Input impedance conditions for minimizing the noise figure of an analog optical link

1998 ◽  
Vol 46 (12) ◽  
pp. 2025-2031 ◽  
Author(s):  
E.I. Ackerman ◽  
C. Cox ◽  
G. Betts ◽  
H. Roussell ◽  
F. O'Donnell ◽  
...  
Keyword(s):  
Input Impedance ◽  
Noise Figure ◽  
Optical Link ◽  
Impedance Conditions

Sub-10-dB Noise Figure in a Multiple-GHz Analog Optical Link

2007 ◽  
Vol 19 (7) ◽  
pp. 465-467 ◽  
Author(s):  
Jason D. McKinney ◽  
Modesto Godinez ◽  
Vincent J. Urick ◽  
Suwat Thaniyavarn ◽  
Walter Charczenko ◽  
...  
Keyword(s):  
Noise Figure ◽  
Optical Link

Analysis and Optimization of Voltage-Driven Double-Balanced Passive Mixer for MICS Band Receiver

2019 ◽  
Vol 28 (12) ◽  
pp. 1950204
Author(s):  
Mouna Bettaieb ◽  
Ghazi Bouzid ◽  
Saif Benali ◽  
Hatem Trabelsi
Keyword(s):  
Input Impedance ◽  
Noise Figure ◽  
Impedance Matching ◽  
Time Domain Analysis ◽  
Passive Mixer ◽  
Fully Differential ◽  
Voltage Variation ◽  
Mics Band ◽  
Harmonic Components ◽  
Implant Communication

This paper presents analysis of a 25% duty-cycle fully-differential double-balanced passive mixer dedicated to medical implantable devices. The proposed passive mixer is part of a medical implant communication service (MICS) receiver front-end operating at 402–405[Formula: see text]MHz. By performing time-domain analysis, two LTI models have been developed to study the fully-differential double-balanced passive mixer: A simplified model and a complete model taking into account harmonic components. Both models account for the AC coupling capacitors at the mixer input and account for baseband voltage variation over one LO period. In this study it has been shown the ability of mixer input impedance matching by varying baseband resistor at the mixer output. The frequency of match can be controlled by varying the AC coupling capacitors and baseband capacitors. The performance of the proposed models was compared with that of the mixer and the results were very close. In particular, the results of simulations of the input impedance as a function of the baseband resistance and as a function of the IF frequency show the validity of the proposed models. The main parameters of the passive mixer such as input impedance, gain and noise figure (NF) were optimized taking into account the constraints of our application. The proposed mixer is designed to operate at LO frequency of 403.2[Formula: see text]MHz. Transistors size is optimized to meet the receiver specifications. The mixer realizes a conversion gain of 0[Formula: see text]dB and an NF of 4.8[Formula: see text]dB. Linearity simulations show 25.2[Formula: see text]dBm for IIP3 and 9.66[Formula: see text]dBm for [Formula: see text]dB. The mixer consumes 1.44[Formula: see text]pW without LO circuit.

Low Noise Figure, Wide Bandwidth Analog Optical Link

2005 ◽  
Author(s):  
E. Ackerman ◽  
G. Betts ◽  
W. Burns ◽  
J. Prince ◽  
M. Regan ◽  
...  
Keyword(s):  
Noise Figure ◽  
Low Noise ◽  
Wide Bandwidth ◽  
Optical Link

Design and Analysis of a Broadband Current-Mode CMOS Direct-Conversion Receiver Frond-End Circuit

2019 ◽  
Vol 28 (10) ◽  
pp. 1950169
Author(s):  
Xin Han Chen ◽  
Shuxiang Song ◽  
Mingcan Cen
Keyword(s):  
Duty Cycle ◽  
Input Impedance ◽  
Noise Figure ◽  
Current Mode ◽  
Direct Conversion ◽  
Low Noise ◽  
Transimpedance Amplifier ◽  
Conversion Gain ◽  
Low Input ◽  
A Current

A broadband (0.8–5[Formula: see text]GHz) CMOS current-mode direct-conversion receiver has been integrated in a 0.18-[Formula: see text]m CMOS process. The proposed receiver front-end features a broadband active-balun low-noise transconductance amplifier (LNTA) driving a current-mode passive mixer terminated by a low-input-impedance transimpedance amplifier (TIA). The receiver chain has improved robustness to out-of-band interference, conversion gain and outstanding linearity. With the technique of noise and distortion cancellation which performs a better input impedance matching, we employ a broadband common-gate–common-source (CG–CS) LNTA and a current mirror to improve both gain and noise figure (NF) performance. Compared to the 50% duty-cycle switching stage, the 25% duty-cycle I–Q switching stage is implemented by using serial switches driven by 50% quadrature local oscillator (LO) signals separately, which improves the down-conversion gain by 3[Formula: see text]dB and lowers the noise figure. The transimpedance amplifier employs the [Formula: see text]-boosting technique to realize low input impedance and high transimpedance gain. The core circuit (RF and baseband signal path) consumes 26[Formula: see text]mW, and the prototype receiver achieves approximately 33–34.5-dB conversion gain, 8.1–9.35-dB NF and 7.5–9.8-dBm IIP3 from 0.8[Formula: see text]GHz to 5[Formula: see text]GHz.

On Wafer Noise Figure De-Embedding Method for CMOS Differential LNA

2020 ◽  
Vol E103.C (7) ◽  
pp. 335-340
Author(s):  
Maizan MUHAMAD ◽  
Norhayati SOIN ◽  
Harikrishnan RAMIAH
Keyword(s):  
Noise Figure ◽  
Embedding Method
Sign in / Sign up

Export Citation Format

Share Document