A transconductance amplifier is presented, in which the concept of a variable bias current has been introduced. The bias current is a function of the input signal. This amplifier has a very low standby power dissipation and a high driving capability.

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.

/pdf/microwatt-switched-capacitor-circuit-design-2409sdon0i.pdf

CMOS Adaptive Biasing Amplifier

Microwatt Switched Capacitor Circuit Design

The evolution of wireless communications is obviously linked to the power consumption of devices, which also continues increasing due to the growing amount of data and transmission speed required by the new communication standards. In contrast, the energy available in portable batteries does not grow at the same rate, improving only their capacity in a 10% every two years (Shahab, 2010). This leads to an increasingly gap between power needs and battery capacity. Therefore, energy efficiency of electronics systems has become a crucial factor to maximize the lifetime of the available batteries and one of the most important research topics in integrated circuits design in recent years.

background or methods

/pdf/achieving-energy-efficiency-in-analogue-and-mixed-signal-otnhoyuvdf.pdf

CMOS Adaptive Biasing Amplifier

Citations

Microwatt Switched Capacitor Circuit Design

Achieving Energy Efficiency in Analogue and Mixed Signal Integrated Circuit Design

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