A novel cascode feedback GaAs MMIC LNA with transformer-coupled output using multiple fabrication processes

Ultra‐wideband low noise amplifier using a cascode feedback topology

“…The resistive and capacitive shunt feedback (R f , C f ) are employed to produce the better stability, gain flatness, and bandwidth. The large values of feedback resistors (700⍀-1100⍀) also improve the input impedance matching, without affecting the noise figure significantly [2].…”

“…In this paper, a broadband CMOS LNA is proposed with a cascode feedback topology and broadband-matching techniques, which meets requirements of multiband OFDM UWB systems in noise and bandwidth simultaneously [2]. The design principles and the measurement results of the implemented UWB LNA are described.…”

“…Cylindrical single-mode applicators employing the TM 01l mode [1] find practical use in microwave power engineering for thermal treatment of optical fibers [2], liquid media [3], food stuffs [4], and other substances of axially symmetric geometry. Although underlying theoretical aspects of wave propagation in circular axially loaded waveguides have been described in literature (for example, [3][4][5][6]), full-wave numerical analysis is essential for competent design of practical devices [7].…”

A Novel 2.4GHz CMOS Low Nose Amplifier Based on Cascode Feekback Topology

“…Since both the input impedance of the common-gate stage and the output impedance of the common-source stage are capacitive, it is desirable to add a series inductor La between the two stages to improve the matching. Since power gain is improved by adding this inductor, the Miller capacitance effect will be more significant in the first stage, and the overall noise figure will be improved thanks to better power transfer [5] [6]. In order to reduce the Miller capacitance effect, a negative-feedback circuit is introduced as in Fig.1.…”

“…Cf works as a dc blocking capacitor, shorted at high frequency. Due to the fact that the output impedance of cascade structure of NMOS amplifier is much bigger, Rf should be set large enough, usually more than 900ohm~1100ohm, so that the bandwidth is increased while keeping the noise factor unchanged [6] [7].…”