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This paper demonstrates the design of a radio frequency (RF) class A power amplifiers for WiMAX application using TSMC 0.18μm CMOS technology. A novel two-stage cascode common-source amplifier and a load-pull output matched power amplifier are designed for the WiMAX application of 2.5 GHz transmitting frequency. The designed power amplifier exhibits 19.8 dBm of 1-dB compression point, 24.1 dBm of...
In this paper, a modified magic-T using substrate integrated waveguide (SIW) and slotline is proposed and developed for RF/microwave applications on the basis of the substrate integrated circuits (SICs) concept. The modified planar magic-T consists of an 180° phase-reversal T-junction and an H-plane SIW T-junction. An optimized wideband magic-T structure is demonstrated and fabricated. Measurement...
Open-ended stub loaded parallel coupled short-circuited three-line structure is proposed to realize a new wideband bandpass filter. The characteristics of the new coupling unit were firstly investigated based on simulation, followed by proposing a two-step design scheme: 1. A Chebyshev filter is synthesized on the desired passband, using symmetric three-line coupling units. 2. The transmission zeros...
Convex optimization problems are very popular in the VLSI design society due to their guaranteed convergence to a global optimal point. While optimizing tabular data, significant fitting efforts are required to fit the data into convex form. Fitting the tables into analytically convex forms like posynomials, suffers from excessive fitting errors, as the fitting problem may be non-convex. In recent...
Convex-optimization techniques are very popular in the very large-scale-integration design society due to their guaranteed convergence to a global optimal point. The table data need to be fitted into convex forms to be used in the convex optimization problems. Fitting the tables into polynomials, which are analytically convex under logarithmic transformation, may suffer from the excessive fitting...
State of the art statistical timing analysis (STA) tools often yield less accurate results when timing variables become correlated. Spatial correlation and correlation caused by path reconvergence are among those which are most difficult to deal with. Existing methods treating these correlations will either suffer from high computational complexity or significant errors. In this paper, we present...
This paper presents a new tracking circuit design without standby leakage current issue for 2.5V/3.3V tolerant I/O buffer, which is suitable for the I/O cells in the mixed-voltage applications with different driving capabilities. One set of mixed-voltage I/O cell with the new proposed 2.5V/3.3V tolerant I/O buffer circuit has been designed and drawn in a 0.13-mum salicided CMOS process. The new tracking...
Simultaneous gate-sizing with multiple V/sub t/ assignment for delay and power optimization is a complicated task in modern custom designs. In this work, we make the key contribution of a novel gate-sizing and multi-V/sub t/ assignment technique based on generalized Lagrangian relaxation. Experimental results show that our technique exhibits linear runtime and memory usage, and can effectively tune...
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