NDLI: A CMOS Quadrature LC Oscillator using Automatic Phase/Amplitude Calibration

Content Provider	Springer Nature Link
Author	Ghoodi, Hojat Naimi, Hossein Miar
Copyright Year	2011
Abstract	In this paper, a novel LC quadrature oscillator (QO) is presented that can simply and automatically cancel the phase and amplitude errors raised by mismatches in LC tanks; the major source of phase and amplitude errors. The design is based on method of using unequal coupling factors in a parallel quadrature oscillator (P-QO). This method shows how we can cancel phase and amplitude errors simultaneously by choosing appropriate inversely proportional coupling factors. To cancel the errors, the proposed circuits first sense the phase error and increase or decrease the difference between the coupling factors accordingly. When tuning tail currents, the coupling factors can be simply adjusted. The entire system has a block diagram like a PLL. The dynamics of the proposed circuit is analyzed, and it is shown how the phase and amplitude error is canceled in response to an imposed LC tank mismatch. To evaluate the circuit, a QO has been designed to oscillate at 5 GHz with 1.8 V supply and 6.2 mA current consumption. The circuit has been simulated using TSMC 0.18 CMOS practical model where all the results confirm the analytical results.
Starting Page	77
Ending Page	91
Page Count	15
File Format	PDF
ISSN	0278081X
Journal	Circuits, Systems, and Signal Processing
Volume Number	31
Issue Number	1
e-ISSN	15315878
Language	English
Publisher	SP Birkhäuser Verlag Boston
Publisher Date	2011-05-25
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Local oscillator (LO) I/Q errors RF CMOS Auto-Calibration Electronics and Microelectronics, Instrumentation Circuits and Systems Signal, Image and Speech Processing Electrical Engineering
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Signal Processing

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