Hello list members,
I have need to understand why DC restoration is required in a circuit. Can anyone here recommend a good book that explains DC restoration?
Also if you know of a good book (s) that cover complete circuits such as a system. I have plenty of books that cover the basic op-amp circuits, what I need is a book or two that explains how to put all of the building blocks together for "typical" audio systems.
Thank you,
Randy
I have need to understand why DC restoration is required in a circuit. Can anyone here recommend a good book that explains DC restoration?
Also if you know of a good book (s) that cover complete circuits such as a system. I have plenty of books that cover the basic op-amp circuits, what I need is a book or two that explains how to put all of the building blocks together for "typical" audio systems.
Thank you,
Randy
Hi Randy.
I'm probably just showing my ignorance here, but I have never heard of the term DC restoration. Can you amplify? (sorry
)
As for the book, there may well be one, but I find it very informative just to go through any published schematics and try to work out what all the bits do, and break things down into modules I can understand. Much more fun than reading a dry textbook.
I'm probably just showing my ignorance here, but I have never heard of the term DC restoration. Can you amplify? (sorry
)As for the book, there may well be one, but I find it very informative just to go through any published schematics and try to work out what all the bits do, and break things down into modules I can understand. Much more fun than reading a dry textbook.
Say you take an AC signal with a DC component on it. More precisely for this demonstration, you take 2-Volt P-P sin wave with 1-Volt DC offset so the signal swings from 2-Volts to 0-volts.
If you filtered this signal with an arbitrarily large capacitor, the resulting signal would have no DC component on it, ie a DC blocking cap in the digital world or "input cap" in many amps.
The signal now becomes a bipolar signal and swings from -1V to +1V.
But what if you wanted to restore that DC component, or in other words, level shift it so that it is no longer a bipolar signal. That's what a DC restorer circuit does.
I think they are used mostly in frequency modulated (with fixed amplitude) systems such as a TV or a radio where your input is naturally bipolar but you may only want one rail voltage in your circuit.
Since a DC restorer is going to take an input signal and restore a DC component at half the P-P amplitude if your input signals amplitude varies with time, the DC level of the input signal will also vary. This makes it fairly useless for an audio circuit.
--
Danny
If you filtered this signal with an arbitrarily large capacitor, the resulting signal would have no DC component on it, ie a DC blocking cap in the digital world or "input cap" in many amps.
The signal now becomes a bipolar signal and swings from -1V to +1V.
But what if you wanted to restore that DC component, or in other words, level shift it so that it is no longer a bipolar signal. That's what a DC restorer circuit does.
I think they are used mostly in frequency modulated (with fixed amplitude) systems such as a TV or a radio where your input is naturally bipolar but you may only want one rail voltage in your circuit.
Since a DC restorer is going to take an input signal and restore a DC component at half the P-P amplitude if your input signals amplitude varies with time, the DC level of the input signal will also vary. This makes it fairly useless for an audio circuit.
--
Danny
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