Mixer with balanced local oscillator signal
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United States of America Patent
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Nov 10, 2009
Grant Date -
Jul 30, 2009
app pub date -
Jan 24, 2008
filing date -
Jan 24, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A mixer includes a first field effect transistor (FET) having a gate that receives a first signal of a balanced local oscillator (LO) signal, a first source/drain coupled to a ground voltage, and a second source/drain; and a second FET having a gate that receives a second signal of the balanced LO signal, a first source/drain that floats, and a second source/drain connected to the second source/drain of the first FET to form a mixing node, the second signal being out of phase with the first signal. A diplexer is connected between the mixing node and each of a radio frequency (RF) port and an intermediate frequency (IF) port. A first LO leakage caused by the first FET is substantially canceled by a second LO leakage caused by the second FET at the mixing node.
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