The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Purpose As an inexpensive, noninvasive, and portable clinical imaging modality, ultrasound (US) has been widely employed in many interventional procedures for monitoring potential tissue deformation, surgical tool placement, and locating surgical targets. The application requires the spatial mapping between 2D US images and 3D coordinates of the patient. Although positions of the devices (i.e., ultrasound...
The time interleaved method is an efficient solution to breakthrough the interface speed bottlenecks in optical communication. But it's sensitive to the mismatches between the interleaved channels. We introduce a blind adaptive method to correct the timing errors in a four-channel time-interleaved analog-to-digital converter (TIADC). The proposed error estimation method is based on the correlation...
Since high-speed and high-resolution ADCs are needed in communication systems, single ADC can hardly achieve. This paper proposed a timing mismatch estimation and calibration algorithm in Time-Interleaved ADC (TIADC). A multistage differentiator-multiplier cascade (DMC) structure is disclosed for timing mismatch correction. As the present estimation and calibration method, the procedure can be performed...
We propose a blind correction approach to eliminate the distortion imported by timing skew, gain and offset mismatches in time-interleaved analog to digital converters (TIADC). The approach works in digital domain which can be used in M-channel TIADC. The correction algorithm for timing skew mismatch is based on synthesis filter banks and the estimation algorithm uses the crosscorrelation of adjacent...
In this paper, an adaptive blind calibration method for timing mismatch in time-interleaved ADCs is proposed. A modified correction structure based on Differentiator Multiplier Cascade is presented for error correction. It enables the application of adaptive blind timing estimation, while the adaptive blind estimation method requires the input signal to have a significantly rich spectrum and be slightly...
This paper describes a digital calibration method for reducing the distortion created by timing mismatch in a four-channel time-interleaved analog-to-digital converter (TIADC). It bases on a coordinate rotation digital computer (CORDIC) algorithm for estimating the timing error and a multistage differentiator-multiplier cascade structure for timing error correction. Frequency of the testing signal...
As we known, time-interleaved analog-to-digital converters (TIADC) is effective on increasing the system sampling rate. But the gain, offset and time mismatches among the sub-ADCs introduce undesirable noise into the system and degrade the overall performance seriously. This paper describes a post calibration method with digital filter banks to remove the gain and time mismatch errors. These digital...
Time-interleaved (TI) Analog-to-Digital Converters (ADC) are efficient for high-speed data acquisition. However, mismatches among different channels in a TIADC system due to manufacturing process variations cause distortion in the sampled signal and degrade the SNR and SFDR significantly. The offset and gain mismatches are the two important error sources for the TIADC system. In this paper, a methodology...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.