| 摘要 |
A chopper stabilized operational amplifier implemented on a single integrated circuit chip is disclosed. The disclosure includes a symmetrical random signal generator circuit that produces a true random voltage signal upon application of a DC bias current. The true random voltage signal is obtained by amplifying and bandpass filtering random white noise voltages generated by a component on the chip. The random signal generator circuit is employed with a symmetrical oscillator to form a random clock signal generator on the same chip. The amount of time between each clocking pulse output by the random clock signal generator randomly varies within a selected range of time. The random clock signal generator is used to control the amount of time between each switching of a chopper switch in the chopper-stabilized operational amplifier, so that the chopping frequency is truly random. The random signal generator and the random clock signal generator do not create digital noise on a power supply because, for each current or voltage that turns on in those circuits, an equal current or voltage turns off.
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