A 3.2-GHz second-order delta-sigma modulator implemented in InP HBT technology. - Joseph F. Jensen; Gopal Raghavan; Albert E. Cosand; Robert H. Walden (IEEE J. Solid State Circuits, 1995)

IF-sampling fourth-order bandpass ΔΣ modulator for digital receiver applications. - Albert E. Cosand; Joseph F. Jensen; H. Chris Choe; Charles H. Fields (IEEE J. Solid State Circuits, 2004)