US 12,113,499 B2
Wideband current-mode low-pass filter circuits
Peter Gazzerro, San Diego, CA (US); Nitz Saputra, Burlingame, CA (US); Ashok Swaminathan, Cardiff, CA (US); Osama Elhadidy, San Diego, CA (US); and Bo Yang, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Dec. 20, 2022, as Appl. No. 18/068,837.
Prior Publication US 2024/0204753 A1, Jun. 20, 2024
Int. Cl. H03H 11/04 (2006.01); H03M 1/06 (2006.01); H03M 1/66 (2006.01); H04B 1/04 (2006.01)
CPC H03H 11/0461 (2013.01) [H03M 1/0626 (2013.01); H03M 1/66 (2013.01); H04B 1/04 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A filter circuit comprising:
an input node;
an output node;
a power supply node;
a first transistor comprising a drain coupled to the input node;
a second transistor comprising a drain coupled to the output node and comprising a gate coupled to a gate of the first transistor;
a capacitive element coupled between the drain of the first transistor and the power supply node;
a first resistive element coupled between the drain and the gate of the first transistor;
a first source degeneration element coupled between a source of the first transistor and the power supply node;
a second source degeneration element coupled between a source of the second transistor and the power supply node;
a switch coupled between the input node and the drain of the first transistor;
a switch driver; and
a second resistive element coupled between a control input of the switch and an output of the switch driver.