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Class C amps saturating?

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July 12th 06, 02:58 PM posted to rec.radio.amateur.homebrew

Tim Shoppa Tim Shoppa is offline

Tim Shoppa is offline

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First recorded activity by RadioBanter: Jul 2006

Posts: 263

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Class C amps saturating?

wrote:
I'm reading David Rutledge's excellent "The Electronics of Radio."

In Chapter 10 -- Power Amplifiers, he discusses Class C amps and says,
"In addition, if we drive the transistor clear to saturation, using the
transistor as a switch, the dissipated power can be greatly reduced,
because the saturation voltage is low. This is Class C
amplification..."

I'd always throught that in Class C, while you'd operate the device so
that it was cutoff during most of the cycle, but not saturated.

Is this just a different definition of Class C?

I checked back with SSDRA and EMRFD, and didn't see anything about
driving Class C amps into saturation?

What says the group? Do we saturate in Class C or not?

Saturation is itself a somewhat mushy point. There's a V_sat specified
on the datasheets but the actual definition of saturated is entirely
application-sensitive. As a practical matter as you add more base
current you will go further into saturation (up until you melt the
base-emitter junction and then all sorts of wacky things ensue).

Choice of drive level and output level and load impedance in a Class C
amplifier certainly will in many cases put the device into saturation.

Tim.

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