| 摘要 |
PURPOSE:To obtain a peak or bottom level detector in which a peak level or a bottom level of an input signal is detected at a high speed and a detected output is kept for a long time. CONSTITUTION:A 1st peak detection circuit A detects a peak level at a high speed and the storage time of the charge stored in a capacitor CA is short. A 2nd peak detection circuit B has a somewhat slow operating speed and the storage time of the charge stored in a capacitor CB is long. The arithmetic operation circuit C takes the sum of detection outputs of the circuits A, B. Furthermore, a very small current source circuit D extracts very small currents from the capacitors CA, CB and a discharge time constant of the charge stored in the capacitors CA, CB is controlled. A peak level or a bottom level outputted from the arithmetic operation circuit C are provided as an output at a high speed by the circuit A and kept for a long time by the circuits B, D. |
