271 TT05 Analog Testmacro (Ringo, DAC)

271 : TT05 Analog Testmacro (Ringo, DAC)

  • Author: Harald Pretl and Jakob Ratschenberger
  • Description: For future analog enablement of TinyTapeout we designed a few simple analog blocks for testing the flow. The first block is a ca. 500kHz ring oscillator outputting a square-wave signal. The second block is a 3bit R-2R DAC outputting a programmable dc voltage. Both analog output signals can be gated or shorted using integrated transmission gates. To add a further level of madness, we have placed and routed this analog macro using an experimental automatic analog PnR tool, currently under development by the authors.
  • GitHub repository
  • Clock: 0 Hz

How it works

A ring oscillator (ca. 500kHz) produces a square-wave signal available at UA[0]. A 3-bit R-2R DAC produces a dc voltage availabel at UA[1].

How to test

Enable the respective blocks, and enable the transmission gates to connect the block outputs to UA[0] and UA[1], respectively. The DAC voltage can be changed by setting the digital inputs accordingly.

External hardware

scope, multimeter

IO

#InputOutputBidirectional
0
1
2
3
4
5
6
7

Chip location

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