Questions tagged [low-noise-amplifier]

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Choice of passive components for AD549/AD630 low-noise circuit?

I'm trying to reproduce an "ultra" low-noise amplifier circuit which calls for several precision amplifiers/modulators (AD549/LF356/AD630). The input source is a Hamamatsu S1223 photodiode capturing a ...
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44 views

Building a “if” statement circuit where i can control different light diodes

I want to design a circuit to react in different ways depending if a microphone picks up one frequency and in different way if it picks up the some other frequency. I want different lights to shine ...
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51 views

What are the qualities that you look for in a 2nd stage LNA?

We are building a multi-stage LNA for a TR module we are building in the 144MHz and 440MHz range. The 1st stage LNA has to be the most sensitive---but what is important to consider when choosing a 2nd ...
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32 views

How would you filter the DC input suitable for use to bias/power an LNA?

We are building a transmit/receive module for the 144MHz and 440MHz bands. As I understand, a good LNA can provide poor performance if the environment or the bias voltage is too noisy. What are the ...
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24 views

Additional gain with in-amp for nanovolt-scale pre-amp

Currently I'm designing a pre-amp for detecting nanovolt-scale(~100nV, <1kHz) signal for experiment. I need a final gain to be around ~100000. Since the magnitude of the signal is extremely small, ...
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30 views

Photodetector and low noise amplifier acting as low pass filter

I need some basic advice for impedance matching: I have a photodetector (Det01CFC from Thorlabs, https://www.thorlabs.com/drawings/275cb418cdc2cf1f-A2E46103-D9C0-3581-4553E3D3CA93AD83/DET01CFC-Manual....
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90 views

12-15V to 9V power supply required to power audio equipment

I have a 12-0-12 transformer with output after filtering 15-16V. It's for audio equipment uses. I want to power a guitar pedal with 9V. I tried L7809 but it's making a whistling noise, so I tried ...
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1answer
45 views

Can a Unilateral Amplifier be Unstable?

When designing microwave amplifiers, stability is an important factor to consider. Stability is usually measured with the K factor. In a unilateral network, S_12 = 0, and this makes the K factor ...
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280 views

LNA using Common Emitter with feedback collector

I am trying to design an LNA with input impedance of 50 Ohms, I am considering the topology illustrated below. I have found an online calculator that computes this however when I try to work out the ...
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45 views

Need help understanding a fairly vague solution to example problem (the topic is noise in CMOS circuits)

So I have the solution to the following example problem I am working on: Now the issue is that I am trying to understand the solution I was given: The thing is this solution is simply quite vague. ...
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2answers
119 views

How could I build an amplifier circuit that can take an input voltage of 0-0.7V and amplify to 0-32V, 1 ampere, that works for 100 MHz?

A little background first. I am trying to build a pretty dumb project where I try to take a VGA input and display it in a manner similar to a Nipkow disk. The high frequency RGB signals need to be ...