Abstract
This paper proposes a 110% relative bandwidth (RBW) low-noise amplifier (LNA) for broadband receivers with flat gain, low noise and high linearity. Bias and parasitic parameters derived wide bandpass (BPDWB) matching networks and a cascode with dual feedbacks are introduced for broadband performance. Matching network design procedures are demonstrated, and results show that the frequency response of the network fits the target impedance well from 1 GHz to 3.5 GHz. The proposed BPDWB network improves the design efficiency and enhances the prediction accuracy of impedance matching. The proposed LNA in 0.25 μm GaAs pseudomorphic high electron mobility transistor (GaAs pHEMT) technology realizes a minimum NF of 0.45 dB at 1.6 GHz where the NF is less than 0.55 dB within the operating frequency band. A flat gain of 22.5–25.2 dB is achieved with the input voltage standing wave ratio (VSWR) below 1.22 and output VSWR less than 2.5. In addition, the proposed LNA has good linearity where the output third-order intercept point (OIP3) is better than +31.5 dBm, and the output 1 dB compression point (OP1dB) is better than +19 dBm over the wide frequency range.
Highlights
Modern wireless communication systems are rapidly developing in the direction of multi-carrier, large-capacity and high-speed information transmission
In response to various RF applications, wideband low-noise amplifier (LNA) handle multiple operating frequencies within a limited chip area, which greatly improves the integration of the RF front-end and plays an important role in many applications such as mobile communications, CATV, satellite navigation, and so on [6,7,8]
To achieve a balanced performance, the wideband LNA needs to compromise on the strict specifications in a large frequency range, usually several GHz
Summary
Modern wireless communication systems are rapidly developing in the direction of multi-carrier, large-capacity and high-speed information transmission. In [9], a bandwidth-enhanced Darlington amplifier with shunt feedback is adopted to implement a broadband amplifier with flat gain. In [9], a bandwidth-enhanced Darlington am2polfi fier with shunt feedback is adopted to implement a broadband amplifier with flat gain. Cascode with Dual Feedbacks Linearity and gain are two opposing poles that are difficult to balance, and if we try to improve one, it automatically reduces the other [22]. In this paper, this problem is alleviated by the cascode with feedbacks.
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