US 9,813,034 B2
Amplification circuit and method of compensating for voltage offset of inputs
Yongxu Wang, Shanghai (CN); Wenrong Qian, Shanghai (CN); Kapil Jain, Santa Clara, CA (US); Song Chen, Shanghai (CN); and Xiaoxiao Zhao, Shanghai (CN)
Assigned to Marvell World Trade Ltd., St. Michael (BB)
Filed by MARVELL WORLD TRADE LTD, St. Michael (BB)
Filed on Jul. 7, 2016, as Appl. No. 15/204,040.
Claims priority of provisional application 62/189,479, filed on Jul. 7, 2015.
Claims priority of provisional application 62/233,553, filed on Sep. 28, 2015.
Prior Publication US 2017/0012589 A1, Jan. 12, 2017
Int. Cl. H04R 29/00 (2006.01); H03G 1/00 (2006.01); H03F 3/45 (2006.01); H04R 3/10 (2006.01)
CPC H03G 1/0035 (2013.01) [H03F 3/45475 (2013.01); H03F 3/45973 (2013.01); H04R 3/10 (2013.01); H03F 2200/78 (2013.01); H03F 2203/45212 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An amplification circuit, comprising:
an amplifier configured to amplify first and second input electrical signals, the amplifier including:
first and second input nodes configured to receive the first and second input electrical signals; and
first and second output nodes configured to output first and second output electrical signals having amplified voltages relative to the first and second input electrical signals;
a direct current (DC) voltage difference detector configured to generate a detection result indicating a DC voltage difference between the first and second output electrical signals;
a first variable resistive device electrically coupled to the second input node of the amplifier, the first variable resistive device being configured to have a resistance value to compensate for a DC voltage difference between the first and second input electrical signals, based on the DC voltage difference between first and second output electrical signals that are output from the first and second output nodes of the amplifier; and
a controller configured to determine a set of settings, for setting the resistance value of the first variable resistive device, based on the detection result when the amplification circuit is in a calibration mode.