A 1 V rail-to-rail constant-gm CMOS operational amplifier is proposed. This study shows that keeping the sum of currents in the complementary differential pairs constant rather than controlling the tail currents produces a constant-gm input stage operating in the weak inversion. The currents in the n-channel differential pair are regulated to keep the sum of currents in the complementary differ...

Genetic programming was used to evolve both the topology and sizing (numerical values) for each component of a low-distortion, low-bias 60 decibel (1000-to-1) amplifier with good frequency generalization.

A current mode feedback operational amplifier designed using a complimentary MOS circuit technology has been discussed in this paper. A class AB amplifier has been used in the design and the design results in improvement of values of number of parameter when compared to the previously reported architecture. The circuit is designed using 0.35μm technology. Bandwidth of the presented architecture...

By delving a little more deeply into the Sallen-Key filter's component sensitivities, we discover a "sweet spot" in the mathematical analysis that allows the design of simple, single op amp filters whose performance rivals that of more complicated filters. This approach has been useful in extending the utility of Sallen-Key filters. Dozens of filter topologies have been devised over the years, ...

In this paper a new method for determining the component values and transistor dimensions for CMOS operational amplifiers (Op-Amps) is presented. As a wide variety of design objectives and constraints are Posynomial function of the design variables, the Optimization is done by Geometric Programming. As a consequence we can efficiently determine globally optimal trade-offs among competing perfor...

The LH0024 and LH0032 are very high speed general purpose operational amplifiers exhibiting 70 MHz bandwidths, 500 V/ms slew rates and 100 to 300 ns settling time to 0.1%. The LH0032 has the added advantage of FET input characteristics. Both, however, can drive loads with peak currents of 100 milliamperes (mA). The op amps are stable without external compensation when operating at closedloop ga...

The problem of CMOS op-amp circuit sizing is addressed here. Given a circuit and its performance specifications, the goal is to automatically determine the device sizes in order to meet the given performance specifications while minimizing a cost function, such as a weighted sum of the active area and power dissipation. The approach is based on the observation that the first order behavior of a...