US 12,009,847 B2
Split input amplifier for protection from DC offset
Hongrui Wang, San Jose, CA (US); Abbas Komijani, Mountain View, CA (US); and Xinhua Chen, San Diego, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 21, 2022, as Appl. No. 17/950,053.
Application 17/950,053 is a continuation of application No. 17/690,867, filed on Mar. 9, 2022, granted, now 11,894,866.
Prior Publication US 2023/0291422 A1, Sep. 14, 2023
Int. Cl. H04B 1/04 (2006.01)
CPC H04B 1/04 (2013.01) [H04B 2001/0408 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device, comprising:
a receiver configured to generate a reference voltage signal;
a transmitter coupled to the receiver, the transmitter comprising:
a differential amplifier configured to receive the reference voltage signal via the receiver and a varying power supply; and
offset tracking circuitry coupled to the differential amplifier, the offset tracking circuitry configured to compensate for a direct current voltage offset based at least partially on a comparison of the reference voltage signal and the varying power supply.