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This paper presents a novel adaptive bias technique based on the use of squaring circuits. Here, the tail current of an operational amplifier (OpAmp) is controlled using an auxiliary circuit. By design, it generates a well-controlled tail current which — to a first order approximation — is independent of the OpAmp's common-mode input voltage. As a result, parameters like common-mode rejection ratio...
This paper presents a low voltage, low power readout front-end system implemented in 130 nm CMOS technology. A conventional architecture that consists of charge sensitive amplifier, pole/zero cancellation and shaper has been used. The work focuses on the design of novel circuit topologies in low voltage environment minimizing the power consumption in modern deep submicron CMOS technologies. An operational...
Five class AB CMOS voltage followers are described. They are modifications of the conventional super source follower, and allow improved dynamic performance, increased signal swing, accurate control of quiescent currents, and no penalty by the inclusion of class AB operation in terms of quiescent power consumption, circuit complexity or supply voltage requirements. Measurement results for a 0.5µm...
A CMOS voltage-to-current converter is presented. It is based on a class AB current mirror with very low input resistance and a passive resistor connected to the input for voltage-to-current conversion. Class AB operation is achieved without extra supply voltage requirements or static power consumption, using Quasi-Floating Gate techniques. Measurement results of a differential configuration for a...
A class AB tunable transconductor is presented, featuring low quiescent power consumption. Class AB operation is achieved using quasi-floating gate transistors. Highly linear tuning is obtained using resistive dividers implemented by transistors operating in triode region. Simulation results for a low-cost 0.5μm standard CMOS process are presented, validating the proposed approach.
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