Datasheet > QA605

QA605

更新时间： 2024-01-20 18:35:22

品牌	Logo	应用领域
其他 - ETC		放大器
页数	文件大小	规格书
2页	61K
描述
Low Noise Preamplifier

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QA605 数据手册

QA 605

Low Noise Preamplifier

Rev. 1.1

Shortform Datasheet

Features:

• Low Noise Preamplifier

• For 200Ω…5kΩ Source

Impedance Range

• Low 1/f Corner Frequency

• Low Quiescent Current

• High Speed

• No External Components

Required

• Hermetically Sealed Metal

Package (DIL-14)

Production to MIL-Standards

(MIL-PRF-38534 / MIL-STD 883C/D/E )

available on request.

Applications:

Sonar, Instrumentation, Sensor

Frontend

Circuit Description:

Low noise monolithic circuits generally have quite high current noise densities, rendering

them unsuitable for source impedances (real value) of over 250Ω, not to mention

impedances of 1kΩ or higher. Bias current of the input differential pair in a low noise amplifier

has to be relatively high to reduce input noise voltage density. In the case of a bipolar input

stage, this would cause the input bias current to rise beyond acceptable levels. Therefore

designers often provided the input stage with current sources - which make the input current

noise density even worse and may cause instabilities for higher source impedances.

This hybrid design shows none of the above mentioned drawbacks: Current noise density is

low even with excellent voltage noise density, the amplifier has low input bias current and will

not become unstable for high source impedances.

The circuit topology is internally differential, but with single ended input and output. There are

generally no external components required to run the amplifier, supply bypass capacitors are

integrated. However, if you intend to run the amplifier with high output load, additional bypass

capacitors (tantalum) are recommended. The amplifier fits into DIL-14 sockets and features a

hermetically closed (welded) metal package which provides RFI-protection and high reliability

even under difficult environmental conditons.

The amplifier is recommended for ultrasonic signal conditioning, especially for transducer

impedances in the 1kΩ range and frequencies up to 1.5MHz. By its outstanding DC input

characteristics the amplifier also qualifies for low noise instrumentation or sensor

applications.

Quintenz Hybridtechnik • www.quintenz.de • Fax 0049-89-759 25 45

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