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CMOS Peak Detector using Diode Connected MOSFET An active type peak detector using OP-amp and transistor has high performance, however active type is too complicate structure which control and suppress the errors. Actually many of active type peak detectors employee complicate error compensation circuit. VDD ENC CC Ci Switching Time Controller Vin Qch Voff C gd Cd Ch < Active Type Simple Peak Detector and Error Sources > < Example of Complicated Structure of Peak Detector > Input error sources : Parasitic capacitance Input parasitic capacitance Coupling capacitance MOSFET error sources Gate-to-drain capacitance Drain capacitance Channel charge Qch Offset error calibrated using multiple switches Additional control circuits and power consumption Another error or problem generated by additional circuits Inadequate structure for multi-channel system CMOS Peak Detector using Diode Connected MOSFET In a communication system, sometimes an input signal need to be rectified in order to use as the system power. General rectifying circuit uses diodes, however, we cannot use a diode due to its forward voltage drop which cause input signal loss. We suggest passive peak detector using diode connected MOSFET which has advantages of diode peak detector and also has active peak detector. Our peak circuit shows only 1.2 % loss when the amplitude of input is 1 V. On the other hands, diode peak detector has almost 50 % loss at the same condition. 1.5 1.0 Diode Output Input Signal 1.0 0.5 Amplitude [ V ] Amplitude [ V ] 1.5 Input Signal Output of Proposed Circuit 0.0 -0.5 0.5 0.0 -0.5 -1.0 -1.0 -1.5 -1.5 0.0 1.0x10 -7 Time [s] 2.0x10 -7 3.0x10 -7 0.0 1.0x10 -7 2.0x10 -7 3.0x10 Time [s] -7 4.0x10 -7 5.0x10 -7