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50Ω 20dB Gain Block Delivers 46dBm OIP3 & 2.6dB NF with Bandwidth from 20MHz to 2GHz

Apr 14 2014 - MILPITAS, CA
  • 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.

    The LTC6431-20 comes in a 4mm × 4mm QFN package. Powered from a single 5V supply at 93mA supply current, the LTC6431-20 consumes low power. The A-grade version is priced starting at $4.89 each, and the B-grade version starts at $1.89 each in 1,000-piece quantities. Both devices are available from stock. For more information, visit

    Summary of Features: LTC6431-20

    • Operating Frequency: 20MHz to 2GHz
    • Outpit IP3: 46.2dBm@240MHz
    • Power Gain: 20.8dB
    • Noise Figure (NF): 2.6dB
    • Output P1dB: 22dBm
    • Low Power: 5V/93mA

    High Linearity 20dB Gain Block

    LTC6431-20 PR Image
  • About Analog Devices
  • Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices is included in the S&P 500 Index.
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