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In this letter, we propose design techniques to suppress high-speed signal reflections observed in direct-modulated laser drivers. The first technique utilizes active back-termination (ABT) to absorb the reflected energy from the laser impedance mismatch. In the second design, capacitively coupled pre-emphasis (CCPE) is proposed to cancel the transient over-shooting observed from the bond-wire reflections...
This paper presents an energy-efficient reconfigurable 3rd-order continuous-time ΣΔ modulator, which can satisfy multi-band modes for 4G-LTE application. To expand the reconfigurable bandwidth range and optimize the energy efficiency, this work employs a flexible architecture, which can switch between feed-forward and feed-back topologies. At the circuit level, in order to reduce power consumption,...
This paper presents a ΣΔ DAC with channel filtering for multi-standard wireless transmitters. It can be digitally programmed to satisfy specifications of WCDMA, TD-SCDMA and GSM standards. The measured SFDR are 62.8/60.1/75.5 dB for WCDMA/ TD-SCDMA/ GSM mode, respectively. The ΣΔ DAC manufactured in SMIC 0.13-μm CMOS process occupies a 0.72 mm2 die area, while drawing 5.52/4.82/3.04 mW in WCDMA/TD-SCDMA/GSM...
A 434/868 MHz FSK/OOK transmitter with integrated PLL is reported. Direct digital modulation of a fully integrated Sigma-Delta fractional-N PLL frequency synthesizer is used to ensure fine frequency resolution and low phase noise. A wide-band VCO together with an Adaptive Frequency Calibration (AFC) is used to cover the desired bands. A differential-to-single output programmable power amplifier is...
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