| 摘要 |
A peak detector capable of rapidly detecting a peak value of a signal is provided. The peak detector includes first and second operational amplifiers and an auxiliary current source to detect two rail to rail signals. The first operational amplifier outputs a detection signal by buffering a first rail to rail input signal. The second operational amplifier outputs a control signal in response to a second rail to rail input signal and the detection signal. The auxiliary current source includes a terminal connected to an output terminal of the first operational amplifier and the other terminal connected to the first or second source voltage. The auxiliary current source operates in response to the control signal. The auxiliary current source supplies a current from the first source voltage to the output terminal in response to the control signal or supplies a path for discharging a current from the output terminal to the second source voltage.
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