| 摘要 |
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 T 1 to T 6 . Each of the transistors T 1 to T 4 is con figured so that four transistors may be connected in parallel. In a layout on a semiconductor chip, four transistors T 1 a to T 1 d and T 2 a to T 2 d respectively constituting the transistors T 1 and T 2 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 T 3 a to T 3 d and T 4 a to T 4 d respectively constituting the transistors T 3 and T 4 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 T 1 to T 4 is uniformed.
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