A High-Sensitivity Broadband Optical Receiver Front-End Circuit
A receiver front-end, high-sensitivity technology, applied in electromagnetic receivers, electrical components, electromagnetic wave transmission systems, etc., can solve problems such as difficult to achieve high-sensitivity broadband optical receivers, achieve good application prospects, enhance functions, improve circuits The effect of sensitivity
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Embodiment 1
[0047] A high-sensitivity broadband optical receiver front-end circuit, see figure 1 , the broadband optical receiver front-end circuit includes:
[0048] 1. A bootstrap circuit 11 is added to the input of the transimpedance amplifier 1 to reduce the influence of the detector capacitance on the subsequent circuit;
[0049] 2. A noise elimination circuit 12 is added to the transimpedance amplifier 1 to reduce the noise caused by the change of the power supply current and improve the sensitivity of the circuit;
[0050] 3. The limiting amplifier 2 adopts a Cherry-Hooper structure with negative Miller compensation, which is used to amplify the voltage signal output by the transimpedance amplifier 1 to the voltage level required by the digital processing unit;
[0051]4. The DC offset elimination circuit 3 using differential active Miller capacitors is used to eliminate the influence of DC offset on the circuit;
[0052] 5. In order to achieve output impedance matching and provi...
Embodiment 2
[0055] Combine below Figure 2-Figure 6 , and the specific calculation formula further introduces the scheme in embodiment 1, see the following description for details:
[0056] The embodiment of the invention provides a high-sensitivity broadband optical receiver front-end circuit. The front-end circuit of the receiver fully utilizes the advantages of high-speed and strong driving capability of bipolar circuits of germanium-silicon heterojunction and low power consumption and high integration of CMOS circuits. The schematic diagram of the circuit structure of the optical receiver designed in the embodiment of the present invention is as follows figure 1 shown. The front-end circuit of the optical receiver includes: a transimpedance amplifier 1 with a bootstrap circuit and a noise elimination circuit, a group of three-stage cascaded limiting amplifiers with negative Miller capacitance compensation 2, a DC using differential active Miller capacitance Offset cancellation circ...
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