Semiconductor integrated circuit device
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United States of America Patent
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May 23, 2006
Grant Date -
Sep 16, 2004
app pub date -
Mar 31, 2003
filing date -
Mar 12, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The thermal interference due to the self heating of transistors constituting a gilbert cell circuit is reduced, thereby largely improving the receiving sensitivity to signals. A mixer circuit composed of a gilbert cell circuit comprises transistors T1 to T6. Each of the transistors T1 to T4 is con figured so that four transistors may be connected in parallel. In a layout on a semiconductor chip, four transistors T1a to T1d and T2a to T2d respectively constituting the transistors T1 and T2 are respectively separated into two pairs, and the respective two pairs are laid out in a crisscross shape so that they are crossed with each other. Similarly, four transistors T3a to T3d and T4a to T4d respectively constituting the transistors T3 and T4 are respectively separated into two pairs, and the respective two pairs are laid out in a crisscross shape so that they are crossed with each other. Thus, the thermal influence applied on the transistors T1 to T4 is uniformed.
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