Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

2006-05-23

2006-05-23

Vuong, Quochien B. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S323000, C455S339000, C455S253200

Reexamination Certificate

active

07050779

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 T1to T6. Each of the transistors T1to T4is con figured so that four transistors may be connected in parallel. In a layout on a semiconductor chip, four transistors T1ato T1dand T2ato T2drespectively constituting the transistors T1and T2are 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 T3ato T3dand T4ato T4drespectively constituting the transistors T3and T4are 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 T1to T4is uniformed.

REFERENCES:
patent: 5758271 (1998-05-01), Rich et al.
patent: 6230001 (2001-05-01), Wyse
patent: 6696879 (2004-02-01), O'Toole et al.
patent: 6763228 (2004-07-01), Prentice et al.

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