Chien-Nan Kuo

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This paper presents a comprehensive full-wave analysis of packaged nonlinear active microwave circuits by applying the extended finite-difference time-domain (FDTD) method. Based on the approach of using equivalent sources, the device–wave interaction is characterized and incorporated into the FDTD time-marching scheme. As a consequence, analysis of linear(More)
A new low-power CMOS active balun is designed for ultra-wideband applications, using a pair of common-source NMOS and common-gate PMOS transistors. This balun gives an impedance transformation ratio of 1:2. Without compensation feedback, the circuit provides a differential signal within 2dB and 3deg of gain and phase imbalance, respectively, up to 8-GHz.(More)
A 250 MHz analog baseband chain for Ultra-Wideband was implemented in a 1.2 V 0.13 m CMOS process. The chip has an active area of 0.8 mm . In the analog baseband, PGAs and filters are carried out by current-mode amplifiers to achieve wide bandwidth and wide dynamic range of gain, as well as low noise and high linearity. Besides, a current-mode Sallen–Key(More)
A CMOS reconfigurable LNA is reported. By combination of switched inductors and varactors it performs continuous frequency tuning from 2.4 to 5.4 GHz with 500 MHz 3 dB-bandwidth. Switching transistor is used to provide variable gain control over a 12 dB-range. The LNA supports standards including Bluetooth, WiMAX, UWB mode-1, 802.11 b/g and part of 802.11a.(More)
This paper presents the on-chip transmission line modeling and applications to circuit design at millimeter-wave (ram-wave) frequencies. The microstrip model of circuit simulators benefits in fast calculations of the characteristics of microstrip lines. As the structure of on-chip microstrip differs from the modeled structure, two key parameters of the(More)
A 2.4-5.4-GHz CMOS reconfigurable low-noise amplifier (LNA) is designed. It consists of two stages: a broadband input stage for a steady input matching and noise performance, and a reconfigurable band-selective stage which provides a wide-range frequency tuning from 2.4 to 5.4 GHz and a 12-dB stepped gain with linearity adjustment. The frequency tuning is(More)
A 1.5 V, 3~11 GHz CMOS UWB LNA using dual feedback loops is reported. Using shunt capacitive feedback and series transformer feedback the broadband matching condition is achieved with high flat gain. Fabricated in 0.18 mum CMOS process, the measurement result demonstrates power gain of 11 dB and maximum NF less than 5.6 dB throughout the frequency range(More)
The simultaneous noise and impedance matching (SNIM) condition for a common-source amplifier is analyzed. Transistor noise parameters are derived based on the more complete hybrid-¿ model, and the dominant factors jeopardizing SNIM are identified. Strategies for narrowband and broadband SNIM (BSNIM) are derived accordingly. A dual reactive feedback circuit(More)
In this study, a low-power and low-voltage 5.5-GHz receiver front-end circuit is designed using a resonator coupling technique. An on-chip transformer combined with the parasitic capacitances from a low-noise amplifier (LNA), a mixer, and the transformer itself comprises two coupled resonators of the resonator coupling network (RCN). The RCN functions as a(More)