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Multistage operational amplifiers suitable for nanometer-scale CMOS technologies and low-voltage applications are described. The low intrinsic gain of transistors is compensated for with cascade of single-stage amplifiers. Techniques for compensations are revisited and the optimal solution identified. An example of a novel scheme that achieves 67 dB of DC gain, 320 MHz of bandwidth and 61 degrees...
As CMOS technology continues to evolve, the supply voltages are decreasing while at the same time the transistor threshold voltages are remaining relatively constant. Making matters worse, the inherent gain available from the nano-CMOS transistors is dropping. Traditional techniques for achieving high-gain by cascoding become less useful in nano-scale CMOS processes. Horizontal cascading (multi-stage)...
This paper presents a well-established low power sample & hold circuitry, implemented in 180-nm CMOS technology. This circuit uses a systematic and optimal design of hybrid cascode compensation method which is used in fully differential two-stage CMOS operational transconductance amplifiers (OTAs). The circuit achieves minimum SNR of 74 dB in all corner cases. Also average current dissipation...
A new frequency compensation technique for low-power, area-efficient multistage amplifiers is introduced in this work. By utilizing active capacitors to realize the compensation network in a nested way, two inverting gain stages can be used as the second and third gain-stages. The proposed scheme reaches better bandwidth-to-power and slew-rate-to-power performances comparing to the ever published...
A new frequency compensation scheme for multistage amplifier, named capacitor-multiplier frequency compensation (CMFC), is introduced. Increasing the capacitance with a current-mode multiplier in CMFC amplifier allows the circuit to occupy less silicon area and to drive large capacitive loads more effectively. Moreover, smaller physical capacitance results in higher gain-bandwidth product (GBW) and...
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