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Amplifier circuit, detector device and method for driving an amplifier

An amplifier circuit, amplifier technology, applied in the direction of amplifier, dielectric amplifier, amplifier type, etc.

Active Publication Date: 2015-09-09
AMS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, it is disadvantageous in the presented solution that a noisy signal is applied to the input of the amplifier circuit by
This is just a disadvantage in photodiode applications, since the AC useful signal of said photodiode is usually small relative to the DC signal part and also moves around the noise level of the circuit

Method used

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  • Amplifier circuit, detector device and method for driving an amplifier
  • Amplifier circuit, detector device and method for driving an amplifier

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Embodiment Construction

[0034] figure 1 An amplifier circuit according to the proposed principle is shown. In the measuring path, the amplifier circuit has an amplifier 1 whose first amplifier input 11 and amplifier output 13 are connected by means of a resistor RTIA. The potential agnd is connected to the second amplifier input 12 . The amplifier output 13 is connected to the output OUT of the amplifier circuit. The feedback path of the amplifier circuit comprises a first filter 2 , an auxiliary amplifier 3 , a second filter 4 and a current source 5 . Furthermore, the feedback path connects the output OUT of the amplifier circuit to the first amplifier input 11 .

[0035] Here, in particular, the first filter 2 has first and second resistors R1 , R2 and first and second capacitors C1 , C2 . In this case, the first resistor R1 and the first capacitor C1 form an RC link, wherein the first capacitor C1 is connected at the potential agnd. Furthermore, a first resistor R1 is connected to the output ...

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Abstract

An amplifier circuit comprises a measurement path with an amplifier (1) for providing an output voltage (Vout) depending on a measuring current (Ipd) with a first and a second amplifier input (11, 12), and an amplifier output (13). A return path of the amplifier circuit comprises a first filter (2), an auxiliary amplifier (3) and a second filter (4). In this case, the first filter (2) is designed to filter a DC voltage from the output voltage (Vout) and is connected to the amplifier output (13). The auxiliary amplifier (3) serves to convert an input voltage (Vfil) into an output current (Ifil) and has a first and a second auxiliary amplifier input (31, 32) and an auxiliary amplifier output (33). In this case, the first auxiliary amplifier input (31) is connected to the first filter (2). The second filter (4) is designed to filter noise from the output current (Ifil) and couples the auxiliary amplifier output (33) to the first amplifier input (11).

Description

technical field [0001] The invention relates to an amplifier circuit, a detector arrangement and a method for driving an amplifier. Background technique [0002] Photodiodes are used as sensors in a large number of fields, such as in light barriers, in optical proximity switches and in infrared (IR) remote control. A high light sensitivity of photodiodes is a desirable property here, however, this property also poses problems in several fields of application. Usually, a DC or low-frequency signal component is superimposed on the actual useful signal. Ambient light, such as that produced by incandescent bulbs or fluorescent lamps, then causes the corresponding signal to be superimposed on the useful signal, without carrying any useful information here. However, such superimposed signals increase the demands on further signal processing of the corresponding measuring circuit. For example, such circuits must have a large dynamic signal range. Furthermore, a suitable measuri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/26H03F1/34H03F3/08
CPCH03F3/08H03F1/34H03F1/26H03F11/00
Inventor 马克·尼德伯格温琴佐·李奥纳多
Owner AMS AG
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