| 摘要 |
PROBLEM TO BE SOLVED: To provide the peak detection circuit where low power consumption, a high input impedance a low output impedance and reduction in number of components are realized and that detects a peak level of an input signal even when the level of the input signal is low. SOLUTION: Transistors(TRs) Q1 and Q2 in diode connection connect with each other in series between two current sources I1, I2 of this peak detection circuit and a capacitor C1 (C2) that detects a ±peak of an input signal Vin connects in parallel with the current source I1 (I2). Furthermore, the peak detection circuit is provided with an output level shifter (buffer) consisting of a TR Q3 and a current source 13 and with an output level shifter (buffer) consisting of a TR Q4 and a current source 14. |
