The F1455 is a High-Gain / High-Linearity 1400MHz to 2300MHz TX Variable Gain Amplifier used in transmitter applications. The F1455 TX VGA provides 32dB maximum gain with +39dBm OIP3 and 4dB noise figure. Up to 29.5dB gain control is achieved using the combination of a digital step attenuator (DSA) plus KLIN™ RF variable gain amplifier gain adjustment. This device uses a single 5V supply and 216mA of ICC. This device is packaged in a 6 x 6 mm, 28-QFN with 50Ω single-ended RF input and RF output impedances for ease of integration into the signal path.


  • Broadband 1400MHz to 2300MHz
  • 32dB max gain
  • 4dB NF at max gain (2000MHz)
  • KLIN™ amplifier with 6dB gain range
  • DSA: 23.5dB range
  • 29.5dB total gain control range, 0.5dB step
  • < 2 dB overshoot between major gain transitions such as 15.5dB to 16dB atten
  • +40dBm OIP3
  • Maintains +23.5dBm output P1dB over first 6dB gain adjustment range
  • SPI interface for DSA control
  • Single 5V supply voltage
  • ICC = 216mA
  • Up to +105°C TCASE operating temperature
  • 50Ω input and output impedance
  • Standby for power savings
  • Pin compatible 700MHz and 2700MHz versions
  • 6 x 6 mm, 28-QFN package




Type Title Date
Datasheet PDF 4.75 MB
Guide PDF 2.24 MB
Guide PDF 2.83 MB
Product Change Notice PDF 113 KB
Overview PDF 1.15 MB
Product Change Notice PDF 32 KB
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Constant Linearity (KLIN) RF Technology by IDT

IDT’s KLIN (constant linearity) RF technology extends both OIP3 and output 1 dB compression point (P1dBO) amplifier gain settings. This is particularly valuable in transmitter designs where the gain of the device is maintained within a normal gain setting window about 6 dB below maximum gain. 

KLIN refers to Constant High Linearity Inner Amplifiers as the gain is adjusted. This technology extends the compression performance over a wide range of input powers, and also extends output third order intercept and corresponding inner modulation distortion performance over a wide range of output powers.

This technology is particularly advantageous in transmitter designs, where the gain of the device is maintained within a normal gain setting window.

This technology applies to some of IDT's high-gain, high-linearity transmitter variable gain amplifiers (VGAs). For more information, visit: http://www.idt.com/products/rf-products/variable-gain-amplifiers-vga.