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This letter presents the design of a symmetrical Doherty power amplifier (DPA) with extended high-efficiency range by using a new and explicit circuit model. Theoretical analysis reveals that by the adjustment of the electrical length of transmission line sections in the proposed circuit model, new DPA variants with simple circuitry and enhanced output back-off (OBO) are obtained. For experimental...
This paper presents a statistical model-fitting framework to efficiently decompose the impact of device Vt variation and power-network IR drop from the measured ring-oscillator frequencies without adding any extra circuitry to the original ring oscillators. The framework applies Gaussian process regression as its core model-fitting technique and stepwise regression as a pre-process to select significant...
This paper presents a high-speed energy-efficient analog-to-digital converter (ADC) with two-channel time-interleaving on an asynchronous pipelined-flash architecture for each channel. With use of multiple sampling paths as well as asynchronous control by a low-power 6-phase clock generation, the proposed ADC eliminates power-hungry and bandwidth-limited residue amplifiers without sacrificing the...
A metamaterial-based zero-phase coupler (ZPC) is proposed for coupled oscillator network (CON) to build high output power density and low phase noise 60GHz signal source in CMOS. The ZPC itself is both high-Q resonator and low-loss zero-phase shifter. The unit-cell oscillator of CON can be implemented by the ZPC, which has minimized loss for in-phase coupling when connecting with other ZPC-based unit-cells...
A CMOS 60GHz injection-locked frequency divider (ILFD) is demonstrated in this paper by introducing a wide-frequency-range switching-inductor loaded transformer. With different switching conditions, multi-band operation can be realized to improve the locking range with low power consumption and compact area. The 60GHz ILFD together with the entire divider chain is implemented in 65nm CMOS process...
With the use of tunable composite-right/left-hand (CRLH) transmission line (T-line), this paper provides a wide frequency-tuning-range (FTR) mechanism for Mobius-ring rotary-traveling-wave (RTW) VCO in millimeter-wave region. CRLH T-line is implemented in RTW-VCO with inductor-loaded transformer to realize sub-band selection over a wide FTR. Each sub-band is further covered by a varactor for fine-tuning...
Towards wide bandwidth and high output power density for 60GHz PA design in 65nm CMOS, this paper introduces a 2D differential power combining network by metamaterial-based zero-phase-shifter. Simultaneous distributed amplification and power combining can be achieved with improved performances in both power density and bandwidth. The PA measurement results show 13.2 dB gain, 8.7% PAE, 13dBm P1dB,...
With the use of metamaterial based zero-phase-shifter, a 2D distributed power combining network is developed to provide distributed amplification and power combining simultaneously. Measured results show that the fabricated PA has 8.3dB gain, 7.1% PAE, and 9.7dBm P1dB with 16GHz bandwidth (44 to 60GHz).
The novel design of broadband and triple-band T-type monopole antenna for WiMAX applications has been proposed and studied. The proposed antenna has a compact size of 28 times 26.4 mm2. For the wideband performance of the proposed antenna, the dimensions of the notches on the ground plane and the T-type radiation patch have been studied by parameter analysis. Furthermore, embedded a narrow inverted-L...
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