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An octa-phase differential relaxation VCO generating both triangular and rectangular waveform outputs is designed for 8-PSK subcarrier generation in FM-UWB transceiver systems. The VCO consists of cascaded quad-phase relaxation oscillators in which the second stage oscillator provides 45° phase shifting with pseudo injection locking. The 5.2-11.8MHz octa-phase VCO implemented in 0.18μm CMOS consumes...
A 65 nm CMOS sliding-IF receiver comprising 3 LNA gain stages, RF mixer, quadrature IF mixers, VCO and dividers is presented. Coupled resonators, both in the LNA and RF mixer, allow an important gain-bandwidth extension over conventional single LC neutralization. Realized prototypes show >13 GHz RF bandwidth around 60 GHz, <6.5 dB NF, -21 dBm P1dB, 12.6% VCO frequency range, and -115 dBc/Hz...
This paper presents a novel wideband voltage-controlled oscillator (VCO) and a tunable power amplifier (PA) for multi-band transceivers. The proposed oscillator has a core VCO and a tuning-range extension circuit, which consists of an injection-locked frequency divider (ILFD), and flip flop dividers. The 2-stage differential ILFD can generate quadrature outputs, and it realizes 2, 3, 4, and 6 of divide...
This paper presents a local oscillation (LO) distribution network for the purpose of power splitting and distribution from a voltage-controlled oscillator (VCO) to a transmitter (Tx), receiver (Rx) and phase-locked loop (PLL) frequency synthesizer for an on-chip 60-GHz transceiver. The proposed LO distribution network architecture includes one input port and three output ports. The network circuit...
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