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The paper presents a 24 V chopper offset-stabilized operational amplifier with symmetrical RC notch filters, having a 4–24 V supply range, and being realized using a 0.25 ßm BCD process. The amplifier has a typical offset voltage of 1.2 μV, a minimum PSRR of 128 dB, a minimum CMRR of 120 dB, a minimum open-loop gain of 134dB, a noise PSD of 30 nV/√Hz, 1.8 MHz unity gain bandwidth, and THD + noise...
Feedback improves the linearity of the main path; however, this increases the linearity requirement of the feedback path in conventional transmitter Cartesian feedback architecture. To alleviate this issue, the feedback signal should be largely attenuated, which then inevitably degrades the system noise performance. To mitigate the trade-off between noise and linearity, we have invented a new architecture,...
For a minimum noise figure (NFmin) operation, this paper presents a new graphical model that characterizes the boundaries of the transducer gain (GT) for an unconditionally stable transistor. First, a full visual view of the transistor operating at minimum noise figure (NFmin) is given. Second, the transistor operating capacity is determined through monitoring both the GT and the voltage standing...
In this paper we will discuss the CMOS circuit design strategies and main results for an all-CMOS MEMS based oscillator in order to reduce the oscillator far-to-carrier noise (which is limited by the circuit noise) and the close-to-carrier noise (which is limited by both the amplifier phase noise and the MEMS quality factor). The feasibility of using the Via layer of a commercial CMOS technology to...
In this paper, a new trend in the design of a microwave amplifier is proposed. The pivot element in the design is to numerically investigate the the relation between VSWR with different frequencies, reflection coefficients, and noise figures. Multiple curves relating the VSWR with both the reflection coefficient and the transducer gain facilitates the location of a starting point for the optimization...
Noise characteristics of non-degenerate optical parametric phase sensitive amplifiers are theoretically investigated using numerical simulation. Quantum properties of noise are taken into account by adding random amplitude to signal as vacuum noise. Amplitude noise suppression owing to gain saturation and its mitigation due to distributed loss in a gain medium are shown.
Stochastic fluctuations of chemical reactions are particularly prominent in small systems such as cells. Such fluctuations of cellular signal processes have been observed directly by single-molecule imaging. Recent theoretical studies have also revealed that stochastic cellular reactions generate fluctuations in the number of a molecule, which can be related to their functioning such as amplification...
The phased arrays provide a high antenna gain and can be applied to the future indoor Terahertz (THz) communications to compensate for the high path loss, which, however, requires a precise estimate of the direction of signal arrival. This paper presents a method for the signal arrival direction estimate in cases when the user equipment is moving in the wireless network coverage area. The method uses...
In biomedical field there is a great need of VLSI in designing integrated bioamplifier circuits which performs the operation of amplifying low amplitude and low frequency signals. Due to excessive demand of implantable and wearable devices for processing biopotential signals, a low power bioamplifier is proposed in this paper and power dependency of bioamplifier on different current mirror configuration...
This paper investigates an inductorless technique for bandwidth extension which uses local positive feedback in an optical receiver front-end based on an inverter-based transimpedance amplifier and Cherry-Hooper post-amplifiers. Small feedback inverters create negative resistance that boosts the output resistance of inverter-based amplifiers. Compared to a reference design having a TIA and a three-stage...
A 100 Gb/s transimpedance amplifier (TIA) for next generation optical communication adopts a diode-connected input-resistance-reduction architecture and is designed in 32 nm CMOS SOI technology. The proposed TIA design is based on a gm-boosted common-gate amplifier with a diode-connected current source and incorporates a single-to-differential signal conversion architecture. The input resistance of...
In active noise control (ANC) system, the injection of white Gaussian noise (WGN) for online feedback path modeling and neutralization (FBPMN) degrades the noise-reduction-performance (NRP). In this paper: (1) a tuning free gain scheduling of WGN is used to improve the NRP of ANC system, and (2) a variable step-size is used to compensate for the decrease in the convergence of FBPMN filter due to gain...
We investigate the dependence of maximum system reach on symbol rate. We identify a suitable modeling framework and derive a closed-form formula for the optimum rate, typically 2-to-10 GBaud. Maximum reach gains are between 5% and 20%.
A 410-GHz imager consisting of a 4th sub-harmonic mixer formed with an anti-parallel diode-connected NMOS transistor pair, and an on-chip antenna with 4.4-dB simulated gain is demonstrated in 65-nm CMOS. At −1.6-dBm power delivered to the LO input bond pad, the imager achieves 16.8-dB voltage conversion loss and 34.1-dB DSB noise figure. When the noise bandwidth is 1 kHz, sensitivity is −110 dBm,...
G.fast is the most recent ITU-T standard for copper-based transmission, which targets at short distances and adopts a bandwidth of 106 MHz extensible to 212 MHz. In several scenarios G.fast systems will be composed by or coexist with uncoordinated lines, which are sources of strong crosstalk. This work focuses on evaluating an alien (out-of-domain) crosstalk mitigation method based on noise prediction...
In order to support a wide set of communication standards and to accommodate different applications in a single device, broadband receivers are essential and inevitably in demand. A wideband low-noise amplifier (LNA), which is a key block in the design of broadband receivers for multiband wireless communication standards, is proposed. A differential common-gate (CG) LNA utilizing multiple-feedback...
A controller design method for constant value control systems has been proposed. The method requires only one-shot experimental data which is obtained from the stabilized closed-loop system when a known zero-mean noise is applied to the output of the plant. The data is used to estimate the plant model by the least square method. The controller is tuned by specifying the stable margin in consideration...
A wideband CMOS receiver front-end for radio applications operating between 300 MHz and 900 MHz is presented. In order to obtain channel selection with image-rejection and out-of-band interferers attenuation, both low-noise amplifier (LNA) and mixer incorporate a N-Path signal processing technique. The effectiveness of this N-Path filtering is investigated by comparing distinct combinations of clock...
A fully integrated low power LNA is implemented using 65-nm RF CMOS technology for 2.14-GHz band. By taking the advantage of higher transition frequency of recent technologies, transistors are biased in the moderate inversion region and this permitted scaling down the supply voltage to 0.7 V. Further, the exploration of design spaces from strong to weak inversion led to the development of a low power...
We present a CMOS differential neural amplifier with high input impedance, which topology is inspired by the instrumentation amplifier. The miniaturization of the MEAs goes with an increase of the electrodes impedance and necessitates high input impedance neural amplifiers; otherwise it results in a significant loss of signal and low SNR. The circuit presented here is designed on a 0.35 μm CMOS technology...
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