g10rg1 /   ADC_LogiCompilation_gf180

Created
Maintained by g10rg1
Compilation of 3 different Digital Logic Circuits topologies for ADC control: Flash (3-bit output) and SAR (Conventional and Monotonic Switching with 10-bit output)
Members 1
Jangarita committed 5 months ago

ADC LogiCompilation

License UPRJ_CI Caravel Build

Project Description:

Compilation of three different ADC digital logics for GFMPW-1. TThe simplified input/output schematic is as follows:

Schematic

When the Test is turned ON, the internal circuits switch to comparison mode, and the output varies based on InputComp. If Test is off, the output remains zero.

Using Selector, users can switch between 4 different modes:

  • Off (Selector = 00): No design is active.
  • Flash (Selector = 01): It utilizes a thermometer code from seven comparators and generates a 3-bit output using a simple decoder. If the input code is invalid, outputs B and BN are set to 0 and 1 respectively.

Flash

  • Conventional SAR (Selector = 10): This takes a 10-bit input from comparator and introduces it as a sequence. Each clock cycle uses each bit to determine its corresponding output, with the next bit being set to 1. After 10 cycles, the 10-bit output is defined.
  • Monotonic SAR (Selector = 11): Similar to conventional SAR logic, but it doesn’t set the next iteration's bit to 1. This creates different consequences in the complete implementation, altering the switching scheme. However, in this case, such alterations are not expected, and the output is anticipated to be similar to the conventional example.

SAR

Final GDS Result in Klayout:

GDS