This paper presents a broadband variable gain amplifier (VGA) with low phase variation in 65 nm CMOS technology. The mechanism of VGA is analyzed. According to the analysis, feedforward paths formed by parasitic capacitive and inductive couplings are one main factors that result VGA. In order achieve variation, capacitor elimination technique proposed remove path gate-drain capacitor. Besides, an isolation enhancement layout minimize coupling capacitors stage. As results, measured 0.2° ~ 2°...

This article presents a 60-GHz variable gain phase shifter (VGPS) with orthogonal and control technique linear in 65-nm CMOS. Using the technique, proposed VGPS has ability of tuning without extra block, significantly reducing size conventional phased arrays. The is to greatly improve accuracy robustness against temperature variation. As results, achieves 6-bit resolution across -25 °C 110 continuous range 14.8 dB. measured 3-dB bandwidth 52-64 GHz. -22.4 -dB, root-mean-square (rms) errors...

Lung transplantation (LTx) is the definitive treatment for end-stage pulmonary diseases, with venoarterial extracorporeal membrane oxygenation (VA-ECMO) used as a common perioperative support. However, it remains unclear if central (cVA-ECMO) or peripheral (pVA-ECMO) cannulation routes yield better outcomes in postoperative prognosis. This study compares impact of these two strategies on primary graft dysfunction (PGD) incidence LTx patients. A retrospective analysis was performed 153...

This paper presents a V-band active phase shifter using proposed linear control technique with 1.4° step in 65-nm CMOS technology. Different from conventional shifter, the achieves relationship between output and signals. It makes of more accurate greatly improves resolution. Furthermore, current-reuse is used to improve gain mm-wave frequency. The measurement results show that measured 3-dB bandwidth 51.5 ~ 64.5 GHz achieved. RMS error 8-bit resolution 0.5° 1.2° variation 0.17 0.25 dB....

In this paper, a Class-C voltage controlled oscillator (VCO) for 24 GHz FMCW radar system is presented. order to achieve good phase noise performance and get wide frequency tuning range, switched capacitor bank used coarse-tuning fine-tuning the output of VCO. The proposed VCO fabricated in 65-nm CMOS process occupies die area 0.38×0.5 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> .The range 21.95 <sub...

This paper presents a 6-bit vector-sum phase shifter with half-quadrant control technique for Ku-band phased arrays. In this paper, the gain and symmetry in each quadrant is studied. Based on shifter, proposed to simplify complexity of control, measurement calibration large-scale Besides, optimization method without extra settings achieve low error. As results, measured RMS error 1.6° ~ 2.3° across 13 17 GHz only 64 different states, demonstrating brevity accuracy simultaneously. With same...

Abstract A X‐band variable gain amplifier (VGA) with low phase variation and high control resolution is presented in 180‐nm CMOS. The linear VGA current‐type digital‐to‐analog converter (DAC) are implemented to improve the accuracy of robustness against process, supply voltage, temperature variations (PVT). measured peak 3‐dB bandwidth 8 dB 8.5 11.6 GHz, respectively. range 15 a step 1 dB. With voltage varying from 1.6 2.0 V, root‐mean‐square (RMS) errors &lt;0.62 &lt;1.5°, 1.8 across −25...

A group-delay compensation power amplifier (PA) is proposed in this paper. Equalizer based on the all-pass filter used to reduce chirp signal linearity distortion caused by nonlinear group delay of PA. The variation whole PA less than ±5ps. An auto power-level control loop adopted stabilize output against temperature and process variation. detector charge pump. different level can be set using directly satisfy needs detection distance. gain 21.5 dB maximum 14.5 dBm. 2f <sub...

A variable gain amplifier (VGA) featuring wide bandwidth and low phase variation is presented for the new generation phased arrays supporting multiple-frequency bands simultaneously. In this article, mechanism of in common-source (CS) CMOS cell investigated detail. As revealed by analysis, parasitic capacitor <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${C} _{\text {gd}}$ </tex-math></inline-formula>...

Abstract A 7‐bit passive phase shifter with low‐phase error is presented in 65 nm CMOS technology. The vector‐sum topology implemented to enable the ability of flexible calibration. Therefore, high resolution and achieved. In order achieve linearity, attenuator based on resistor scale I/Q signals, a vector synthesizer balun utilized sum quadrature vectors. Measurement results show that achieves resolution. measured root mean square (RMS) &lt;2.1°, RMS gain &lt;1.2 dB over 21.5 ~ 25 GHz....

Abstract Background: Postoperative pain management is a critical consideration in patients undergoing endoscopic submucosal dissection (ESD) for early esophageal carcinoma. Conventional transitional analgesia methods involve the administration of either oxycodone or sufentanil. However, efficacy context with carcinoma ESD under general anesthesia remains uncertain. This study aims to compare postoperative analgesic effects and sufentanil anesthesia. Methods: In this randomized double-blind...

In this paper, a passive resistive ring mixer is demonstrated in commercial 65-nm process. This achieves low conversion loss with Local Oscillator (LO) power and high isolation between LO RF ports. The gate terminals of core devices are biased at subthreshold voltage to improve the loss. offers 2.2-5.2 dB over 15-27 GHz when 2.7 dBm. Meanwhile, symmetrical layout helps achieve LO-to-RF which larger than 47 whole operating frequency range. When signal 24.01 IF 10 MHz, measured input 1dB...

Abstract A balun design algorithm based on the compensation matching capacitors and active S parameter is given in this paper. Compared with inductor network, not only compensate phase amplitude error of balun, but also occupy a compact chip area. Considering coupling between two differential terminals adopted. On basis parameter, reflection coefficients are calculated directly. algorithm, simulated less than 0.97° 0.13 dB, from 15 to 18 GHz. Moreover, 5‐bit switch‐type shifter baluns...