US 12,316,281 B2
Reception circuit for optical communication
Yoshiyuki Sugimoto, Osaka (JP); and Keiji Tanaka, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Filed on Sep. 16, 2022, as Appl. No. 17/932,743.
Claims priority of application No. 2021-153448 (JP), filed on Sep. 21, 2021; and application No. 2021-153449 (JP), filed on Sep. 21, 2021.
Prior Publication US 2023/0092750 A1, Mar. 23, 2023
Int. Cl. H03F 3/08 (2006.01); H03F 1/08 (2006.01); H03F 3/45 (2006.01); H03G 3/30 (2006.01); H04B 10/60 (2013.01)
CPC H03F 1/083 (2013.01) [H03F 3/45179 (2013.01); H03F 3/45973 (2013.01); H03G 3/3084 (2013.01); H04B 10/60 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A reception circuit comprising:
an input terminal configured to receive an input current;
a voltage signal circuit having an input node, the voltage signal circuit being configured to convert a current signal into a voltage signal, the current signal being input to the input node, and the input node being coupled to the input terminal;
a reference voltage circuit configured to generate a reference voltage in accordance with a first feedback current;
a differential amplifier circuit configured to generate a differential signal in accordance with a voltage difference between the voltage signal and the reference voltage; and
an offset control circuit including a first current mirror circuit and a second current mirror circuit, the offset control circuit being configured to generate the first feedback current flowing out from the first current mirror circuit connected to a power supply line and a second feedback current flowing into the second current mirror circuit connected to a ground, adjust the first feedback current such that an offset of the differential signal falls within a tolerance and disable the second feedback current when the voltage signal has an average voltage value greater than the reference voltage, and alternatively disable the first feedback current and subtract the second feedback current from the input current such that the offset of the differential signal falls within the tolerance when the voltage signal has an average voltage value smaller than the reference voltage.