GILBERT MIXER WITH NEGATIVE GM TO INCREASE NMOS MIXER CONVERSION

Cross coupled NMOS transistors providing a negative gm transistor feedback allows a mixer to saturate as a reduced input signal swing voltage when compared to a conventional mixer allowing the mixer to enter into the current mode operation at a reduced signal input voltage range. The linearity of th...

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Bibliographic Details
Main Authors KHONGMENG THAM, SOE ZAW
Format Patent
LanguageEnglish
Published 11.09.2014
Subjects
ANALOGUE COMPUTERS
CALCULATING
COMPUTING
COUNTING
PHYSICS
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Summary:Cross coupled NMOS transistors providing a negative gm transistor feedback allows a mixer to saturate as a reduced input signal swing voltage when compared to a conventional mixer allowing the mixer to enter into the current mode operation at a reduced signal input voltage range. The linearity of the baseband signal path can be traded against the mixer gain and is improved if the signal swing in the baseband signal path is reduced. The input mixer transistors operate in the saturated mode at a reduced input signal swing voltage causing the power efficiency of the system to increase since the transmit chain operates at a class-D power efficient. Efficiency is very important in mobile applications to save and extend the battery power of a mobile phone providing a better utilization of the available power since most of that power is supplied to the energy of the outgoing modulated signal.
Bibliography:Application Number: US201313789681