Bulk-driven feed-forward compensated sub-threshold low-voltage OTA to drive high capacitive load

2017 ◽  
Author(s):  
Tripurari Sharan ◽  
Vijaya Bhadauria ◽  
Priyanka Chetri
Keyword(s):  
Low Voltage ◽  
Feed Forward ◽  
Capacitive Load

scholarly journals Low-voltage, low-power and high gain cmosota using active positive feedback with feed forward and FDCM techniques

2002 ◽  
Vol 15 (1) ◽  
pp. 93-101
Author(s):  
Lyes Bouzerara ◽  
Tahar Belaroussi ◽  
Boualem Amirouche
Keyword(s):  
Positive Feedback ◽  
Low Voltage ◽  
Supply Voltage ◽  
Phase Margin ◽  
Current Mirror ◽  
Power Supply Voltage ◽  
Gain Bandwidth ◽  
Frequency Dependent ◽  
Feed Forward ◽  
Current Mirrors

A low voltage, high dc gain and wideband load compensated cas code operational transconductance amplifier (OTA), using an active positive feedback with feed forward technique and frequency-dependent current mirrors (FDCM), is presented and analyzed. Such techniques stand as a powerful method of gain bandwidth and phase margin enhancements. In this paper, a frequency-dependent current mirror, whose input impedance increases with frequency, is used to form the feed forward path at the input of the current mirror with a feed forward capacitor. By using these techniques, the gain bandwidth product of the amplifier is improved from 115 MHz to 194 MHz, the phase margin is also improved from 85? to 95? and the gain is enhanced from 11 dB to 93 dB. This amplifier operates at 2.5 V power supply voltage drives a capacitive load of 1pF and gives a power dissipation of 7 mW. The predicted performance is verified by simulations using HSPICE tool with 0.8 fim CMOS AMS parameters.

The Research of Capacitive Load Influence on Inductive Voltage Divider

2013 ◽  
Vol 718-720 ◽  
pp. 1537-1541
Author(s):  
Yan Qiang Li ◽  
Wen Feng Li ◽  
Hai Ming Shao ◽  
Fei Peng Lin ◽  
Bo Liang ◽  
...  
Keyword(s):  
High Voltage ◽  
Voltage Dependence ◽  
Low Voltage ◽  
Analytical Formula ◽  
Voltage Divider ◽  
Model Analysis ◽  
Circuit Model ◽  
Capacitive Load ◽  
In Series ◽  
Inductive Voltage Divider

The inductive voltage divider is usually used and calibrated at no-load situation, but it also used at taking load situation. For example in the situation of measuring voltage dependence of low voltage capacitors and detecting high voltage bridge, the inductive voltage divider need to take two specific capacitors. This paper have researched the influence of specific capacitive load on its ratio and deduced the analytical formula through related experiments and circuit model analysis when it takes capacitor. And use the method of connecting resistor in series to compensate its ratio accuracy to 1×10-6 degree.

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