Browsing by Author "Wu, Kuan-I"

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A-194 dBc/Hz FOM Interactive Current-Reused QVCO (ICR-QVCO) with Capacitor-Coupling Self-Switching Sinusoidal Current Biasing (CSSCB) Phase Noise Reduction Technique
(2015)
Wu, Kuan-I
;
Shen, I-Shing
;
Jou, Christina F.
;
Chen, Charlie Chung-Ping
;
電信工程研究所
This paper proposed a novel interactive current-reused QVCO (ICR-QVCO) architecture based on capacitor-coupling self-switching sinusoidal current biasing (CSSCB) phase noise reduction technique. These interactive generated quadrature outputs have minimum phase error arising from the mismatch due to process variation and construct the better quadrature phase relationship than ones with conventional QVCO structures. The measured phase noise at an offset of 1 MHz from 4.84 GHz is -125.84 dBc/Hz, which correspond to FOM of -194 dBc/Hz.
Back-Gate Coupled Current-Reused QVCO with Modified STM Technique
(2010-01-01)
Chiu, Po-Ju
;
Wu, Kuan-I
;
Jou, Christina F.
;
電信工程研究所
;
Institute of Communications Engineering
In order to achieve low power consumption, many improved VCO schematics were proposed. However, although the problem of power consumption has been improved, the amplitude imbalance of the output signals is relatively larger than the conventional cross-coupled VCO. Therefore, a new modified STM technique to improve the amplitude imbalance of VCO is presented. The measured amplitude imbalance ratio is less than 0.2%. It reduces from 1.7% of the VCO without modified STM technique. This back-gate coupled current-reused QVCO has been implemented using the TSMC 0.18um mixed signal/RF CMOS IP6M technology and the die area is 0.84x1.1mm(2). The measured phase noise at 1MHz offset is 117.4dBc/Hz at the oscillation frequency of 5.0 GHz. The figure of merit (FOM) of the proposed QVCO is -184.1 dBc/Hz.