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RF amps: tuned load in Class A?
On Mon, 01 Sep 2003 14:16:51 +0100, Paul Burridge
wrote: Is a tuned load (tank circuit) a viable load for an RF amplifier operating in class A? Or is this type of load only really suitable for class C? Of course you can use a tuned load with class A. But the nice thing about a tuned load is that you don't *have* to use class A to achieve a clean output. Of course, if you are using an amplitude modulated signal, then you will need class A. d _____________________________ http://www.pearce.uk.com |
On Mon, 01 Sep 2003 14:16:51 +0100, Paul Burridge
wrote: Is a tuned load (tank circuit) a viable load for an RF amplifier operating in class A? Or is this type of load only really suitable for class C? Of course you can use a tuned load with class A. But the nice thing about a tuned load is that you don't *have* to use class A to achieve a clean output. Of course, if you are using an amplitude modulated signal, then you will need class A. d _____________________________ http://www.pearce.uk.com |
Don Pearce wrote:
On Mon, 01 Sep 2003 14:16:51 +0100, Paul Burridge wrote: Is a tuned load (tank circuit) a viable load for an RF amplifier operating in class A? Or is this type of load only really suitable for class C? Of course you can use a tuned load with class A. But the nice thing about a tuned load is that you don't *have* to use class A to achieve a clean output. Of course, if you are using an amplitude modulated signal, then you will need class A. That is, if the input signal is already AM, you need a class A or linear amplifier. If the AM is to be done at that stage itself, then its the class c non-linear bit that makes the multiplication modulation work. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. |
Don Pearce wrote:
On Mon, 01 Sep 2003 14:16:51 +0100, Paul Burridge wrote: Is a tuned load (tank circuit) a viable load for an RF amplifier operating in class A? Or is this type of load only really suitable for class C? Of course you can use a tuned load with class A. But the nice thing about a tuned load is that you don't *have* to use class A to achieve a clean output. Of course, if you are using an amplitude modulated signal, then you will need class A. That is, if the input signal is already AM, you need a class A or linear amplifier. If the AM is to be done at that stage itself, then its the class c non-linear bit that makes the multiplication modulation work. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. |
Don Pearce wrote:
On Mon, 1 Sep 2003 16:02:24 +0100, "Kevin Aylward" wrote: Don Pearce wrote: On Mon, 01 Sep 2003 14:16:51 +0100, Paul Burridge wrote: Is a tuned load (tank circuit) a viable load for an RF amplifier operating in class A? Or is this type of load only really suitable for class C? Of course you can use a tuned load with class A. But the nice thing about a tuned load is that you don't *have* to use class A to achieve a clean output. Of course, if you are using an amplitude modulated signal, then you will need class A. That is, if the input signal is already AM, you need a class A or linear amplifier. If the AM is to be done at that stage itself, then its the class c non-linear bit that makes the multiplication modulation work. True - I was considering only the "carrying the signal" case. Anode modulation of a PA is a different matter. Yes, I know you knew, I was just tiding up the description a bit for others. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. |
Don Pearce wrote:
On Mon, 1 Sep 2003 16:02:24 +0100, "Kevin Aylward" wrote: Don Pearce wrote: On Mon, 01 Sep 2003 14:16:51 +0100, Paul Burridge wrote: Is a tuned load (tank circuit) a viable load for an RF amplifier operating in class A? Or is this type of load only really suitable for class C? Of course you can use a tuned load with class A. But the nice thing about a tuned load is that you don't *have* to use class A to achieve a clean output. Of course, if you are using an amplitude modulated signal, then you will need class A. That is, if the input signal is already AM, you need a class A or linear amplifier. If the AM is to be done at that stage itself, then its the class c non-linear bit that makes the multiplication modulation work. True - I was considering only the "carrying the signal" case. Anode modulation of a PA is a different matter. Yes, I know you knew, I was just tiding up the description a bit for others. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. |
"Kevin Aylward" wrote in message ... Don Pearce wrote: snip True - I was considering only the "carrying the signal" case. Anode modulation of a PA is a different matter. Yes, I know you knew, I was just tiding up the description a bit for others. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. But did Don know you knew he knew? Regards Ian ;-) |
"Kevin Aylward" wrote in message ... Don Pearce wrote: snip True - I was considering only the "carrying the signal" case. Anode modulation of a PA is a different matter. Yes, I know you knew, I was just tiding up the description a bit for others. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. But did Don know you knew he knew? Regards Ian ;-) |
On Tue, 2 Sep 2003 09:30:38 +0100, "Ian Buckner"
wrote: "Kevin Aylward" wrote in message ... Don Pearce wrote: snip True - I was considering only the "carrying the signal" case. Anode modulation of a PA is a different matter. Yes, I know you knew, I was just tiding up the description a bit for others. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. But did Don know you knew he knew? Regards Ian ;-) I had a suspicion that he had an inkling that I might have known that he had a fair idea that I may have had a rough idea. d _____________________________ http://www.pearce.uk.com |
On Tue, 2 Sep 2003 09:30:38 +0100, "Ian Buckner"
wrote: "Kevin Aylward" wrote in message ... Don Pearce wrote: snip True - I was considering only the "carrying the signal" case. Anode modulation of a PA is a different matter. Yes, I know you knew, I was just tiding up the description a bit for others. Kevin Aylward http://www.anasoft.co.uk SuperSpice, a very affordable Mixed-Mode Windows Simulator with Schematic Capture, Waveform Display, FFT's and Filter Design. But did Don know you knew he knew? Regards Ian ;-) I had a suspicion that he had an inkling that I might have known that he had a fair idea that I may have had a rough idea. d _____________________________ http://www.pearce.uk.com |
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