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Archive for the ‘1.ANALOG’ Category

MOS Diode/Active Resistor Current Sinks and Sources

June 19, 2017 Leave a comment

MOS Diode/Active Resistor

  • Gate and Drain of MOS transistor are tied together
  • I-V characteristics are qualitatively similar to a pn-junction diode (MOS diode)
  • The MOS diode is used as component of a current mirror and for level translation (voltage drop).

 

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CMOS Power Consumption and Cpd Calculation

April 22, 2016 Leave a comment

Screen Shot 2016-04-22 at 4.02.29 PM

Reduction of power consumption makes a device more reliable. The need for devices that consume a minimum amount of power was a major driving force behind the development of CMOS technologies. As a result, CMOS devices are best known for low power consumption. However, for minimizing the power requirements of a board or a system, simply knowing that CMOS devices may use less power than equivalent devices from other technologies does not help much. It is important to know not only how to calculate power consumption, but also to understand how factors such as input voltage level, input rise time, power-dissipation capacitance, and output loading affect the power consumption of a device. This application report addresses the different types of power consumption in a CMOS logic circuit, focusing on calculation of power-dissipation capacitance (Cpd), and, finally, the determination of total power consumption in a CMOS device.

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Categories: Others, Power

Understanding Poles and Zeros

February 5, 2016 Leave a comment
Categories: Stability

Effect of Feedback on BW

February 5, 2016 Leave a comment
Categories: Stability

Frequency Response of Feedback Amplifier

February 5, 2016 Leave a comment
Categories: Stability

How to Apply Low-Dropout Regulators Successfully

September 1, 2015 Leave a comment

A low-dropout regulator (LDO) is capable of maintaining its specified output voltage over a wide range of load current and input voltage, down to a very small difference between input and output voltages. This difference, known as the dropout voltage or headroom requirement, can be as low as 80 mV at 2 A. The adjustable-output low-dropout regulator1 first came to public attention in 1977. Nowadays, portable devices often require up to 20 low-dropout linear regulators. Many of the LDOs in today’s portable devices are integrated into multifunction power-management ICs2 (PMICs)—highly integrated systems with 20 or more power domains for audio, battery charging, housekeeping, lighting, communications, and other functions.

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Categories: 1.ANALOG, LDO

Low Drop-Out (LDO) Linear Regulators: Design Considerations and Trends for High Power- Supply Rejection (PSR)

September 1, 2015 Leave a comment

Power Management

• Why do we need power management?

– Batteries discharge“almost”linearly with time.

– To optimize the charging of batteries to be safe and extend their life.

Categories: 1.ANALOG, LDO