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A 76 dB-0 hm 1.7 GHz tunable CMOS TIA in 0.18 μm CMOS for lateral micromechanical oscillators is presented. The 7.2 mW TIA uses a low-power broadband current pre-amplifier for gain boosting (loading > 2 pF). The TIA is interfaced with 724 MHz and 1.006 GHz resonators and achieves phase noise better than -87 dBc/Hz and -94 dBc/Hz at 1 kHz offset, respectively.
This paper presents a 2.1/3.9 GHz oscillator based on switching the negative resistance bandwidth of a capacitively degenerated common collector stage, while using a high order resonance tank. Multi-band oscillators have traditionally been implemented by reconfiguring the oscillator tank. In this paper, we employ a fixed high order resonator, and move the bandswitching mechanism from the tank to the...
This paper describes theoretical as well as practical aspects in designing low phase noise LC CMOS oscillators. It starts with an overview of the different oscillator performance parameters found in a typical oscillator specification sheet. It also describes the LC-tank oscillation phenomena by analyzing a simplified LC oscillator circuit. Oscillator phase noise analysis is then introduced as a logical...
An in-depth study of CMOS transconductor designed negative resistance circuits is presented. Important large signal and small signal characteristics including noise, stability and bandwidth are investigated. A strategy of designing large bandwidth active resistors is proposed with supporting analysis. Key stability issues that have not previously been reported are discussed. Finally, applications...
This paper reports on the first demonstration of multi-frequency (176, 222, 307, and 482 MHz) oscillators based on piezoelectric AlN contour-mode MEMS resonators. All the oscillators show phase noise values between -88 and -68 dBc/Hz at 1 kHz offset and phase noise floors as low as -160 dBc/Hz at 1 MHz offset. The same Pierce circuit design is employed to sustain oscillations at the 4 different frequencies,...
A CMOS LC oscillator based on the mutual negative resistance (mu-R) with a top-biasing current source is presented. It offers superior phase noise over the traditional top-biased cross-coupled oscillator due to the indirect mutual coupling that results in a suppression of the LC resonator loading by the amplifier transistors. The top-biased mu-R structure also enables a low power quadrature oscillator...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
As the tuning range of integrated LC-VCOs increases, it becomes difficult to co-design the active negative resistance core and the varactor size optimally for the complete frequency range. The presented VCO design solves this by adjusting the size of the negative resistance transistors with a switched active core, with the additional benefit that this reduces parasitics and hence allows to achieve...
A low phase noise and highly tunable 5.15-GHz LC VCO is presented and analyzed. The phase noise achieved is -97 and -118 dBc/Hz at 100 KHz and 1 MHz offsets respectively from the carrier frequency of 5.15 GHz, with 2.5 V power supply voltage and giving a low power consumption of 11.4 mW by considering the proposed oscillator topology, which exhibits less power consumption than the traditional VCO...
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