| 摘要 |
A modified topology for a CTDSM (referred herein as "SCFF") can effectively deal with signal transfer function (STF) peaking, an inherent property of continuous time feedforward delta sigma converters. The SCFF approach involves providing an additional digital-to-analog (DAC) feedback path to the input of the second integrator (incurring an additional DAC in the circuitry, converting the output of the quantizer into an analog signal and feeding the analog signal to the input of the second integrator). Furthermore, the SCFF approach involves providing two feed-ins: a first feed-in to the input of the second integrator and a second feed-in to the input of the third integrator. The first feed-in can be negative. Advantageously, the modified continuous time delta sigma modulator implementing this approach alleviates some of the peaking issues in the signal transfer function while still enjoy low power consumption. |
