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Sigma Delta DAC...HELP

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nhkch

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I have read through some theory for sigma delta modulator but yet i got no ideal how to realize the circuit in ic design as i only see block diagram. There is an adder and a integrator in the block diagram. Is that using an digital adder and an op-amp configure as an integrator to realize it in circuit? Sorry,i'm a newbee in ic design..Please help... Thanks
 

A Sigma-Delta DAC would have everything in the digital domain that is required to generate a bitstream, followed by some way to convert the bitstream into an analog signal. There are many different ways to do it, though, because the Sigma-Delta principle is quite generic, and will work for analog and digital integrators as well as for discrete-time and continuous-time integrators. This may be why you feel that the block diagram is quite far away from an actual implementation.

Slainte!
hanspi
 
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    nhkch

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hanspi said:
A Sigma-Delta DAC would have everything in the digital domain that is required to generate a bitstream, followed by some way to convert the bitstream into an analog signal. There are many different ways to do it, though, because the Sigma-Delta principle is quite generic, and will work for analog and digital integrators as well as for discrete-time and continuous-time integrators. This may be why you feel that the block diagram is quite far away from an actual implementation.

Slainte!
hanspi
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In sigma-delta dac, the sigma delta modulator is in digital domain. So does this mean that i need to design it using verilog instead of using analog way? Then the DAC part which convert the bit stream to an analog signal is design in analog way?
 

Yes, precisely like this.

Slainte!
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