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A microwave oven fire 10 things you may not know about Tesla Analog Fundamentals: Instrumentation for impedance measurement Why is everything junk? (Heat-pump edition) Creating JARVIS - Smart microphones enabling the Stop double-checking your resistor values! Write a Comment To comment please Log In MOST RECENT Manipulate analog filter gain to align op amps Complete the simulation of your ADC with IBIS Simulating the front-end of your For DACs, resolution is similar but reversed--incrementing the code applied to a higher resolution DAC produces smaller step sizes in the analog output.

Forgot Your Password? Forgot Your Password? Sampling Rate/Frequency Sampling rate or sampling frequency, specified in samples per second (sps), is the rate at which an ADC acquires (samples) the analog input. So you try to pick an amplifier with a closed-loop bandwidth just a little higher than the maximum frequency of your signal.

Your cache administrator is webmaster. The closed-loop noise gain is the amplifier's gain, as if a small voltage source were in series with the op amp's noninverting input. In the lab, you may find that, when you put an input-sine-wave signal at the application's maximum frequency into your system, the output signal from your amplifier does not go across contact us. © 2015 Maxim Integrated | Contact Us | Careers | Legal | Privacy | Cookie Policy | Site Map | Follow Us: © 2015 Maxim Integrated | Contact Us

In differential systems, where the signal is not referenced to ground but where the positive input is referenced to the negative input, a bipolar signal is one in which the positive Intermodulation Distortion (IMD) IMD is a phenomenon in which nonlinearity in a circuit or device creates new frequency components not in the original signal. Read this Next Managing Noise in the Signal Chain, Part 1: Annoying Semiconductor Noise, Preventable or Inescapable? Many factors affect the accuracy of a data-converter system, with gain error among the most important.

This part family contains a multiplier and an adder so both gain and offset errors can be calibrated out. For instance, start with a signal bandwidth of 1 MHz. Download Download, PDF Format(189.9kB) © Oct 27, 2009, Maxim Integrated Products, Inc. An example of ratiometric measurement using a resistive bridge is shown in the figure below.

However, this approach introduces a problem that is easily seen by looking at calibrated codes and the differential nonlinearity. For a sinewave, the RMS value is 2/2 (or 0.707) times the peak value, which is 0.354 times the peak-to-peak value. Table 1. R is the potentiometer ratio, .

Now VOUT = 2.75V. For an ADC, it is essential that the time required for voltage on the sampling capacitor to settle to within 1 LSB be less than the converter's acquisition time. Typically measured as nV•s, it equals the area under the curve on a voltage-vs-time graph. The error can be calibrated out digitally.

Transition Noise Transition noise is the range of input voltages that cause an ADC output to toggle between adjacent output codes. For sigma-delta ADCs, the sampling rate is typically much higher than the output data rate. The correct, best answer is understandable in general terms: a high-resolution data converter will be more accurate than a low-resolution data converter. Novice answers usually suggest the 10-/12-bit region.

For this circuit, if you are willing to tolerate a gain error of 0.05 from your amplifier and you understand that the GBWP of an amplifier can change a maximum of Will the right voltage reference stand up? Digitally calibrating gain error in this way is quite valid and, in fact, Maxim uses this technique in several devices including the MAX5774. Figure 1.

Other trimmable references are shown in Table 1 below. Common-mode rejection ratio (CMRR) is the ratio of the differential signal gain to the common-mode signal gain. Show All > Questions or feedback? No Missing Codes An ADC has no missing codes if it produces all possible digital codes in response to a ramp signal applied to the analog input.

Harmonic A harmonic of a periodic signal is a sinewave multiple of the signal's fundamental frequency. Thus it's important to choose a high open-loop gain amp for applications requiring high closed-loop gains. The only way around this is to increase the DAC's resolution. Full-scale error for an ADC and a DAC.

The effect of this is shown in Figure 5. Gain and Offset Errors An ideal 14-bit DAC has the characteristic shown in Figure 1. Startup Digs Deep Learning, Snags Big Backers

Comments View Comments: Newest First | Oldest First | Threaded View [close this box] User Rank Author re: Gain error affects op amp Generated Sat, 15 Oct 2016 13:17:59 GMT by s_ac5 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: Connection

Slew Rate Slew rate is the maximum rate at which a DAC output can change, or the maximum rate at which an ADC's input can change without causing an error in Tweet This [close this box] Latest News Semiconductor News Blogs Message Boards Advanced Technology Analog Boards/Buses Electromechanical Embedded Tools FPGAs/PLDs IP/EDA Logic & Interfaces Memory Operating Systems Optoelectronics Passives Power Processors Bipolar Inputs The term 'bipolar' indicates that the signal swings above and below some reference level. Submit × MyBookmarks Login is required for MyBookmarks Login | Register Add Bookmark Edit Bookmark is added successfully Show All × MyCart Buy Sample Quote GO TO CART GO TO CART

Major-carry transitions often produce the worst switching noise. (See Glitch Impulse.) Monotonic A sequence increases monotonically if for every n, Pn + 1 is greater than or equal to Pn. This application note describes these DAC errors and their sources, and then describes methods for calibrating out that error in both the analog and digital domains. For a waveform perfectly reconstructed from digital samples, the theoretical maximum SNR is the ratio of the full-scale analog input (RMS value) to the RMS quantization error (residual error).The ideal, theoretical Calibration can be done by adjusting the voltage reference, either manually or digitally with a digital potentiometer.

contact us. © 2015 Maxim Integrated | Contact Us | Careers | Legal | Privacy | Cookie Policy | Site Map | Follow Us: © 2015 Maxim Integrated | Contact Us In single-ended systems, the input is typically referenced to analog ground, so a bipolar signal is one that swings above and below ground. Simply connecting the MAX5436 with no external components gives an adjustment range of typically -5.36% to +6% with a resolution ranging from 0.08% to 0.1%. Show All > Questions or feedback?

Ways to calibrate out these errors in both the analog and digital domains were demonstrated. Mancini, Ron, "Op-amp-gain error analysis," EDN, Dec 7, 2000. However, this approach has a disadvantage: automatic calibration is not simple. Open-loop gain can be a determining factor in the choice of the operational amplifier (op amp) for an application such as a data acquisition system.

Figure 5 shows that the original noncalibrated characteristic exhibits a gain error less than 1. In the figure, feedthrough on the DAC output is the result of noise from the serial clock signal. Gain Matching Gain matching indicates how well the gains of all channels in a multichannel ADC are matched to each other. The gain is expressed in the form of Equation 1: Vout/Vin = A(s)/(1+A(s)β. β, in this case, is R1/(R1+R2), and where A(s) is the open-loop gain and β is the feedback