitters or receivers at frequencies up to 1.5GHz. It is also suitable for digital predistortion receivers whose performance depends on maintaining low distortion in the signal path.
In addition, the amplifier is excellent for a wide range of broadband and narrowband radios that operate in the VHF/UHF bands such as broadcast radios, cable networks, white space data services, low- band LTE base station infrastructure and public safety radios.
Features:
－ 50Ω Matched 20MHz to 1400MHz
－ 20.8dB Power Gain
－ 46.2dBm OIP3 at 240MHz Into 50Ω
－ NF = 2.6dB at 240MHz
－ 0.6nV/√Hz Total Input Noise
－ S11 < –10dB Up to 2.0GHz
－ S22 < –10dB Up to 1.4GHz
－ >2.0VP-P Linear Output Swing
－ P1dB = 22.0dBm
－ 50Ω Single-Ended Input/Output
－ Insensitive to VCC Variation
－ A-Grade 100% OIP3 Tested at 240MHz
－ Input/Output Internally Matched to 50Ω
－ Single 5V Supply
