Design Techniques of CMOS Ultra-Wide-Band Amplifiers for Multistandard Communications

Tsang, T.K.K.; Lin, Kuan‐Yu; El-Gamal, M.N.

doi:10.1109/tcsii.2008.918925

Cited by 27 publications

(25 citation statements)

References 11 publications

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“…Traditionally, the common-gate topology is known to have higher NF than that of the common-source or cascode. Current reuse LNA in [10] The Noise Figure (NF) of the CG LNA [16] depends on the device size and process parameters, it remains almost constant with frequency. Also, the NF of the CG LNA has a strong coupling with the bias point, or, in other words, the input matching resistance looking into the source.…”

Section: Literature Surveymentioning

confidence: 99%

Design and Performance Measure of 5.4 GHZ CMOS Low Noise Amplifier Using Current Reuse Technique in 0.18μm Technology

Shankar¹,

dhas²

2015

Procedia Computer Science

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A two stage CS-CS low noise amplifier (LNA) centered at 5.4 GHz with a minimum noise figure (NF) 0.423 over a band width of 100MHz is proposed. The current reuse technique is used to construct the main amplifier and LNA is tuned to that particular frequency using the resonant circuit. The designed LNA obtains a gain of 12.554dB, input reflection coefficient of -23.847dB, output reflection coefficient of -17.479dB, reverse isolation of -20.458dB and stability factor of 1.425.

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Section: Literature Surveymentioning

confidence: 99%

Design and Performance Measure of 5.4 GHZ CMOS Low Noise Amplifier Using Current Reuse Technique in 0.18μm Technology

Shankar¹,

dhas²

2015

Procedia Computer Science

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“…A large spike in the noise figure can be seen in each of the three cases. This spike is due primarily to the noise contributed by the secondary winding of the transformer, , as given in (9). The magnitude of the peak is determined by the of the secondary winding and the coupling coefficient, .…”

Section: Noise Analysismentioning

confidence: 99%

A Dual-Band 2.45/6 GHz CMOS LNA Utilizing a Dual-Resonant Transformer-Based Matching Network

Neihart

Brown

2012

IEEE Trans. Circuits Syst. I

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This paper analyzes and presents design equations for a new transformer-based matching network capable of simultaneously matching two different frequencies. This network is then used to realize a dual-band low-noise amplifier that is fabricated in a 0.13 m CMOS process and is capable of operating at 2.45 GHz and 6 GHz. The measured and noise figure for 2.45 GHz (6 GHz) is 9.4 dB (18.9 dB) and 2.8 dB (3.8 dB), respectively. The IIP3 is measured to be and at 2.45 GHz and 6 GHz, respectively. The power consumption of the system (excluding the buffer) is 2.79 mW from a 1.2 V supply and the total area is m m.Index Terms-CMOS, low-noise amplifier (LNA), multistandard, reconfigurable.

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“…This improves the input match, reduces NF and increases the gain [6]. The often severe trade-off between the impedance match and NF is now relaxed.…”

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confidence: 99%

“…|S 21 | at 2.4 GHz), indicating an average NF from about 3.6 to 7.7 dB with better than +0.85 dB flatness. Table 1 summarises the proposed VGA's performance compared with other gigahertz-range VGAs that have been reported recently [1,2,6,7]. It achieves a lower NF of 3.2 dB (minimum) and has comparative or better input match and IIP3.…”

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confidence: 99%

“…The VGA's chip area is also significantly smaller than most, and the design in [7] is developed in a more expensive technology (90nm CMOS) with a smaller feature size. Note that in [1,2,6] the NF is reported only at maximum gain, while in [7] the NF deteriorates further to 30 dB. Conclusion: A 1 -5 GHz general purpose VGA has been developed in 0.18 mm CMOS with a NF as low as 3.2 dB for the gain range of 5.5 to 11 dB.…”

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Wideband variable gain amplifier with noise cancellation

El-Gabaly

Saavedra

2011

Electron. Lett.

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A 1 -5 GHz noise-cancelling variable gain amplifier is presented in 0.18 mm CMOS technology that achieves a low noise figure (NF) below 4.8 dB over an 11 dB gain range. Its NF is as low as 3.2 dB for the gain range of 5.5 to 11 dB, while its input return loss is better than 13 dB over the entire gain range of 25 to 11 dB. The measured input-referred two-tone third-order intercept point (IIP3) at 2.4 GHz is better than 0 and 24.5 dBm at minimum and maximum gain, respectively. The circuit occupies an area of only 0.067 mm 2 and consumes less than 19 mW of power from a 1.8 V supply.Introduction: Variable gain amplifiers (VGAs) are very useful components in RF frontends because they serve as general-purpose gain blocks that can be used to precisely adjust the overall gain of a transceiver which may result from manufacturing tolerances in the other components in the system. A significant number of VGAs function on the principle of using a fixed gain amplifier followed by a variable attenuator to control the gain. That approach causes the VGA to have a high noise figure (NF) even in the high gain states, which makes them unattractive for use in receiver frontends. In this Letter, we demonstrate a new wideband VGA that addresses the NF problem over a wide gain range.Conventional wideband amplifiers such as the common-gate (CG) amplifier or the common-source (CS) shunt-feedback amplifier often have difficulties in achieving a low NF ( 3 dB) while maintaining a good impedance match, or suffer from limited gain and stability. Distributed and travelling wave amplifiers [1, 2] can provide a low NF, good impedance match, and flat gain over a wide range of frequencies, but typically consume a large chip area and power.More recently, inductive degeneration and multi-section inductorcapacitor (LC) networks have been reported [3] for wideband impedance matching and low NF. However, the use of several inductors on-chip consumes a large area and increases cost. Noise cancelling [4, 5] on the other hand is an effective approach for achieving a low NF and an impedance match simultaneously without the need for large inductors or feedback. Nevertheless, limited gain control has been reported if at all, and common variable gain techniques such as current steering, variable feedback and variable bias often suffer from deteriorated NF and input matching.In this Letter, a 1 -5 GHz noise-cancelling, gm-boosted amplifier is presented using 0.18 mm CMOS, with variable gain control introduced in its signal combination and noise cancellation circuit. Such an approach can provide a low NF (,4.8 dB) over an 11 dB gain range, and with a very good input match (,213 dB). The VGA is suitable for low-cost, low-power wireless communications, including 3 -5 GHz (low-band) ultra-wideband (UWB) digital radios, and 20-60 GHz millimetre-wave radios operating with an intermediate frequency (IF) in the 1 -5 GHz range.

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Design Techniques of CMOS Ultra-Wide-Band Amplifiers for Multistandard Communications

Cited by 27 publications

References 11 publications

Design and Performance Measure of 5.4 GHZ CMOS Low Noise Amplifier Using Current Reuse Technique in 0.18μm Technology

Design and Performance Measure of 5.4 GHZ CMOS Low Noise Amplifier Using Current Reuse Technique in 0.18μm Technology

A Dual-Band 2.45/6 GHz CMOS LNA Utilizing a Dual-Resonant Transformer-Based Matching Network

Wideband variable gain amplifier with noise cancellation

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