US 11,923,861 B1
Wideband rail-to-rail voltage controlled oscillator
Hao Liu, San Diego, CA (US); Lejie Lu, San Diego, CA (US); Yu Song, San Diego, CA (US); and Dong Ren, San Diego, CA (US)
Assigned to QUALCOMM INCORPORATED, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 3, 2023, as Appl. No. 18/164,211.
Int. Cl. H03L 7/099 (2006.01); H03L 7/089 (2006.01); H03L 7/091 (2006.01)
CPC H03L 7/0995 (2013.01) [H03L 7/0891 (2013.01); H03L 7/091 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a first upper voltage rail;
a first lower voltage rail; and
a voltage controlled oscillator (VCO), comprising:
at least one second upper voltage rail;
at least one second lower voltage rail;
a ring oscillator (RO) including a set of N cascaded inverters arranged in a ring, wherein the set of N cascaded inverters are coupled between the at least one second upper voltage rail and the at least one second lower voltage rail, wherein N is a positive integer number;
at least one first frequency band select circuit coupled between the first upper voltage rail and the at least one second upper voltage rail, respectively;
at least one second frequency band select circuit coupled between the at least one second lower voltage rail and the first lower voltage rail, respectively;
at least one first VCO frequency control circuit coupled between the first upper voltage rail and the at least one second upper voltage rail, respectively; and
at least one second VCO frequency control circuit coupled between the at least one second lower voltage rail and the first lower voltage rail, respectively.