US 12,395,126 B2
Methods and circuitry for reducing mixer harmonics conversion gain and local oscillator fundamental and harmonics feedthrough
Omar E Elaasar, San Diego, CA (US); Shan He, Austin, TX (US); Gang Zhang, Austin, TX (US); and Anandaroop Chakrabarti, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jun. 16, 2023, as Appl. No. 18/336,786.
Prior Publication US 2024/0421769 A1, Dec. 19, 2024
Int. Cl. H03D 7/14 (2006.01); H03M 1/66 (2006.01); H03M 1/68 (2006.01)
CPC H03D 7/1466 (2013.01) [H03D 7/1441 (2013.01); H03D 7/1491 (2013.01); H03D 2200/0052 (2013.01); H03D 2200/0086 (2013.01); H03M 1/66 (2013.01); H03M 1/685 (2013.01)] 20 Claims
OG exemplary drawing
 
1. Mixer circuitry comprising:
a first mixer transistor configured to receive a first oscillating signal and coupled to a first tail node;
a second mixer transistor configured to receive a second oscillating signal and coupled to the first tail node;
a first digital-to-analog converter (DAC); and
a second digital-to-analog converter (DAC) coupled between the first DAC and the first mixer transistor.