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In this paper a novel wideband transformer-based CMOS VCO with simplified topology and digital amplitude calibration is proposed. Owing to the digital amplitude calibration, the immunity to process, temperature and voltage supply variations is improved and a considerable reduction of power consumption is observed (i.e. over 25% in normal process corner, supply voltage and temperature). Besides, the...
In image-guided therapy (IGT), the coordinates of the surgical needle's tip can be calculated according to the geometric relationship between the needle's tip and the spherical markers, which are attached on the surgical needle and tracked directly by the optical trackers. Therefore, the step to determine such geometric relationship, also called calibration, is an essential component for IGT system...
In the kinematic calibration of robots, an essential step is to develop an error model. Recently, the product of exponentials (POE) due to its singularity-free property has been widely used in the calibration. However, the previous error models based on POE are of linear kind. In this paper, to investigate the applicability of the liner model, a second order error model is established. Based on the...
In this paper, a digital calibration scheme is proposed to correct phase mismatch among the multi-phase inputs of the pulse combiner to suppress the spurs at the output of the multi-modulus fractional frequency local oscillator divider. Compared with the conventional design, the proposed calibration scheme utilizes most correlated comparison algorithm to reduce convergence time significantly. The...
A time domain behavior modeling for fast-settling all digital phase-locked-loop (ADPLL) is proposed. By using the frequency presetting and adaptive bandwidth algorithm, this ADPLL can lock within 2 ??s according to the Simulink behavior simulation results. A digital frequency presetting module with self-calibration is presented for the frequency presetting method. An improved digital phase/frequency...
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