A High Speed CMOS Transmitter and Rail-to-Rail Receiver
ABSTRACT This paper presents a high speed low voltage differential signal (LVDS) interface circuit for CPU, LCD, FPGA and other fast links. In the proposed transmitter a stable reference and a common mode feedback circuit are applied into the LVDS drivers, which enable the transmitter to tolerate the variations of process, temperature and supply voltage. The proposed receiver implements a rail-to-rail amplifier architecture which allows a 1.6 Gb/s transmission. The transmitter and receiver are implemented in HJ TC 3.3 v, 0.18 plusmn CMOS technology. Transmission operations up to 1.6 Gb/s with random data patterns were demonstrated. The transmitter and receiver pad cells exhibit a power consumption of 35 mW and 6 mW respectively.
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ABSTRACT: A high speed, low jitter low voltage differential signaling (LVDS) output driver for high speed serial transmission is presented. Based on the comparison among four typical output driver architectures and the analysis of the output signal swing, an additional differential termination is addressed at the source of the driver to improve the signal integrity (SI). The stipulated common mode voltage is achieved over process, voltage, temperature (PVT) variations without trimming methodology, by means of a common mode feedback (CMFB) circuit and a novel high order temperature compensation bandgap reference. The simulation results show the temperature coefficient (TC) of the bandgap is only 1.77 ppm/°C. The whole driver circuit is implemented in SMIC 0.18 μm CMOS technology. It provides an output differential mode voltage of 567 mV and a common mode voltage of 1.201 V at 2 Gbps, and consumes 15.41 mA total current with a 2.5 V power supply. The output root mean square (RMS) jitter of the driver is only 7.65 ps.Analog Integrated Circuits and Signal Processing 09/2011; 68(3):387-395. DOI:10.1007/s10470-011-9658-x · 0.40 Impact Factor
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ABSTRACT: In this paper, the differential- and common-mode characteristics of coupled interconnect transmission lines are presented using four-port scattering parameter (S-parameter) measurements for a section of coupled line, a series resistor and a shunt resistor, where the impedances of the resistors need not to know. Firstly, the differential- and common-mode propagation constants are solved by the determining equations consisted of three measured differential/common mode transmission matrixes, in which the transition and parasitic effects between the coaxial connectors and the coupled lines can be removed. With the low conductance loss condition for the substrate, the differential/common mode characteristic impedances can be further determined by the propagation constants and the unit-length capacitances which are measured by the dc resistance and low frequency reflection data of the series/shunt test key. The measured results for the coupled microstrip lines on FR-4 substrates are shown from 40 MHz to 8.5 GHz with comparisons of the other measurement method.01/2010; DOI:10.1109/IMPACT.2010.5699644