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An ultra-wideband sub-THz signal generation system is proposed for rotational spectroscopy employing a magnetic-tuning varactor-less quad-band voltage-controlled oscillator (QB-VCO), a locking-range-enhanced dual-mode injection-locked frequency divider (DM-ILFD), a power-efficient injection-locked oscillator (ILO) as a driver, and sub-THz mixers with frequency multipliers for frequency extension....
Several transformer-based techniques are proposed to enhance the frequency tuning range of mm-wave voltage-controlled oscillators (VCOs) and the frequency locking range of injection-locked frequency dividers (ILFDs). Firstly, a switched-transformer VCO (ST-VCO) based on dual-band topology is proposed to increase the frequency tuning range. Secondly, transformer-distribution ILFDs (TD-ILFDs) are demonstrated...
An ultra-low-power millimeter-wave injection-locked frequency divider (ILFD) based on transformer-feedback and transformer-distribution technique is proposed to operate with a very small injection signal. The proposed ILFD measures a locking range from 60.9GHz to 64.7GHz with −7dBm input power while consuming 440uW, which features the minimum power consumption among all the reported V-band frequency...
A self-frequency-tracking (SFT) transformer-based injection-locked frequency divider (ILFD) with enhanced frequency locking range is presented. The SFT technique creates a frequency-dependent phase shift for the total current injected into the transformer tank to relax both the phase and gain conditions. Fabricated in a 65nm CMOS process, the presented SFT-ILFD achieves an input locking range of 29%...
A frequency-tracking technique together with a single-coil distributed differential inductor is proposed to enhance the locking range of mm-Wave injection-locked frequency dividers (ILFDs). Implemented in a 65nm CMOS process, the proposed ILFD measures a locking range of 39.2% from 53.4GHz to 79.4GHz and consumes 2.9mW from a 0.8V supply corresponding to FOM of 8.97 GHz/mW while occupying an area...
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