Session 7-1
A 5th-order Delta-Sigma Modulator with Single-Opamp Resonator
Abstract
| A new circuit configuration realizing 2nd-order resonator with one opamp is applied to a 5th-order deltasigma modulator. The proposed resonator enables us to any kinds of 2nd-order transfer function, which means that the resonator can realize a single feedback modulator with feed forward compensation. Collaborating with other two improved features of a kickback relaxation filter and a simple resistor adder, we fabricated the highly efficient 5th-order delta-sigma modulator with only three opamps, whose FOM was 0.24 pJ/conv. |