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.
An asynchronous projection and summation circuit is proposed for single photon avalanche diode (SPAD) sensors. Thanks to the efficient interconnection by the asynchronous technique, the circuit can be easily implemented inside 2D SPAD arrays. As a result, the precise summation of the 1b data in one row can be parallel processed for all rows within the same cycle. A test-of-concept chip was fabricated...
Chopping technique is an efficient approach to decrease the 1/f noise and low-frequency offset of CMOS amplifiers, but conventional chopper amplifier consumes large power because it required a wide-band amplifier exceed a chopping frequency and a post low pass filter (LPF) for eliminating modulation noise. In this paper, an improved chopper amplifier for reducing power consumption is presented which...
In this paper, a novel multiscale speckle suppression method is proposed for ultrasonic images. An original image is transformed into a multiscale curvelet domain and the thresholding estimators are derived for processing the curvelet coefficients of detail subbands by successively combining the SURE-LET approach with the neighboring windows. In order to reduce the curvelet-like artifacts, the shrinkage...
Chopping technique is an efficient approach to decrease the low-frequency offset and 1/f noise of amplifiers. In this paper, a low-power low-noise CMOS chopper amplifier is designed. This chopper amplifier is composed of a two-stage amplifier. The high output impedance of the first stage and the equivalent Miller capacitance of the second stage amplifier constitute together a low pass filter to filter...
Time-interleaved (TI) sigma-delta modulators are sensitive to channel-mismatches. In this paper, a new type of noise transfer function (NTF) which is a band-pass filter is adopted for the two-channel TI modulators to reduce the folded noise. Employing the concept of block digital filtering and theory of multirate operations, a novel two-channel TI high-order modulator is derived from the prototype...
The TBD algorithm based on dynamic programming is an effective method for detecting dim target. But the DP process during the multi-frame integration causes the expansion of targets and strong noise which may produce a large amount of false targets. To reduce them, a new discrimination method which takes advantage of the feature of trajectory is proposed in this paper. The false alarm caused by noise...
In this paper, we proposed a new speckle suppression method for medical ultrasound images based on contourlet transform. Modeling the speckle with Rayleigh distribution in logarithmically transformed ultrasound images, a maximum a posterior (MAP) estimator is applied for speckle reduction via manipulating the coefficients in contourlet domain. Experimental results show that while effectively suppress...
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.