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
Graphical communication user interface with graphical position user input mechanism for selecting a display image
Digital broadcast receiver and method for processing caption thereof
Integrating map-reduce into a distributed relational database
PC secure video path
Antenna tuning on an impedance trajectory
Methods and apparatus for preserving privacy in an RFID system
Solid state lighting devices and associated methods of manufacturing
  Randomly Featured Patents
Data control system for a computer's main memory for efficiently realizing virtualization of list structure data lying across a real memory space and a virtual memory space
Manufacture of methane
Method for producing an acid and/or alkali metal hydroxide
Method for making a mottled and patterned pen barrel
Periodic pulsed heat technique for inducing analgesic effects
System and method for providing and using universally accessible voice and speech data files
Bar primarily intended for glazing
Integrated circuit and method of operating an integrated circuit
GPS navigation code system
Hydrosilylation catalyst and hydrosilylation method