Pete M. Campbell, Hans J. Greub, Atul Garg, A. Steidl, Steven R. Carlough, Matthew W. Ernest, Robert F. Philhower, Cliff A. Maier, Russell P. Kraft, John F. McDonald. A very wide bandwidth digital VCO using quadrature frequency multiplication and division implemented in AlGaAs/GaAs HBT s. IEEE Trans. VLSI Syst., 6(1):52-55, 1998. [doi]
Abstract is missing.