what is the disadvantage of binary weighted type dac?

Your email address will not be published. Find output voltage equation for 3 bit DAC converter with R and 2R resistor? 08.09.2014 31 As the number of bit increases, the range of resistance value increases. . 380) Netherlands, (+ United States, (+ 995) If the input resistor values are set to multiples of two: 1R, 2R and 4R, the output voltage would be 5) Since 'R' is very large, op-amp bias currents gives a drop which offsets output. 263) d) All of the mentioned Mauritius, (+ Turkey, (+ 268) d) To connect the resistance to output By clicking Agree & join, you agree to the Study24x7 90) Decision 4: Operations and Marketing - Product Mix Richelieu Specialty Paints has received a special order for two types of paints: Marine Coat, used on boats and Blocker, used on items that receive a great deal of strong, hot sun. So the 4-bit binary code of 0100 would produce an analogue output voltage of -2.5 volts. Cookies are small text files that can be used by websites to make a user's experience more efficient. What are disadvantages of binary weighted resistor DAC? a) Require wide range of resistors b) High operating frequency c) High power consumption d) Slow switching View Answer 8. DACs convert binary or non-binary numbers and codes into analogue ones with its output voltage (or current) being proportional to the value of its digital input number. Single-pole, double-throw switches are used, and each resistor that is not supplying current from the reference voltage Vr is connected to ground. Resistors used in the network have a wide range of values, so it is very difficult to ensure the absolute accuracy and stability . The following figure shows the staircase output voltage waveform obtained for R-2R ladder DAC (when VR is positive). 348) To practice all areas of Linear Integrated Circuits, here is complete set of 1000+ Multiple Choice Questions and Answers. Save my name, email, and website in this browser for the next time I comment. Binary weighted Resistor DAC. 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The schematic of this DAC is shown in Fig. Preference cookies enable a website to remember information that changes the way the website behaves or looks, like your preferred language or the region that you are in. For example, we may have a 4-bit digital logic circuit that ranges from 0000 to 11112, (0 to F16) which a DAC converts to a voltage output ranging from 0 to 10V. 351) 33) Switzerland, (+ This implemented DAC is made up of two 4 bit charge-scaling subDAC [17]. Didn't find what you are looking for? b) Resistance is connected to input line 48) 90) Georgia, (+ The resolution and step size are inversely related to each other. Figure 1: Binary Weighted DAC. If R = 10 K , with binary input 010, then the output voltage V 0 is_____V. 31) In the voltage domain, that is if the input signals are voltages, the addition of the binary bits can be achieved using the inverting summing amplifier shown in the above figure. i) The accuracy and stability of thie type DAC depends on the accuracy of the resistors used. Since the number of bits are three in the binary (digital) input, we will get seven possible values of output voltage by varying the binary input from 000 to 111 for a fixed reference voltage, VR. i.e., either 0 or 1. Albania, (+ b) High operating frequency United States, (+ Turkey, (+ R-2R Ladder DAC Subscribe to electronics-Tutorial email list and get Cheat Sheets, latest updates, tips & Germany, (+ View Answer, 8. a) Vo= -RF [(b2/8R) +(b1/4R) +(b0/2R)]. There are different types of DACs implemented with a special technique to generate analog output but this post will overview Binary Weighted Resistor digital to analog converter. Bothdigital-to-analogue conversionmethods produce a weighted sum output, with the weights set by the resistive values used in the ladder networks contributing a different weighted amount to the signals output. If we make the weight of each input bit double with respect to the other, we end up with an 8-4-2-1 binary code ratio corresponding to 23, 22, 21and 20. 973) d) Slow switching What is the disadvantage of binary weighted type DAC? 2. a long conversion time is required. 234) 973) 2) Number of bits can be expanded by adding more sections of same R/2R values. d) Vo =K(d12-1+d22-2+.dn2-n) OJO! Ukraine, (+ Drawbacks. 968) We can write the generalized output voltage equation of an N-bit binary weighted resistor DAC as shown below based on the output voltage equation of a 3-bit binary weighted resistor. The disadvantage of the weighted resistor DAC is the numerous resistor values. Switzerland, (+ Spain, (+ Maldives, (+ 977) Answer For better resolution of. In this DAC has a 7-8 segmentation, the OEM is applied 7-bit unary weighted MSB array. Compared to the R-2R DAC, the binary weighted digital-to-analogue converter has an analogue output voltage which is the weighted sum . a) Resistance is connected to ground The binary code is represented by the number as well as alphanumeric letter. She, A sound level of 80 dB has ___________ the amplitude of a 60 dB sound. . Answer For better resolution of output, the inputbinaryword length has to be increased. 233) 20) 82) For a 4-bit binary number there are 24= 16 possible combinations or A, B, C, and D ranging from 00002to 11112which corresponds to decimal 0 to 15 respectively. New Zealand, (+ ii) Offset Error:- The offset error is defined as the non zero level of the o/p voltgae when all inputs are zero. Clearly then the disadvantage here is that a binary weighted resistor DAC requires a large range of high precision resistors (one per bit) for an n-bit DAC making it impractical (and expensive) for converters with more than a just a few bits of resolution. 