Low phase noise, high bandwidth frequency synthesis techniques
Year: 2005
Type: article
Abstract: A quantization noise reduction technique is proposed that allows fractional-N fre-quency synthesizers to achieve high closed loop bandwidth and low output phase noise simultaneously. Quantization induced phase noise is the bottleneck in state-of-the-art synthesizer design, and results in a noise-bandwidth tradeoff that typically limits closed loop synthesizer bandwidths to be <100kHz for adequate phase noise performance to be achieved. Using the proposed technique, quantization noise is re-duced to the point where intrinsic noise sources (VCO, charge-pump, reference and PFD noise) ultimately limit noise performance. An analytical model that draws an analogy between fractional-N frequency syn-thesizers and MASH EA digital-to-analog converters is proposed. Calculated per-formance of a synthesizer implementing the proposed quantization noise reduction techniques shows excellent agreement with simulation results of a behavioral model. Behavioral modeling techniques that progressively incorporate non-ideal circuit be-havior based on SPICE level simulations are proposed.
Author: Scott Meninger
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1513090473