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The manufacturers' data sheets do a good job of explaining it. (I assume you're talking about a chopper amplifier) Basically, the inputs are shorted, and a capacitor is charged to the value of residual offset voltage; then the inputs are connected to the signal and the offset value on the capacitor is subtracted from that.
I have come across an RF millivoltmeter that used a proper mechanical chopper - like a sealed relay that buzzed all the time. Basically the RF was applied to a special diode that produced pico-amps of current at millivolts. The chopper then switched this DC on and off which produced AC which was amplified with a high gain AC amplifier. Its output was then rectified and fed the meter.
Frank
Honestly speaking, although the other contributor where able to imagine a possible meaning of the original question, I'm not yet sure, to which kind of "chopper" the question refers, particularly because it's posted in the RF forum. How about starting a thread with a clear question?
Honestly speaking, although the other contributor where able to imagine a possible meaning of the original question, I'm not yet sure, to which kind of "chopper" the question refers, particularly because it's posted in the RF forum. How about starting a thread with a clear question?
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