GaAs 0.5 dB NF dual-loop negative-feedback broadband low-noise amplifier IC

Abstract

A GaAs dual-loop negative-feedback low-noise amplifier (LNA) designed for the square kilometre array is presented. Effects of transformer non-idealities on LNA performance are discussed. The LNA has 0.5 dB noise figure and À10 dB input return loss from 0.6 to 1.6 GHz.

Evaluation of Tuner-Based Noise-Parameter Extraction Methods for Very Low Noise Amplifiers

“…Step 4: DUT Measurement: When the receiver noise parameters are known, the DUT is inserted and the tuner is again manipulated to present a set of impedances to the DUT input. For each impedance, system -factors are calculated from measured noise powers by (28) The measured noise powers used to define the -factors in (28) consist of known quantities as shown in Appendix II-D and the unknown that are related through DUT noise parameters. Rearranging the expanded version of (28) shown in (B.10), one obtains (29) where (30) The effective ENR of the system is then 30) and ( 31) and are based on measured through (28).…”

“…For each impedance, system -factors are calculated from measured noise powers by (28) The measured noise powers used to define the -factors in (28) consist of known quantities as shown in Appendix II-D and the unknown that are related through DUT noise parameters. Rearranging the expanded version of (28) shown in (B.10), one obtains (29) where (30) The effective ENR of the system is then 30) and ( 31) and are based on measured through (28). Having found and and by substituting the general expression of the noise factor shown in ( 10) into ( 29), the noise parameters of the DUT are found by fitting the resultant expressions to measured data [11].…”

“…where receiver-input referred noise powers when driven by the DUTs are obtained from the noise parameters determined during the receiver calibration, and are the DUT available gains as in (A.4). In (28), the unknown are related through DUT noise parameters.…”

Non-Invasive Devices for Early Detection of Breast Tissue Oncological Abnormalities Using Microwave Radio Thermometry

“…Low-noise amplifiers determine the overall noise performance of the receivers. Very wideband performance has been demonstrated in GaAs and CMOS technologies, respectively (Nosal, 2001;Jung et al, 2006;Xu et al, 2005& Wang et al, 2005. However, in most cases a noise figure NF>1.0 dB over a frequency range of DC -10 GHz has been achieved.…”

Comparison of LNAs fabricated in 65-nm CMOS GP and LP processes for the Square Kilometre Array

“…GaAs and InP semiconductor technologies, cryogenically cooled or not, are the de facto standard technologies associated with radio astronomygrade LNAs [1,2,3]. Recently, however, CMOS and BiCMOS technologies have been investigated to replace GaAs and InP [4,5].…”