Differential Amplifier and Laser Driver Circuit
A differential amplifier circuit and differential amplifier technology, which is applied in the direction of differential amplifiers, amplifiers, lasers, etc., can solve the problem of low precision of MOS resistance control and achieve the effect of ensuring linearity
Active Publication Date: 2021-11-16
深圳市芯波微电子有限公司
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Problems solved by technology
[0005] Based on this, the present application provides a driving circuit for a differential amplifier and a laser to solve the problem in the prior art that the control accuracy of the MOS resistance in the differential amplifier is not high
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[0048] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.
[0050] It can be understood that the terms "first", "second" and the like used in this application may be u...
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The application provides a driving circuit for a differential amplifier and a laser, wherein the differential amplifier includes a differential circuit and a control circuit, the current output terminal of the differential pair tube in the differential circuit is connected with a MOS resistor as a degeneration resistor, and the control circuit is based on the size of the tail current and the magnitude of the output current of the first transistor in the differential pair to generate a gate voltage for controlling the resistance of the MOS resistor, and the gate voltage can be adjusted adaptively with changes in the tail current and the output current of the first transistor , the resistance value of the MOS resistor in the MOS resistor unit can be precisely adjusted, and the relationship between the output current of the differential amplifier and the tail current can be accurately controlled under different tail current conditions and different input voltage conditions as the preset relationship, To ensure the linearity of the output current.
Description
technical field [0001] The invention relates to the technical field of amplifier circuit design, in particular to a differential amplifier and a laser drive circuit. Background technique [0002] The driving circuit of the laser is generally composed of a differential amplifier, through which the input differential signal is amplified and output to provide a driving voltage for the laser. For the triode differential circuit amplifier, increasing its input voltage range will affect the linearity of the output current, but in many application scenarios, the differential amplifier is required to have a larger input voltage range. In order to increase the input voltage range without affecting the linearity of the output current, a resistor can be used in series with the emitter of the input differential pair transistor, which is called a degeneration resistor. The size of the degeneration resistance not only affects the linearity of the output current of the differential amplif...
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IPC IPC(8): H03F3/45H01S5/042
CPCH03F3/4508H01S5/042H03F2203/45542
Inventor 刘辉李创伟陈涛
Owner 深圳市芯波微电子有限公司