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Title Wide Tuning-range LO Chain with a Hybrid Inductor for LTE and SAW-less GSM Transceiver
Authors (Seonghan Ryu)
Page pp.490-495
ISSN 2287-5255
Keywords CMOS; Phase noise; Wide tuning range; Hybrid inductor
Abstract A low phase noise, multi-standard local oscillator (LO) chain for LTE and GSM is presented. The LO chain is composed of a dynamic divider and a CMOS VCO with a hybrid inductor using both bondwire and a planar spiral inductor in the same area. This approach improves both tuning range and phase noise characteristics without additional area loss. Based on this concept, the LO chain with a hybrid inductor VCO is implemented in a 65nm CMOS process. The measured performance satisfies wide tunability and most stringent GSM transmitter phase noise specification, which proves that the LO chain can be used for LTE and SAW-less GSM transceiver.