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.

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A current mode Instrumentation amplifier in CMOS technology, is presented. The circuit is based on the use of two positive current conveyors of second generation and a current differential output stage. The device exhibits high common-mode rejection ratio which is gain unaffected in a wide frequency band. SPICE simulation results are promising for high frequency medical applications.

SUMMARYA technique is proposed for obtaining current-mode filters based on current mirror arrays that operate as unity gain current amplifiers. These amplifiers by properly driving capacitors realize active lossless integrators which are the basic active elements for the derivation of filters according to the leapfrog method. Due to the fact that both the structure of the amplifiers and the adapted method for filter design are simple, the proposed technique is attractive for filter design and implementation. A design and the implementation of two third-order low-pass filters are presented. The array of the amplifiers has been implemented in a 0.8 m CMOS technology.

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