An integrated 0.38-6 GHz, 9-12 GHz fully differential fractional-N frequency synthesizer for multi-standard reconfigurable MIMO communication application

摘要

Due to user expectations, modern data terminals, such as mobile phone terminals, are required to support multiple modes and multiple standards, such as WLAN 802.1 la/b/g, GSM-900, PCS/DCS, and MICS. Data instruments require an adjustable stable frequency source with low noise, which can be implemented in a small wafer area. This paper, which could be of interest to designers of integrated circuits and their applications, presents a design of an N-frequency synthesizer, which is tunable in the ranges 0.38 to 6 GHz and 9 to 12 GHz. The design sources base reference frequency from a single 9.0 to 12.0 GHz voltage-controlled oscillator (VCO) and uses a multi-stage multiplexer coupled to a multi-band "divide by N" block.