Naval Postgraduate School
A study of a broadband balanced-bridge switching-state MOSFET mixer.
studyofbroadband00yeni.pdf (3.512Mb)Abstract
A theory for a mixer using four MOSFETs in a broadband
balanced-bridge configuration has been developed in terms of
both ideal models and approximate representations for departures
from the ideal case. An interfering signal is assumed
to be present in order to analyze intermodulation and cross-modulation
distortions. The mathematics of a MOSFET mixer are developed and
compared with the conversion properties and intermodulation
limitations of the simple nonlinear-resistance mixer. Measurements are made in the 10-200 MHz range and close
agreement with the theory is found for conversion loss.
Disagreement in RF and LO isolations is attributed to stray
capacitances and impedance mismatching. It is also shown
that circuit-board and transformer design greatly affects
performance of a mixer. A comparison of MOSFET and hot-carrier diode double
balanced mixers is given and it is indicated that the MOSFET
mixer is superior in conversion loss and RF and LO isolations.
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