Low-Noise Amplifier Design and Analysis

This show is part of an on-going series from National Semiconductor. The seriesis called "Analog by Design Show - Hosted by Bob Pease". This is show 10. The Analog by Design Show - Hosted by Bob Pease is aimed at analog and digital integrated circuit designers and engineers. Various technologies from National Semiconductor and their partners are usefully described in an educational and entertaining atmosphere.

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Science & Technology

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• Webench
• Chips
• Integrated
• Circuits
• Bob
• Pease
• Analog
• Design
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• national.com/nationaltv

[Georgi4CHRIST]

@zapotar Like they said they look at the cases where you've got two-staged amplifiers -- one with a high gain and another with a low gain for "fine tuning" the signal. And since the signal often needs to be filtered as well the second stage of the amplifier can also serve as a filter.

[zapotar]

expected to see a low noise amplifier design, but the video was more about filter design. I don't understand how they relate

[112smosquito]

Multisim is cute, but it's for amateurs.

[woodsbike]

ummm - generally speaking - "poles" and "zeroes" are a shorthand way of describing the transfer function of a filter or system. More poles generally means a sharper slope (you know, dB/octave) beyond cutoff (for a low-pass filter). The location of the poles/zeroes on the complex plane determines the "Q" or bandwidth for something like a bandpass filter. If you think the electronics is bad, wait'll you dive into the math!

[jimbobg65]

What I would like to understand is: What are poles? Do 'poles' make bandwidth more narrow or broad depending on how many there are? I understand from using audio equipment in my line of work (audio mixing) that more poles generally means a more narrow bandwidth, but it's difficult to get round the electronics and how it actually works.