A high linear broadband cascode LNA employing common-gate linearity enhancing technology

Zhang, Zhichao; Khan, Muhammad R.; Dinh, Anh; Chen, Li

doi:10.1587/elex.10.20130603

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…2, which is similar to the analysis that we proposed in [6]. The drain current of the CG stage M2 can be expressed as…”

Section: Introductionsupporting

confidence: 62%

“…However, at high frequencies, both the nonlinearity and noise contributions coming from the CG stage increase because of the parasitic capacitance and cannot be ignored. In [6], we proposed a linear technique to improve the linearity of the CS and CG stages respectively, but a frequency range improvement is still required for wideband applications. In this paper, a linearization technique is proposed to improve the linearity performance of the wideband cascode LNAs.…”

Section: Introductionmentioning

confidence: 99%

“…2.2 Proposed linearization method and structure of the wideband LNA As analyzed in our previous design [6], the cascode structure can be taken as a twostage CS-CG amplifier. Therefore the linearity of the two stages can be optimized independently to obtain two IIP3 peaks at lower and higher frequency corners, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Wide range linearity improvement technique for linear wideband LNA

Zhang¹,

Dinh

Chen

et al. 2017

IEICE Electron. Express

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This paper proposes a wideband linearity improvement technique for the CS-CG cascode structure in the Low-Noise Amplifier (LNA), in which the linearity of both CS and CG stages are improved simultaneously. At relatively low frequencies, the noise and nonlinearity contributions mainly come from the CS stage and a post-distortion method is adopted to eliminate the third-order harmonic. As the frequency increases, the nonlinearity and noise contribution of the CG stage becomes more severe due to its parasitic capacitances. A transformer feedback structure is proposed to increase the gain and reduce the noise, thereby improving the linearity of the CG stage. The linearization technique is applied to an ultra-wideband (UWB) cascode LNA to evaluate effectiveness. The designed LNA achieves a S11 of less than −10 dB in a wide frequency range of 2.1-7.6 GHz and a gain of more than 10 dB with a peak of 11.7 dB. Over this range, a minimum NF of 3.4 dB and a relatively high IIP3 of greater than 10 dBm with a 15.7 dBm peak are achieved. The results indicate that the proposed technique effectively improves the linearity of the cascode LNA in a wide range of frequencies. At the same time, NF and gain performance are also improved.

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“…2, which is similar to the analysis that we proposed in [6]. The drain current of the CG stage M2 can be expressed as…”

Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%