Inventors:
Varadarajan Devnath - Santa Clara CA, US
Jitendra Mohan - Santa Clara CA, US
Quyet Nguyen - San Jose CA, US
Yongseon Koh - Palo Alto CA, US
Assignee:
National Semiconductor Corporation - Santa Clara CA
International Classification:
H03B005/08
H03B005/12
US Classification:
331 46, 331 48, 331 55, 331108 B, 331117 R, 331117 FE, 331172, 331177 V
Abstract:
A circuit and method for generating quadrature signals with a deterministic phase relationship. Between two inductive-capacitive (LC) based quadrature voltage controlled oscillators (VCO), phase shift circuitry is interposed such that the individual LC VCO circuits produce signals with corresponding phase delays which ensure that the desired lead or lag phase relationship between the quadrature signals is achieved.
