An improved frequency compensation for three‐stage CMOS amplifier

2021 ◽  
Author(s):  
Ghavam Bahadoran ◽  
Hamidreza Reza‐Alikhani
Keyword(s):  
Frequency Compensation ◽  
Cmos Amplifier

scholarly journals A High Gain, High BW OP AMP with Frequency Compensation Techniques at 65 nm Technology

2021 ◽  
Vol 12 ◽  
pp. 89-92
Author(s):  
Nihar Jouti Sama ◽  
Manash Pratim Sarma
Keyword(s):  
High Gain ◽  
Total Power ◽  
Phase Margin ◽  
Frequency Compensation ◽  
High Data ◽  
Op Amp ◽  
Step Procedure ◽  
Evolution Of Communication ◽  
Amplifier Design ◽  
Cmos Amplifier

OP-AMPs finds applications in different domains of electronics engineering including communications. There has been several OP-AMP configurations realized in the last decades for different target applications. But with the evolution of communication standards, to meet the demand for high data rate over the years, requirement for a high frequency and high BW OP-AMP is gaining attention. This makes the design challenge much higher. This paper presents a two-stage CMOS amplifier which uses frequency compensation method to facilitate higher BW. Different parameters like Gain, Gain band width product (GBWP), Phase Margin and Total Power dissipation are considered in this design. A step-by-step procedure for an efficient amplifier design is followed using frequency compensation. We have achieved a gain-bandwidth product (GBWP) of 110 MHz that is capable of driving large capacitive loads. It also achieves 77.7 dB gain with a phase margin of 60o.

Multi-stage CMOS amplifier frequency compensation using a single MOSCAP

2020 ◽  
Vol 103 (2) ◽  
pp. 237-246 ◽  
Author(s):  
Behnam Babazadeh Daryan ◽  
Hassan Khalesi ◽  
Vahid Ghods ◽  
Alireza Izadbakhsh
Keyword(s):  
Frequency Compensation ◽  
Multi Stage ◽  
Cmos Amplifier

Correction of the contrast transfer function to determine the radial density distribution of frozen-hydrated tobacco mosaic virus

1992 ◽  
Vol 50 (1) ◽  
pp. 536-537
Author(s):  
Michael F. Smith ◽  
John P. Langmore
Keyword(s):  
Transfer Function ◽  
Phase Contrast ◽  
Heavy Atom ◽  
Biological Molecules ◽  
Frequency Compensation ◽  
Contrast Transfer Function ◽  
High Background ◽  
Low Contrast ◽  
Radial Density Distribution ◽  
Excellent Preservation

The purpose of image reconstruction is to determine the mass densities within molecules by analysis of the intensities within images. Cryo-EM offers this possibility by virtue of the excellent preservation of internal structure without heavy atom staining. Cryo-EM images, however, have low contrast because of the similarity between the density of biological material and the density of vitreous ice. The images also contain a high background of inelastic scattering. To overcome the low signal and high background, cryo-images are typically recorded 1-3 μm underfocus to maximize phase contrast. Under those conditions the image intensities bear little resemblance to the object, due to the dependence of the contrast transfer function (CTF) upon spatial frequency. Compensation (i.e., correction) for the CTF is theoretically possible, but implementation has been rare. Despite numerous studies of molecules in ice, there has never been a quantitative evaluation of compensated images of biological molecules of known structure.

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