Wideband Balun-LNAs using asymmetric CCC technique for WLAN and mobile WiMAX applications

Kishore, K. Hari; Venkataramani, B.; Raju, B. Kasi

doi:10.1016/j.mejo.2019.05.021

Cited by 11 publications

(6 citation statements)

References 22 publications

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“…The proposed structure outperforms the other works in terms of linearity. It is worthy to note, despite similarities the proposed LNA presents much better IIP2 performance even in the worst‐case (temperature ‐40˚C) in comparison with [7]. The power consumption of the proposed circuit is also less than the other works, except for [15, 16], which consume less power.…”

Section: Simulationmentioning

confidence: 86%

“…The IM2 cancellation feedback is introduced in [4] to enhance the IIP2 with the penalty of the output bandwidth (BW) and noise figure (NF). Some techniques such as the current reused method in [6] and an asymmetric capacitive cross‐coupled (CCC) technique in [7] are proposed to reduce the power consumption and improve the noise performance; however, the problem of asymmetric outputs remains unsolved.…”

Section: Introductionmentioning

confidence: 99%

“…To advance the benefits of both balun‐LNA and CCC methods, a CS–CG balun‐LNA with asymmetric CCC is proposed in [7] (Figure 1c). To deal with unequal output impedances, the modified asymmetric CCC is scaled proportionally to the output impedance of the preceding block.…”

Section: Introductionmentioning

confidence: 99%

“…Another issue about [7] is that, although biasing of the CS stage is not mentioned clearly, in the structure given in Figure 1c, the gate‐source voltage of M CS should be considered in the maximum supply voltage. This issue can severely limit the voltage headroom and consequently restricts the overdrive voltage of M CS .…”

Section: Introductionmentioning

confidence: 99%

“…This somewhat relaxes the overdrive voltage of the CS stage and further improves the linearity performance of the proposed structure. The higher overdrive voltage in conjunction with the balanced structure of the proposed LNA helps it to achieve superior linearity performance compared to [7].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A wideband balun‐LNA employing symmetrical CCC technique and balanced outputs

Eskandari

Ebrahimi

Baghtash

2021

IET Circuits, Devices & Syst

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The conventional active CG‐CS balun low‐noise amplifiers (LNAs) with asymmetric outputs exploit a relatively weak output balance, limited IIP2, and high power consumption. This study presents a wideband balun‐LNA with symmetrical outputs. The proposed LNA utilizes a symmetrical capacitive cross‐coupled (CCC) technique between active balun and resistor loads to achieve wideband output balancing, thereby enhancing the gain and linearity performance. In addition, double noise reduction techniques are exploited to implement symmetrical outputs, reduce power consumption, and avoid noise figure (NF) degradation. First, the common‐source (CS) stage in parallel with the common‐gate (CG) amplifier nullifies the noise of the CG transistor. Second, an Aux amplifier in the CS stage reduces the noise of the CS transistor and avoids scaling up the CS transistor with respect to the CG transistor. The proposed LNA is implemented in 0.18 μm complementary metal‐oxide semiconductor technology, and its performance is evaluated through spectre post‐layout simulations. The proposed LNA exhibits a voltage gain of 25.4 dB and an NF of 3.2–3.8 dB over 3 GHz operating bandwidth ranging from 1 to 4 GHz. The IIP3 and IIP2 are achieved as ‐1.66 dBm and +28.97 dBm, respectively. The proposed structure consumes 5.5 mW from 1.5V power supply and occupies an active area of 0.29 mm2.

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Section: Simulationmentioning

confidence: 86%