Name: T Akshaya
BITS Pilani Hyderabad Campus

The circuit I chose was a 3 bit DAC. It has 3 parts:

1. A resistor string- In DACs, a set of equal resistors are used to provide a voltage divider network
As mentioned in the paper, each resistor was taken to be around 1811 ohms. Instead of mosfet based resistors, I used resistor elements directly.

2. Control Singals Generator Block- This block is used to pass the digital inputs to the MUX for use as select lines.
To design the block, I created transmission gate, CMOS inverter and DFF sub circuits. I connected them as in the paper

3. 8:1 MUX: the 8:1 mux takes the resistor string intermediate voltages as inputs and control signals generator block ouputs as select
 lines. The 8:1 MUX was made using 7 units of 2:1 muxes as subcircuits. 2:1 MUX was made directy from transmission gate type design using mosfets.

The 3 blocks were connected appropriately and digital inputs were varied to obtain analog output.
The final op-amp buffer stage was ommited as it did not provide any amplification (Vout=Vin) and the current mirrors within the buffer had
sizing issues.



