A High Dynamic Range Transimpedance Amplifier with Three Controlled Current Branches
A technology of transimpedance amplifier and high dynamic range, which is applied in the direction of light-controlled amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers with field effect devices, etc., which can solve the problems of limited gain adjustment range and achieve increased The effect of dynamic range
Active Publication Date: 2020-11-17
HUAZHONG UNIV OF SCI & TECH
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[0008] Aiming at the defects of the prior art, the purpose of the present invention is to provide a transimpedance amplifier with a high dynamic range, aiming to solve the problem of limited gain adjustment range in the prior art due to the constraints of zero-pole stability and DC operating point stability. The problem
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] The invention provides a high dynamic range transimpedance amplifier, which provides support for a large dynamic range while ensuring the stability of the amplifier by introducing an extra bypass current branch structure controlled by an automatic gain control circuit. At the same time, the dynamic range enhancement structure does not introduce large noise and has almost no impact on sensitivity.
[0029] Figure 5 It shows a structural block diagram of a high dynamic range transimpedance amplifier proposed by the present invention. The transimpedance amplifier includes: an operational ampl...
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The invention discloses a high-dynamic-range trans-impedance amplifier with three controlled current branches. The high-dynamic-range trans-impedance amplifier comprises an operational amplifier and the three controlled current branches. Wherein the first controllable current branch is arranged between the input end of the operational amplifier and an external input power supply, the second controllable current branch is arranged in the operational amplifier, and the third controllable current branch is arranged between the output end and the input end of the operational amplifier; the dynamicrange of the trans-impedance amplifier is widened through the combined action of the three controllable current branches, and a direct-current working point is stabilized. Due to the fact that an extra current branch is introduced outside the feedback loop, gain adjustment almost has no influence on zero-pole stability, and the dynamic range is enlarged. Meanwhile, the three controlled current branches are dynamically adjusted along with the input current intensity, and it is guaranteed that stable working points exist in the whole dynamic range.
Description
technical field [0001] The invention belongs to the technical field of transimpedance amplifiers, and more particularly relates to a transimpedance amplifier with a high dynamic range. Background technique [0002] Optical fiber communication plays a vital role in high-speed information transmission network. As an important part of the optical receiver, the transimpedance amplifier determines the receiver's sensitivity, input dynamic range and other important indicators. In recent years, the continuous improvement of the demand for high-capacity short-distance communication has made the passive opto-electronic network (PON) an ideal solution for high-speed and low-cost. In the PON network, in order to meet the requirements of different transmission distances, the transimpedance amplifier needs to have high dynamic range and high sensitivity at the same time. [0003] figure 1 It is a block diagram of the front-end system of a conventional variable-gain photoelectric recei...
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IPC IPC(8): H03F1/42H03F3/16H03F3/10H03F3/08
CPCH03F1/42H03F3/082H03F3/10H03F3/16
Inventor 毕晓君
Owner HUAZHONG UNIV OF SCI & TECH