A 40 GHz modified-Colpitts voltage controlled oscillator with increased tuning range. - Chao Su; Sreenath Thoka; Kee-Chee Tiew; Randall L. Geiger (ISCAS (1), 2003)

Fast-switching adaptive bandwidth frequency synthesizer using a loop filter with switched zero-resistor array. - Sreenath Thoka; Randall L. Geiger (ISCAS (6), 2005)