Physical processes of phase noise in differential LC oscillators - Custom Integrated Circuits Conference, 2000. CICC. Proceedings of the IEEE 2000

A 5.8nW, 45ppm/°C on-chip CMOS wake-up timer using a constant charge subtraction scheme

This work presents an ultra-low power oscillator designed for wake-up timers in compact wireless sensors. A constant charge subtraction scheme removes continuous comparator delay from the oscillation period, which is the source of temperature dependence in conventional RC relaxation oscillators. This relaxes comparator design constraints, enabling low power operation. In 0.18µm CMOS, the oscill...

Guest Editorial - Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on

S IGNAL integrity has become one of the most critical issues in deep submicrometer (DSM) design today. It refers to a general requirement that signals in digital and mixed-signal circuits remain within some specified margins and are tolerant to noise of any kind, so as to minimize data errors. With the continuous reduction of feature size and the consequent explosion of circuit complexity, it h...

2012 IEEE Custom Integrated Circuits Conference (CICC 2012) : San Jose, California, USA, 9 - 12 September 2012

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...

ISSCC 2001 / SESSION 23 / ANALOG TECHNIQUES / 23 . 4 23 . 4 A Filtering Technique to Lower Oscillator Phase Noise

Wireless applications are pushing the required phase noise in integrated oscillators to ever lower levels. Integrated oscillator circuits published so far use tuning inductors that are either fully integrated, partly integrated, or discrete, with quality factors spanning a large range. However, lacking a clear understanding of the physical processes of phase noise, it is difficult to compare th...