Resources Contact Us Home
Semiconductor integrated circuit using standardized analog cells

Image Number 7 for United States Patent #5801407.

An analog-circuit block, which is fabricated on a chip of a semiconductor integrated circuit, is configured by a plurality of analog cells each having a desired function such as the function of an operational amplifier. The analog cells are standardized with respect to the height thereof. Two power-source wires are provided respectively in an upper-end section and a lower-end section of the analog-circuit block, so that they are commonly used by the analog cells. In the analog cell, input/output wires are placed in a direction perpendicular to the power-source wires. For example, two input wires are provided to input signals for two inputs of an operational amplifier while one output wire is provided to provide an output signal, wherein one of the two input wires is partially connected to the output wire. Further, it is possible to provide a dummy wire which is placed in parallel with the output wire, wherein a midpoint of the output wire is connected to a midpoint of the dummy wire. Because of the provision of the dummy wire, it is possible to suppress interference between circuits. Moreover, the analog cell is surrounded by a guard-ring diffusion layer; and there are provided guard-ring wires to contact with the guard-ring diffusion layer, so that propagation of noise is avoided.

  Recently Added Patents
Light irradiation element, image forming structure, and image forming apparatus
Late loading rich media
Integrated monitoring in problem management in service desk
System and method for dynamic quality-of-service-based billing in a peer-to-peer network
Composite materials comprising aggregate and an elastomeric composition
Multi-carrier operation for wireless systems
  Randomly Featured Patents
Robust mode staggercasting without artifacts
High frequency induction log for locating formation interfaces
Sample conditioning system for an off-gas monitor panel
Semiconductor device and method for manufacturing same
Optical disc, recording apparatus, and computer-readable recording medium
Process for preparing natural benzaldehyde and acetaldehyde, natural benzaldehyde and acetaldehyde compositions, products produced thereby and organoleptic utilities therefor
Random access in time division duplex communication systems
Method and apparatus using primitive bounding volumes to improve the accuracy of BSP-trees
Latent catalysts for the isocyanate polyaddition reaction
Acylsulfonamide derivatives