Radio-Astronomy LNA Boasts Noise Figure Under 0.2 dB

Jan. 23, 2008
THE SQUARE KILOMETER ARRAY (SKA) radio synthesis telescope is estimated to require millions of receivers. To keep receiver cost down, CMOS technology is being looked at as an option. With recent improvements in CMOS transistors, this technology ...

THE SQUARE KILOMETER ARRAY (SKA) radio synthesis telescope is estimated to require millions of receivers. To keep receiver cost down, CMOS technology is being looked at as an option. With recent improvements in CMOS transistors, this technology can even achieve the low noise figures needed in radio astronomy. At the University of Calgary's (Calgary, Canada) Department of Electrical and Computer Engineering, Leonid Belostotski and James W. Haslett have achieved sub-0.35-dB noise figures. The researchers assert that those figures can be further improved by designing a low-noise amplifier (LNA) for the telescope antenna with non-50-O port impedance. Power-constrained optimization should be used as well.

Essentially, the noise-figure optimization procedure determines the signal-source resistance that results in the reduced noise figure. The LNA, which is designed in 90-nm bulk CMOS, achieves a sub-0.2-dB noise figure from 800 to 1400 MHz. It also flaunts return loss of more than 11 dB, gain of more than 17 dB driven into a 50-O load, and an output 1-dB compression point of +2 dBm. While consuming 43 mA from a 1-V supply, the output third-order intercept point is +12 dBm. The output second-order intercept point is +22 dBm.

To achieve the best noise figure, an SKA LNA optimization must be done in conjunction with the design of the circuit board on which the LNA will be mounted. In this LNA implementation, the load choke inductor and source inductor are integrated. See "Sub-0.2 dB Noise Figure Wideband Room-Temperature CMOS LNA With Non-50-O Signal Source Impedance," IEEE Journal of Solid-State Circuits, Nov. 2007, p. 2492.

Sponsored Recommendations

Request a free Micro 3D Printed sample part

April 11, 2024
The best way to understand the part quality we can achieve is by seeing it first-hand. Request a free 3D printed high-precision sample part.

Request a quote: Micro 3D Printed Part or microArch micro-precision 3D printers

April 11, 2024
See the results for yourself! We'll print a benchmark part so that you can assess our quality. Just send us your file and we'll get to work.

Designing Wireless Modular Robots Using Advanced 3D Printing Precision

March 28, 2024
Learn how researchers at Southern Methodist University used 3D printing to fabricate wireless modular robots.

Microelectromechanical 3D Printing Resources

March 28, 2024
Check out our curated list of microelectromechanical 3D printing resources and see how PµSL technology offers freedom and speed.