#### bob_lv

##### Member level 1

**multi bit single loop sigma delta**

used in fractional-N frequency synthesizer

i can't understand the multi-bit quantizer,for a 16-bit modulator,how many bits the feedback is? Is it ture that the MSBs of the last accumulator output is the quantizer output and the feedback is the remaing LSBs?Is the bits number of the feedback the same with the input?

i'm all confused!

who can give me some help?Thaks very much!