This study presents a Ka-band direct-conversion receiver using 28-nm CMOS (Complimentary Metal Oxide Semiconductor) process for radar applications. The designed includes LNA (Low-Noise Amplifier), Mixer, and Baseband amplifier. adopts two-stage cascode amplifier structure. Then, the mixer is single-balanced passive with low flicker noise. At end, baseband transimpedance fat FET (Field-Effect-tr...

The paper studies the method active constellation extension (ACE) for increasing the channel capacity of orthogonal frequency-division multiplexing (OFDM) with a nonlinear power amplifier at the transmitter. It turns out that ACE is able to optimize the capacity but at the expense of an increased out-of-band radiation. In order to solve this issue, ACE is combined with the strategy clipping and...

The MAX2530 receiver RF front-end IC, using Maxim's advanced SiGe process, was originally designed for cellular-band and PCS band operation. For 450MHz CDMA, the NF (noise figure) and the IIP3 (input third-order intercept) of the low noise amplifier (LNA) are very critical in considering the sensitivity, and the single-tone desensitization effect. This technical note gives the tuning method and...

The linearization of RF power amplifiers (PA) can benefit from the availability of the generalized Volterra coefficients characterizing its non-linear response. In this work a large-signal network analyzer is used to acquire the amplitude and phase of the 3 intermodulation terms Ym3and Ym3+ of an LDMOSFET PA. The frequency dependence and difference between Ym3and Ym3+ reveals the memory effects...

This paper presents the design and experimental results of a miniaturized monolithic 2.4/5.7 GHz concurrent dual-band low noise amplifier with cascade configuration using InGaP/GaAs HBT technology for the first time. The first stage of the LNA provides high gain and input matching simultaneously at both 2.4 GHz and 5.7 GHz bands. The output matching of the second stage is realized by shunt-shun...

This paper presented a modified low-power recovery system for implanted micro-system devices to stimulate nerves and muscles. The modified system based on ASK modulation techniques and efficient class-E power amplifier, and operated at low-frequency band 13.56 MHZ to avoid the tissue damage according to the industrial, scientific, medical (ISM) band, with low modulation index 15.6% to achieve m...

The design issues in designing low noise amplifier (LNA) for Software-Defined-Radio (SDR) are reviewed. An inductor-less wideband low noise amplifier aiming at low frequency band (0.2-2 GHz) for Software-DefinedRadio is presented. Shunt-shunt LNA with active feedback is used as the first stage which is carefully optimized for low noise and wide band applications. A digitally controlled second s...

What is a Low-Noise Amplifier? Digital signal processing (DSP) systems require interfaces to the analog world. The first amplification stage in a radio receiver is typically the tuned low-noise amplifier (LNA), which provides enough amplification to the input signal to make further signal processing insensitive to noise. Although the primary goal in LNA design is to minimize the system noise fi...