Current differential amplifiers: new circuits and applications

Abstract

SUMMARYNew CMOS current di erential ampliÿers are proposed suitable for analogue signal processing at high frequencies. They consist of simple current mirrors, which are easy to design and to implement in IC form. Low-voltage low-power design is feasible. Relying on these devices a number of applications are obtained, including lossy and lossless integrators, simulated inductors, active ÿlters, and harmonic oscillators. Theoretical expressions are given for all of the proposed new circuits. The veriÿcation of the circuits is also achieved by simulation.

Electronically controlled multiphase sinusoidal oscillators using current amplifiers

“…Equation (6) indicates that the current gain K of each current amplifier depends only on the number of phases (N ) of the MSO and, consequently, on the number of the employed current amplifiers.…”

“…A number of voltage-mode topologies have been introduced in [1][2][3][4]. Current-mode signal processing is a very promising technique for implementing systems with high-frequency operation capability [5,6]. A current follower based current-mode MSO has been introduced in [7].…”

The comparative analysis of current mirror based CMOS current amplifiers

“…Therefore, the design of the circuit is very simple. Moreover, since the amplifier topology has modular structure, the CA is easily implemented in IC form without extra processes [2,8,9]. The differential output current of CA circuit is defined as follows:…”

“…In principle, the output current ought to be free from noise and the circuit must have high output impedance. Current mirrors are commonly found in circuits such as amplifiers, comparators, and regulated current sources, etc [8,9,10,11].…”

Digitally Controllable Current Amplifier and Current Conveyors in Practical Application of Controllable Frequency Filter

“…Current amplifiers are basically simple active components that can be easily used in various areas of analogue signal processing. Differential current amplifier (DCA) is introduced in [1] and current differential input amplifier (CDA) including also its full differential version -current differential input differential output amplifier (CDDA) is mentioned in [2]. Some current amplifiers, which are suitable for the current mode, can be found in literature as current operational amplifier (COA) [3,4].…”