Linear Technology has introduced the LTC6431-20, a 20 MHz to 2 GHz single-ended input and output fixed gain amplifier with 46.2dBm OIP3 (Output Third Order Intercept) and 2.6 dB noise figure. It has a OP1dB (Output 1dB Compression Point) of 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 matched to 50 Ohms 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.
The amplifier has been 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 pre-distortion 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 is available in a 4mm x 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.
