Rapid layout of a continuous-time transconductance-C filter

Automatic Synthesis of VLSI Layout for Analog Continuous-time Filters

“…By "routing'' the cells with a predesigned tile, the desired amount of node capacitance can be predistorted according to the amount of parasitic Once a continuous fraction is obtained, it may be used as one form of input for OTACC. The input grammar used is described in [19]. Continuing with the third-order elliptic filter example, the input stream would look like Figure 12: Once the filter is laid out, an input source transformation is added to the filter's input, and a load resistor is added to the filter's output.…”

“…Since routing is included in the tiles, the route operation is static. Routing occurs simply by abutting two or more tiles together [17,19] as shown in Figure 7. The disadvantage to this approach is library maintenance.…”