Highly linear wide-band differential LNA using active feedback as post distortion

Amirabadi, Amir; Zokaei, Abolfazl; Bagheri, Morteza; Alirezazadeh, Fatemeh

doi:10.1109/iscas.2015.7168718

Cited by 9 publications

(6 citation statements)

References 8 publications

(9 reference statements)

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“…It could be argued that the most recent researches in LC oscillators are derived from an innovative change in differential Colpitts and cross-coupled oscillators. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] A precise study of PN in these oscillators was conducted in Andreani et al 29 and according to Hajimiri's method. The results show that the cross-coupled oscillator has better PN than the other one.…”

Section: Standardmentioning

confidence: 99%

Phase noise suppression in LC oscillators: Tutorial

Bagheri

2021

Circuit Theory & Apps

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This paper presents a comprehensive study of phase noise (PN) suppression in LC-tank oscillators. The goal of this study is to provide designers with the latest techniques for reducing PN in cross-coupled oscillators. To this end, we begin with a discussion of two prevalent PN models in oscillators: Hajimiri and Demir. We prefer the Hajimiri model because it does not involve very complicated math, and it offers engineers better insight into designing low-PN oscillators in the two-PN close-in regions in an oscillator spectrum (1/f 2 and 1/f 3 ). In 1/f 2 region, we show that a need for a large output-voltage swing leads to Class D and B oscillators, and a large output-current swing results in Class C oscillators. Also, reduction of the impulse sensitivity functions (ISFs) of an oscillator core can happen in Class F oscillators. A few solutions are presented for mitigating flicker noise up-conversion, such as adding resistances, controlling the oscillation amplitude, decreasing the conduction angle, guiding the high-frequency harmonics of current, and shifting the phase of V GS against V DS . We also provide a comparison of recent state-of-the-art literature to show what constitutes a good PN in both 1/f 2 and 1/f 3 regions in cross-coupled oscillators. We conclude that a cross-coupled oscillator can reach the best performances in 1/f 3 and 1/f 2 PN regions if the oscillator is designed in Class C with the K block and uses the techniques of narrowing the conduction angle, the tail inductor, and the modified tank simultaneously.

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Section: Standardmentioning

confidence: 99%

Phase noise suppression in LC oscillators: Tutorial

Bagheri

2021

Circuit Theory & Apps

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“…Bear in mind that M 5 and M 6 are in the active region at the beginning of each period. However, they will enter the triode region for the rest of a period, which can help to suppress the flicker noise even more 35–47 …”

Section: Design and Simulation Of Vcomentioning

confidence: 99%

An ultra‐low power and low jitter frequency synthesizer for 5G wireless communication and IoE applications

Bagheri

2021

Circuit Theory & Apps

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This paper presents a fully integrated analog phase‐locked loop (PLL) fractional‐N frequency synthesizer for 5G wireless communication and Internet‐of‐Everything (IoE) applications. To demonstrate the effectiveness of this frequency synthesizer, we apply it to three wireless communication standards. Contrary to using Verilog or VHDL to implement the programmable frequency divider, we propose a new approach in the transistor level with a new divide‐by‐2/3 circuit, dynamic asynchronous resettable D and JK flip‐flops, and the OR & AND gates to customize the divider for low‐power, low‐jitter, and fast‐lock time applications. In addition, we have designed a new frequency phase detector (PFD) to overcome the dead region issue. An ultra‐low phase noise and low‐power voltage control oscillator (VCO) is exploited from our previous work with the flicker noise corner frequency around 10 kHz to achieve the lowest possible phase noise. The implementation is done in 180‐nm standard CMOS technology. It covers two frequency ranges including 2.4 to 2.48 GHz and 5 to 5.825 GHz for these wireless communication standards. According to simulations in the worst case, the lock time, rms‐jitter, in‐band fractional spur, power consumption, and jitter‐power figure‐of‐merit of the frequency synthesizer is 18 μs, 56 fs, −63 dBc, 4 mW, and −259, respectively.

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“…The linearization of receiver front-ends, particularly LNAs, has been the focus of several papers, from calculative approaches to minimize distortion [9] to newer distortion analysis methodologies [10][11][12][13] and circuit-based techniques [14][15][16][17][18]. Chen et al [9] utilizes the calculation of Volterra kernels to achieve the criteria for IM2 cancellation and prevent it from mixing into IM3 in a broadband inductorless LNA.…”

Section: Introductionmentioning

confidence: 99%

“…There are also many papers that have come up with circuit innovations to cancel distortion with less emphasis on the analytical part. The most widespread of these include optimizing the overdrive voltage [14], using pre-distortion [15] or postdistortion networks [16,17], and derivative superposition methods [18]. As for the mixer part, since passive mixers are more linear, fewer studies have been devoted to linearizing them.…”

Section: Introductionmentioning

confidence: 99%

Origins and minimization of intermodulation distortion in a pseudo-differential CMOS beamforming receiver

Shabanzadeh

Akbar

Pärssinen

et al. 2021

Analog Integr Circ Sig Process

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This paper studies how nonlinear distortion is generated in the combination of an inverter-based low-noise amplifier and a passive mixer. The dominant nonlinearity appears to be the quadratic $$V_{gs}V_{ds}$$ V gs V ds mixing term in the passive mixer that first causes low-frequency IM2 and then upconverts it to IM3. Adding a common-mode feedback (CMFB) cancels the IM2 in a pseudo-differential structure, and hence also reduces the IM3 caused by the cascaded second order nonlinearities significantly. The effect of CMFB gain, bandwidth and linearity were analyzed, and it is concluded that from the linearity point of view, the feedback circuit does not have to be very wideband since the dominant distortion products originate from baseband. Finally, the paper takes a look at the spurious tones rising in the mixing, and how to extend the analysis to include the actual frequency translation effect.

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Highly linear wide-band differential LNA using active feedback as post distortion

Cited by 9 publications

References 8 publications

Phase noise suppression in LC oscillators: Tutorial

Phase noise suppression in LC oscillators: Tutorial

An ultra‐low power and low jitter frequency synthesizer for 5G wireless communication and IoE applications

Origins and minimization of intermodulation distortion in a pseudo-differential CMOS beamforming receiver

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