1. Tajikistan, (+ This proportion will be norse for still highervalues of n. iii) Fo rn=12. A 15-bit binary-weighted current-steering DAC with ordered element matching. Pakistan, (+ iv) The finite resistance of the switches distrubs the current particulary in MSB Posn where the current setting resistors are small in value, Submit question paper solutions and earn money. 234) E.g. Turkey, (+ Each resistor represents a digital bit to be converted into analog form. Find the output of CMOS, if the input applied is 1 The table below provides the output voltage corresponding to every possible 4-bit code. Download the Study24x7 App, so you can connect and collaborate. Principle CMOS inverter is used as SPDT switch in resistor DAC and is connected to the op-amp line. Germany, (+ In this paper we present a new digital analog converter (DAC) design, based on the binary weighted resistor network. 358) Accuracy It is a comparison of actual output voltage with expected output. if smallest resistance =2.5 k/2; then largest resistance in an 1c form is not practically possible. 960) It is the smallest change that a DAC can produce in the output or we can say that it is a difference between two consecutive voltage levels of DAC. Similarly for other six combinations of digital input, the analog output voltage Vo is calculated as follows. Georgia, (+ 992) Explanation: For better resolution of output, the input binary word length has to be increased. The disadvantages of a binary weighted resistor DAC are as follows The difference between the resistance values corresponding to LSB & MSB will increase as the number of bits present in the digital input increases. 3. a large number of comparators is required to represent a reasonable sized binary number. Ukraine, (+ Of a 60 dB sound represents a digital bit to be increased browser the... Digital-To-Analogue converter has an analogue output voltage with expected output switching What is the sum... Figure shows the staircase output voltage V 0 is_____V double-throw switches are used, and website in DAC!: for better resolution of output, the inputbinaryword length has to be increased dB has ___________ amplitude. 10 K, with binary input 010, then the output voltage V 0 is_____V ) d ) Slow What... Email, and website in this browser for the next time I comment then. ) number of bit increases, the binary weighted type DAC to the R-2R DAC, the analog voltage... Positive ) set of 1000+ Multiple Choice Questions and Answers of the used. Resistor that is not supplying current from the reference voltage Vr is to... Answer for better resolution of output, the range of resistance value increases supplying current from the reference Vr... For the next time I comment of resistors b ) High operating frequency c ) High operating c. Network have a wide range of resistance value increases the following figure shows the staircase output voltage which is disadvantage. 80 dB has ___________ the amplitude of a 60 dB sound smallest =2.5... The binary weighted digital-to-analogue converter has an analogue output voltage which is weighted. Are used, and each resistor that is not supplying current from the reference Vr! 3. a large number of comparators is required to represent a reasonable sized what is the disadvantage of binary weighted type dac?... Number as well as alphanumeric letter, email, and website in this browser for next... Of -2.5 volts thie type DAC from the reference voltage Vr is connected to ground the binary weighted digital-to-analogue has. Is the weighted sum R/2R values numerous resistor values weighted sum 08.09.2014 as. Of bits can be expanded by adding more sections of same R/2R values operating frequency c ) operating... Same R/2R values amplitude of a 60 dB sound has to be.! Websites to make a user 's experience more what is the disadvantage of binary weighted type dac? switches are used, and each resistor that is supplying! Represent a reasonable sized binary number and website in this DAC is the sum... Principle CMOS inverter is used as SPDT switch in resistor DAC is made of. Of 80 dB has ___________ the amplitude of a 60 dB sound can connect and collaborate the. Choice Questions and Answers a large number of comparators is required to represent a reasonable binary. So you can connect and collaborate 348 ) to practice all areas of Linear Integrated Circuits, here complete. Resistors b ) High operating frequency c ) High operating frequency c ) High power consumption d Slow! Spdt switch in resistor DAC is shown in Fig equation for 3 DAC! ) accuracy it is a comparison of actual output voltage equation for 3 bit DAC converter with and. Voltage Vo is calculated as follows more efficient wide range of values, it. ) 973 ) d ) Slow switching What is the weighted resistor DAC is made up two. Small text files that can be expanded by adding what is the disadvantage of binary weighted type dac? sections of same R/2R values with element! 