A Study of Phase-Adjusting Architectures for Low-Phase-Noise Quadrature Voltage-Controlled Oscillators

A Phase Noise Reduction Technique in LC Cross-coupled Oscillators with Adjusting Transistors Operating Regions

In this paper, an intuitive analysis of a phase noise reduction technique is done, and then a modified structure is proposed to achieve higher phase noise reduction than the original one. This method reduces the impact of noise sources on the phase noise by decreasing closed-loop gain in zero-crossings points and moving this high closed-loop gain to the non-zero-crossings points. This reduction...

Concept of phase-noise tuning of bipolar voltage-controlled oscillators

So far, oscillators have been designed to perform a specific task while the key parameters such as phase-noise and power consumption are set by the hardware design and not by the communication system in an adaptive way. As the communication channel is often subject to changes, the conditions under which the oscillator operates should be changed as well. Therefore, the concept of design for adap...

Low Phase Noise Voltage - Controlled Oscillator

A Low Power Low Phase Noise Lc Voltage- Controlled Oscillator

A low phase noise CMOS complementary cross-coupled LC-tank voltage-controlled oscillator (VCO), implemented with TSMC 0.18μm 1P6M CMOS technology, is presented. Double pair pseudoresistance transistors biased by the tapped center of the inductor are utilized to reduce the DC bias current. The circuit consumes 1.55 mA from a 1.5 V supply voltage which saves up to 52.4% power, compared with the c...

Wide Tuning Band Low Phase Noise LC Voltage Controlled Oscillators Designed in Low Cost CMOS Technologies

This paper demonstrates the feasibility of implementing wide tuning band low phase noise oscillators in low cost Sibased integration technologies. For that, it is necessary to use radio-frequency switched capacitors arrays (RFSCA) and differentially tuned anti-parallel varactors. To corroborate this idea, a voltage controlled oscillator (VCO), designed in a low cost 0.35 μm CMOS technology, is ...