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Trans-impedance amplifier circuit

A technology of transimpedance amplifiers and amplifiers, applied in amplifiers, differential amplifiers, amplifiers controlled by light, etc., can solve the problems of noise reduction performance, circuit complexity, power supply voltage increase, etc., and achieve low circuit complexity, low common mode gain, Effect of Low Supply Voltage

Pending Publication Date: 2019-12-06
シコヤゲーエムベーハー
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of the known circuit of the transimpedance amplifier is that an additional amplifier (transistor and current source transistor) is required at its input, making the circuit more complex and degrading the noise performance
An additional disadvantage is that the additional amplifier at the input makes at least two collector-emitter voltages (especially the collector-emitter voltage of the current source transistor and the collector-emitter voltage of the transistor in the common base circuit ) required to include an increase in the supply voltage to the operating point voltage of the diode

Method used

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  • Trans-impedance amplifier circuit
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Examples

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Embodiment Construction

[0018] according to figure 1 , the circuit according to the invention comprises a transimpedance amplifier 20 having a first amplifier part 30 and a second amplifier part 31 . The first amplifier part 30 and the second amplifier part 31 are connected to a common supply voltage 9 . In order to set the operating point, the first amplifier part 30 and the second amplifier part 31 are each connected to the same or common current source 11 . Circuit 20 is configured as a transimpedance amplifier.

[0019] The first amplifier part 30 has a first input voltage U in+ is applied to the as well as the first input current I in+ into the first input terminal 32 . Furthermore, the first amplifier part 30 has a first output connection 33 at which an output voltage U vo- .

[0020] The second amplifier part 31 has a second input voltage U in- is applied to the as well as the second input current I in- into the second input terminal 34 . Furthermore, the second amplifier part 31 has ...

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PUM

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Abstract

The invention relates to a circuit containing a trans-impedance amplifier for converting two input currents into two output voltages, having a first amplifier part containing a first input, to which afirst input voltage is applied, and into which a first input current flows, and having a second amplifier part containing a second input, to which a second input voltage is applied and into which a second input current flows, wherein the first amplifier part and the second amplifier part are connected to a common supply voltage, the first amplifier part and the second amplifier part are connectedto a common current source, the input of the first amplifier part and the input of the second amplifier part have a differing direct voltage, and the first amplifier part and the second amplifier part are designed such that an output voltage of the first amplifier part is proportional to the input current of the first amplifier part and an output voltage of the second amplifier part is proportional to an input current of the second amplifier part.

Description

technical field [0001] The invention relates to a circuit comprising a transimpedance amplifier for converting two input currents into two output voltages, said circuit comprising a first input to which a first input voltage is applied and to which a first input current flows. A first amplifier component, and including a second amplifier component including a second input to which a second input voltage is applied and into which a second input current flows. Background technique [0002] Transimpedance amplifiers are used in particular to convert an input current signal into an output voltage signal. The input current signal may eg be the current of a photodiode. The transimpedance amplifier receives the current signal output by the photodiode, converts the current signal into a corresponding voltage signal, and outputs the voltage signal. The voltage signal can optionally be amplified by means of an amplifier. [0003] US 5 345 073 A discloses a circuit comprising a tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F1/30H03F1/32H03F3/45H03F1/42H03F3/08
CPCH03F1/26H03F1/302H03F1/3211H03F1/42H03F3/08H03F3/45076H03F3/45085H03F2200/372H03F2200/462H03F2203/45116H03F2203/45154G01J1/44G01J2001/446H03F1/083H03F2200/129H03F2200/228
Inventor 约翰·克里斯托弗·斯谢特谢尔吉·古德里耶夫
Owner シコヤゲーエムベーハー
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