Download **** 1 - Indico

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts
no text concepts found
Transcript
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
Related documents