US 12,334,879 B2
Amplification device for amplifying a signal in electro-optical transceivers
Antonio Musio, Segrate (IT); and Luca Piazzon, Segrate (IT)
Assigned to Huawei Technologies Co., Ltd., Shenzhen (CN)
Filed by HUAWEI TECHNOLOGIES CO., LTD., Guangdong (CN)
Filed on Mar. 8, 2022, as Appl. No. 17/689,444.
Application 17/689,444 is a continuation of application No. PCT/EP2019/074094, filed on Sep. 10, 2019.
Prior Publication US 2022/0190791 A1, Jun. 16, 2022
Int. Cl. H03F 3/08 (2006.01); H03F 3/16 (2006.01); H04B 10/60 (2013.01)
CPC H03F 3/08 (2013.01) [H03F 3/16 (2013.01); H04B 10/60 (2013.01); H03F 2200/165 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplification device configured for amplifying a signal, the amplification device comprising:
a coupling filter circuit having an input terminal for receiving an input signal and an output terminal for outputting a filtered output signal, wherein the coupling filter circuit is configured to at least attenuate a DC signal component of the input signal to obtain the filtered output signal, wherein the coupling filter circuit comprises
a first capacitor circuit connecting the input terminal to the output terminal, the first capacitor circuit comprising a first capacitor;
a second capacitor circuit connected in parallel to the first capacitor circuit, the second capacitor circuit comprising a second capacitor, a first resistor and a second resistor, the second capacitor, the first resistor and the second resistor being serially connected; and
a resistor circuit connected to the input terminal and the output terminal, the resistor circuit comprising a third resistor connected to the input terminal and a fourth resistor connected to the output terminal;
an amplification circuit connected to the output terminal, the amplification circuit being configured to amplify the filtered output signal to obtain an amplified filtered signal; and
a further coupling filter circuit, wherein the further coupling filter circuit comprises a further input terminal for receiving an inverted version of the input signal and a further output terminal for outputting a further filtered output signal, and wherein the coupling filter circuit has an electrical bandpass characteristic.