Introduction So, we want to break down our continuous-time sigma-delta feedback into two paths: A low-precision tight loop that delivers the first sample to the quantizer A higher-precision loop that goes through a clock delay to minimize “metastability” (indecision)

# Tag Archives: feedback

## A compact common-mode feedback loop | using a PMOS triode device for CMFB

One of the defining traits of analog CMOS designers is the ability to implement a common-mode feedback (CMFB) loop. When the input devices on a differential pair are all NMOS (or NPN), and the loads are either inductors or resistors, a common-mode feedback loop is unnecessary, because the output resistance of the differential pair is […]

Posted in Analog Professional
Also tagged bias, CMOS, common mode, continuous time, load, loop, opamp, OTA, stability
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## Example Simulink model & scripts for continuous-time sigma-delta ADC

I’ve put together a 2nd order continuous sigma-delta Simulink model as a starting point. This is the multi-port feedback configuration (feeds back into input of 1st and 2nd integrators).

Posted in Analog Professional
Also tagged ADC, continuous time sigma-delta, example, matlab, quantizer, sigma delta, simulink
19 Responses