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In this work, a four-band (Band 34 and Band 38–40) TD-LTE (Time Division-Long Term Evolution) transmitter (TX) is presented and fabricated in a 0.13µm CMOS technology. The TX adopted a direct up-conversion structure and integrated a fine digital variable gain amplifier (VGA), segmented R-2R ladder DACs, high linearity up-conversion mixers and wide dynamic range programmable gain amplifies (PGA). An...
A low complexity digital IQ (in-phase and quadrature) imbalance self-calibration technique in Frequency Division Duplexing (FDD) transceiver is proposed in this paper. The RX (receiver) and TX (transmitter) IQ imbalance are compensated by a digital post-correction and pre-distortion, respectively, and the correction and distortion parameters can be accurately acquired in calibration mode while the...
In this work, an all-factor modulation bandwidth extension technique for one-point delta-sigma (ΔΣ) phase locked loop (PLL) transmitter is presented. The factors that need to be calibrated have been discussed. Firstly, RC variation of the loop filter is compensated by using an RC tracking circuit. Secondly, variation of the loop gain of the modulator is calibrated by sensing the magnitude differences...
A delta-sigma phase locked loop (PLL) transmitter with an efficient modulation bandwidth calibration technique is proposed in this paper. With the proposed technique, the digital-analog mismatch between digital pre-emphasis filter and PLL is calibrated. The loop filter variation is tracked in the first place, and then the variation of the loop gain is calibrated by sensing the magnitude...
Building simulation models play a vital role in optimal building climate control, energy audit, fault detection and diagnosis, continuous commissioning, and planning. Real system parameters are often unknown or partially unknown and need to be identified through historical data, which are currently acquired by heuristically designed experiments. Without quality sensor data, model calibration is prone...
Camera calibration is a preliminary and key work for building up a multi-camera visual tracking system. The purpose of calibration is to obtain transformations between several camera frames, so that each camera knows "where" the other cameras are with respect to itself. In this paper, we describe and implement a technique to determine the transformation of a two-camera tracking system by...
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