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

Abstract

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 adaptivity must be considered as a comerstone in the design of today's telecommunication systems. Accordingly, the concept of phasenoise tuning, introduced in this paper, shows how oscillators can trade performance for power consumption in an adaptive way. The presented model of a quasi-tapped bipolar VCO reveals the resulting trade-offs between phase-noise and power consumption imposed by the design for adaptivity.

Design of multistandard adaptive voltage-controlled oscillators

“…With the aid of (6), (10), and (16), the contribution of the transconductor shot noise becomes (17) The same result would be obtained if switching of the shot noise is considered. Namely, the transconductor shot noise, when both transistors are active, turns on and off with the rate of the transfer function (Fig.…”

“…This allows adaptation of the oscillator phase noise to different specifications. The phenomenon is named phase-noise tuning [10], while the figure-ofmerit describing the oscillator's adaptivity to phase noise is the phase-noise tuning range (PNTR). For a -times change in power consumption, the PNTR is defined as (32) Once the minimum and maximum attainable loop gains are known, the ranges of the power-consumption and phase-noise adaptation can be determined.…”

Adaptivity of voltage-controlled oscillators - theory and design

“…The concept of phase-noise tuning [6] shows explicitly how phase noise and power consumption trade between each other in an adaptive way.…”

“…Therefore, explicit qualitative and quantitative descriptions [6], [7] of the existing relationships and tradeoffs between VCO performance parameters are outlined in this paper.…”

DCS1800/WCDMA adaptive voltage-controlled oscillator

“…This phenomenon is named phase-noise tuning [3], and the figure describing the oscillator's phase-noise adaptivity is named phase-noise tuning range. However, before elaborating on the aspect of phase-noise tuning, let us first briefly describe the conditions for noisefree biasing.…”