Patent ID: 9673797
Date: 2017-06-06
CPC Classifications: G01R,H03F,H03G,H03K

Claim:
1. A peak detector using a charge pump, comprising: a differential amplifier configured to receive an input signal to be detected through an input node and amplify the received signal; a current control logic configured to create two or more current control signals by comparing a signal output from the differential amplifier with two or more reference voltages; a mirror current source portion comprising two or more mirror current sources configured to be driven respectively by the current control signals from the current control logic; a capacitor configured to be charged or discharged by currents output from the mirror current sources; and a reset circuit configured to reset a voltage of the capacitor; and a replica amplifier configured to be the same as the differential amplifier, the replica amplifier including two differential input nodes connected with a same input signal as that input to the differential amplifier and providing a reference voltage to be applied to the current control logic, wherein the reference voltage is insensitive to changes in process and associated with a state of the input signal.