Homodyne network analyzer with cascaded digital phase shifters. - Uwe Gaertner; Burkhard Schiek; Olaf Ostwald (Proc. IEEE, 1986)

A highly linear frequency ramp generator based on a fractional divider phase-locked-loop. - Thomas Musch; Ilona Rolfes; Burkhard Schiek (IEEE Trans. Instrum. Meas., 1999)

Measurement of the ramp linearity of extremely linear frequency ramps using a fractional dual loop structure. - Thomas Musch; Burkhard Schiek (IEEE Trans. Instrum. Meas., 2001)

Cryogenic noise parameter measurements of microwave devices. - Ilona Rolfes; Thomas Musch; Burkhard Schiek (IEEE Trans. Instrum. Meas., 2001)

LRR-a self-calibration technique for the calibration of vector network analyzers. - Ilona Rolfes; Burkhard Schiek (IEEE Trans. Instrum. Meas., 2003)

A phase-locked-loop concept for the generation of two RF-signals with a small frequency offset. - Thomas Musch; Michael Gerding; Burkhard Schiek (IEEE Trans. Instrum. Meas., 2005)