scholarly journals Variable-Gain Control for Respiratory Systems

2020 ◽  
Vol 28 (1) ◽  
pp. 163-171 ◽  
Author(s):  
Bram Hunnekens ◽  
Sjors Kamps ◽  
Nathan Van De Wouw
Keyword(s):  
Gain Control ◽  
Variable Gain ◽  
Respiratory Systems

Video-Enhanced Microscopy--Better Visibility of Plant Cell Structures

1982 ◽  
Vol 40 ◽  
pp. 182-185
Author(s):  
N.S. Allen ◽  
R.D. Allen
Keyword(s):  
Diffraction Pattern ◽  
Theoretical Basis ◽  
Numerical Aperture ◽  
Gain Control ◽  
Control Unit ◽  
Camera Control ◽  
Variable Gain ◽  
Contrast Method ◽  
Fine Detail ◽  
Cell Structures

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.

A CMOS Wideband Variable Gain LNA with Novel Gain Control Method

2010 ◽  
Vol 32 (11) ◽  
pp. 2772-2775
Author(s):  
Fei-hua Chen ◽  
Xin-zhong Duo ◽  
Xiao-wei Sun
Keyword(s):  
Control Method ◽  
Gain Control ◽  
Variable Gain

10 Gb/s Burst-Mode Transimpedance Preamplifier in 0.13µm CMOS Technology

2012 ◽  
Vol 241-244 ◽  
pp. 2215-2220
Author(s):  
Gao Wei Gu ◽  
En Zhu
Keyword(s):  
Gain Control ◽  
Cmos Technology ◽  
Fast Response ◽  
High Gain ◽  
Settling Time ◽  
Output Buffer ◽  
Peak Detector ◽  
Burst Mode ◽  
Variable Gain ◽  
Response Peak

A 10Gbit/s burst-mode transimpedance preamplifier is described. Regulated cascade (RGC) TIA core with variable gain, fast response peak detector, single-to-differential and output buffer are included, providing auto-gain-control and threshold extraction functions. The burst-mode preamplifier is implemented by 0.13µm CMOS technology, presents a high gain of 67.9dB with a 3-dB bandwidth of 6.92GHz and a low gain of 57.4dB with a 3-dB bandwidth of 8.60GHz with a settling time less than 20ns.

Design and Evaluation of Flight Control Systems

1974 ◽  
Vol 188 (1) ◽  
pp. 89-96
Author(s):  
F. R. Gill
Keyword(s):  
Control Systems ◽  
Flight Control ◽  
Optimization Technique ◽  
Gain Control ◽  
Linear Control ◽  
Control Policies ◽  
Transport Aircraft ◽  
Variable Gain ◽  
Performance Requirements ◽  
Glide Path

Studies at the Royal Aircraft Establishment are aimed at the in-flight demonstration of improved control systems and policies in a fighter-attack and/or a transport aircraft. The systems being flight evaluated at the present time employ conventional linear-control policies, the design being based on a parameter-optimization technique. Two important modes are discussed briefly in the paper: a pitch-rate manoeuvre-demand system for the fighter-attack aircraft and an ILS glide path and flare system for the transport aircraft. The design studies of these and other modes have yielded quantitative data on conflicts between different performance requirements which cannot be avoided when linear-control policies are used. Studies are being made therefore to replace linear control by variable-gain policies in selected parts of the control system in order to reduce the extent of these conflicts. The reasons for and principles of the variable-gain control policies are outlined in the paper; in addition certain system improvements are discussed (e.g. trim problems) which result from the application of these non-linear control policies.

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