Successive approximation adc, Electrical Engineering

Assignment Help:

Successive approximation ADC

One method of addressing digital ramp ADC's shortcomings is so-called successive approximation ADC. Only change in this design is a very special counter circuit called a successive-approximation register. Rather than counting up in binary sequence, this register counts by trying all values of bits starting with most significant bit and finishing at least-significant bit. During the count process, register monitors the comparator's output to see if binary count is greater than or less than analog signal input, adjusting bit values accordingly. The way the register counts is identical to 'trial-and-fit' method of decimal-to-binary conversion whereby different values of bits are tried from Most Significant Bit to Least Significant Bit to get a binary number which equals original decimal number. The benefit to this counting strategy is much faster results: DAC output converges on analog signal input in much larger steps than with 0-to-full count sequence of a regular counter. 

Without demonstrating inner workings of successive-approximation register (SAR), circuit looks like this: 

83_Successive approximation ADC.png

Fig: Successive Approximation ADC Circuit

 It must be noted that SAR is normally capable of outputting the binary number in serial (one bit at a time) format hence eliminating the need for a shift register. Plotted over time, operation of a successive-approximation ADC looks like this:

1906_Successive approximation ADC1.png

1583_Successive approximation ADC2.png

Fig: Successive Approximation ADC Circuit Input and output Waveforms


Related Discussions:- Successive approximation adc

Show advantage of digital control system over analog system, Q. Show Advant...

Q. Show Advantage of digital control system over analog system? Sampled data and digital control offer several advantages over analog systems: • More compact and lightweight

Power, why do we use commutator?

why do we use commutator?

Excitation, excitation in an ac generator

excitation in an ac generator

Ampere''s law, This is at the heart of the analysis of electromagnetics. It...

This is at the heart of the analysis of electromagnetics. It is based on a series of experiments conducted by the French scientist Ampere (1775 - 1836), in which the force between

Alternater, if the prime mover input of an alternater connected directly t...

if the prime mover input of an alternater connected directly to an infinite bus in increased,then its?

Determine the mmf of the exciting coil, Q. For themagnetic circuit shown in...

Q. For themagnetic circuit shown in Figure, neglecting leakage and fringing, determine the mmf of the exciting coil required to produce a flux density of 1.6 T in the air gap. Them

Working of closed cycle and open cycle brayton cycle, Give the layout of a ...

Give the layout of a modern steam power plant and illustrate it briefly. With the help of schematic diagrams illustrate the construction and basic working of closed cycle and op

Battery service provider system specification, The vehicle batteries shall ...

The vehicle batteries shall be owned by the battery service provider. The automobile battery shall be recyclable, environmentally friendly, and safe. The battery service pr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd