I/Q quadraphase modulator circuit
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United States of America Patent
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-
Nov 12, 1996
Grant Date -
N/A
app pub date -
Jan 25, 1994
filing date -
Jan 25, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An I/Q quadraphase modulator circuit for correcting phase errors of, typically, LO input quadrature signals. The circuit uses a pair of Gilbert cell multipliers, to the bottom ports of which are applied I and Q signals, and to the top ports of which are applied sum and difference, limited, quadrature, differential signals. The result is to make the circuit less sensitive to LO phase errors and thus to improve sideband (image) rejection over the conventional circuit typically using one Gilbert cell multiplier.
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