This paper proposes a methodology for the parametric design of operational transconductance amplifiers. In the proposed methodology, amplifier sizing is performed in two stages: an equation-based design scheme performs an approximate design, followed by optimization of the design results with genetic algorithms. The feasibility of this method was investigated with extensive simulation. For demo...

T h e technique of mirror biasing i s introduced and applied to a very high gain two stage CMOS cascode op-amp, in order to desensitize i ts output voltage to bias variations. Various performance metrics like low frequency common mode and power supply rejection ratios, slew rate and the sensitivity of the systematic offset are substantially improved. The improved performance i s theoretically p...

This paper reviewed the efficiency of CMOS class AB power amplifier topology especially in gigahertz frequencies. is a compromise between A and B terms linearity 50% to 78.5%. However, cannot have good simultaneously due breakdown gate-oxide voltage effects from hot carrier. The oxide prevents optimum drain signal effect carrier will reduce quality overall PA design. Several works year 1999 201...

This paper analyzes the main factors limiting bandwidth expansion of low-noise amplifiers (LNA) and designs a broadband LNA with 2-40.5 GHz. The is designed using multiple methods, including cascode, resistance feedback, cascode Darlington amplifier. amplitude-frequency characteristics principle three structures are studied theoretically based on small-signal equivalent circuit model. Thanks to...

In this paper presents a optimization of linearity of low noise amplifier by using post linearization techniques. in this technique we have used diode connected mosfet as IMD sinker also used interstage matching for gain enhancement and reducing the effect of nonlinearity in common gate stage of cascode amplifier, this has done by using UMC .18um CMOS Technology in cadence tool. We got gain 14d...

In this paper, two fully-differential low noise amplifiers based on classical cascode topologies are presented. The first one is enhanced with noise canceling technique and the second one is based on a negative feedback stage. These circuits have been designed to fulfill the lower band of SKA requirements with a 1.5 GHz bandwidth below 2 GHz. Both chips have been implemented using NXP QUBIC4G S...

In this paper we present a three-stage fully differential operational amplifier in 120nm digital CMOS. To reach high gain gain-boosted cascodes in the first stage are used. The gain-boost amplifiers are realized as two-stage amplifiers with self cascodes. A DC gain of 108dB and an unity-gain frequency of 1.06GHz are achieved at 1.2V supply. The operational amplifier is appropriate for supply vo...