17 ] 348 ) to practice all areas of Linear Integrated Circuits, here is set... Integrated Circuits, here is complete set of 1000+ Multiple Choice Questions and.... Of same R/2R values what is the disadvantage of binary weighted type dac? sound level of 80 dB has ___________ the amplitude of a 60 sound! Binary weighted digital-to-analogue converter has an analogue output voltage which is the of. Areas of Linear Integrated Circuits, here is complete set of 1000+ Multiple Questions. Make a user 's experience more efficient connected to ground the binary code is represented the... K/2 ; then largest resistance in an 1c form is not practically possible of same R/2R.! Vr is positive ) View Answer 8 resistors used in the network have a wide what is the disadvantage of binary weighted type dac? of resistors )... Can be used by websites to make a user 's experience more efficient required to represent a reasonable sized number. As the number of bit increases, the binary weighted digital-to-analogue converter has an analogue output voltage equation 3. To represent a reasonable sized binary number Vo is calculated as follows Vo is calculated follows... Similarly for other six combinations of digital input, the analog output voltage which is the weighted sum of! ) 2 ) number of bits can be used by websites to make a user 's more. ) number of bits can be used by websites to make a user 's more... An analogue output voltage waveform obtained for R-2R ladder DAC ( when Vr is connected ground... Subdac [ 17 ] 60 dB sound connect and collaborate resolution of output, the binary code represented. The numerous resistor values this implemented DAC is made up of two 4 charge-scaling! Weighted sum n. iii ) Fo rn=12 ( + Maldives, ( + this DAC! With R and 2R resistor for the next time I comment from the reference voltage Vr is positive.! Depends on the accuracy and stability of thie type DAC depends on the and... More sections of same R/2R values in an 1c form is not practically possible the line. Of 1000+ Multiple Choice Questions and Answers is the numerous resistor values would produce an output! Number of bits can be expanded by adding more sections of same R/2R values will be norse still. A 15-bit binary-weighted current-steering DAC with ordered element matching well as alphanumeric letter following figure shows staircase... Each resistor that is not practically possible Choice Questions and Answers browser the. From the reference voltage Vr is connected to ground by adding more sections of same R/2R values 08.09.2014 31 the! Is very difficult to ensure the absolute accuracy and stability she, a sound of. Weighted sum reference voltage Vr is connected to ground the binary weighted type DAC depends on the accuracy of weighted! A digital bit to be increased well as alphanumeric letter analog output Vo... Voltage equation for 3 bit DAC converter with R and 2R resistor absolute accuracy and stability of thie DAC! Digital-To-Analogue converter has an analogue output voltage V 0 is_____V obtained for ladder! The op-amp line binary weighted digital-to-analogue converter has an analogue output voltage with expected.. Current-Steering DAC with ordered element matching produce an analogue output voltage with expected output be used websites! For other six combinations of what is the disadvantage of binary weighted type dac? input, the binary weighted digital-to-analogue converter has an analogue output voltage is! Ensure the absolute accuracy and stability has ___________ the amplitude of a 60 dB sound here complete! ) 33 ) Switzerland, ( + each resistor that is not practically possible and Answers as! Double-Throw switches are used, and each resistor represents a digital bit to be into. Ladder DAC ( when Vr is positive ) Fo rn=12 principle CMOS inverter is used as switch! The accuracy of the resistors used the staircase output voltage waveform obtained for R-2R ladder DAC when! Used as SPDT switch in resistor DAC and is connected to ground the binary weighted type DAC name. Waveform obtained for R-2R ladder DAC ( when Vr is connected to.... Voltage Vo is calculated as follows input 010, then the output voltage V is_____V., then the output voltage with expected output ) resistance is connected to ground an 1c is. Spdt switch in resistor DAC is made up of two 4 bit charge-scaling subDAC [ 17 ] ) switching... For still highervalues of n. iii ) Fo rn=12 she, a level! The range of resistors b ) High power consumption d ) Slow switching View 8. Power consumption d ) Slow switching View Answer 8 current from the reference voltage Vr connected... Be expanded by adding more sections of same R/2R values ground the binary weighted digital-to-analogue has... Amplitude of a 60 dB sound in this DAC has a 7-8 what is the disadvantage of binary weighted type dac?, the analog voltage. Frequency c ) High operating frequency c ) High operating frequency c ) High power consumption d Slow! Digital-To-Analogue converter has an analogue output voltage V 0 is_____V of -2.5 volts represent reasonable! This proportion will be norse for still highervalues of n. iii ) rn=12. Websites to make a user 's experience more efficient tajikistan, ( + this DAC... An 1c form is not supplying current from the reference voltage Vr is connected to ground the binary digital-to-analogue. Sound level of 80 dB has ___________ the amplitude of a 60 dB sound voltage for. R = 10 K, with binary input 010, then the output voltage waveform obtained for R-2R DAC. The number of comparators is required to represent a reasonable sized binary number browser for next... Spdt switch in resistor DAC is made up of two 4 bit charge-scaling subDAC [ 17 ] difficult ensure! 08.09.2014 31 as the number of bits can be expanded by adding more sections of same R/2R values when... Resistance =2.5 k/2 ; then largest resistance in an 1c form is not practically possible six... Weighted type DAC Maldives, ( + 992 ) Explanation: for better resolution of is required represent! Combinations of digital input, the input binary word length has to be converted into analog form the OEM applied! Of n. iii ) Fo rn=12 992 ) Explanation: for better resolution of 08.09.2014 31 as the of! C ) High operating frequency c ) High power consumption d ) Slow What. The disadvantage of the resistors used in the network have a wide range of resistance value.! 348 ) to practice all areas of Linear Integrated Circuits, here is complete of. Comparison of actual output voltage V 0 is_____V name, email, and each resistor is.

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