A compact sub-1V class AB operational amplifier for low-voltage switched-capacitor circuits

2017 ◽  
Author(s):  
S. Del Cesta ◽  
A. Catania ◽  
P. Bruschi ◽  
M. Piotto
Keyword(s):  
Operational Amplifier ◽  
Low Voltage ◽  
Switched Capacitor ◽  
Class Ab ◽  
Switched Capacitor Circuits

scholarly journals Oscillation-based testing method for detecting switch faults in High-Q SC biquad filters

2015 ◽  
Vol 28 (2) ◽  
pp. 223-236 ◽  
Author(s):  
Miljana Milic ◽  
Vanco Litovski
Keyword(s):  
Operational Amplifier ◽  
Special Problem ◽  
Test Point ◽  
Switched Capacitor ◽  
High Q ◽  
Switched Capacitor Circuits ◽  
Testing Method ◽  
The Right ◽  
Catastrophic Faults

Testing switched capacitor circuits is a challenge due to the diversity of the possible faults. A special problem encountered is the synthesis of the test signal that will control and make the fault-effect observable at the test point. The oscillation based method which was adopted for testing in these proceedings resolves that important issue in its nature. Here we discuss the properties of the method and the conditions to be fulfilled in order to implement it in the right way. To achieve that, we have resolved the problem of synthesis of the positive feed-back circuit and the choice of a proper model of the operational amplifier. In that way, a realistic foundation to the testing process was generated. A second order notch cell was chosen as a case-study. Fault dictionaries were developed related to the catastrophic faults of the switches used within the cell. The results reported here are a continuation of our previous work and are complimentary to some other already published.

scholarly journals Microwatt Switched Capacitor Circuit Design

1982 ◽  
Vol 9 (4) ◽  
pp. 263-273 ◽  
Author(s):  
E. Vittoz
Keyword(s):  
Low Voltage ◽  
Settling Time ◽  
Switched Capacitor ◽  
Mos Transistors ◽  
Weak Inversion ◽  
Switched Capacitor Circuits ◽  
Low Voltage Operation ◽  
Biquadratic Filter ◽  
Cmos Implementation ◽  
Current Drain

The micropower CMOS implementation of the three basic components of switched capacitor circuits is discussed. Switches must be carefully designed to allow low voltage operation and compensation of clock feed-through by dummy transistors. Matched capacitors can be implemented in single polysilicon technologies primarily designed for digital micropower circuits. Excellent micropower amplifiers are realized by using simple one-stage circuits which take advantage of the special behaviour of MOS transistors in weak inversion. Noise is shown to be independent of current level which only influences the settling time. Various ways of improving the settling time while keeping a very low current drain are described. A method of calculating the noise of a biquadratic filter is followed by examples of a filter and of other switched capacitor circuits.

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