Introduction: As part of a study that investigates a substantially distributed multi-channel parallel transmit approach, head-size 32-element transmit/receive arrays were developed. The specific goal of the coil development is to facilitate reduction of RF power dissipation in the imaged object / the coil structure, and to facilitate B1 shimming / accelerated parallel excitation for an arbitrar...

This paper presents a rail-to-rail constant-gm operational amplifier input stage. The proposed circuit changes the tail current of the input differential pairs dynamically for a constant-gm by using dummy input differential pairs. The problem which causes total gm variation is input pairs and dummy input pairs can not take effect at the same time with the common-mode input voltage changes, beca...

A new MOS-C bandpass-low-pass filter using the current feedback operational amplifier (CFOA) is presented. The filter employs two CFOA’s, eight MOS transistors operating in the nonsaturation region, and two grounded capacitors. The proposed MOS-C filter has the advantage of independent control of Q and !o. PSpice simulation results for the proposed filter are given.

This paper presents a novel CMOS differential voltage current conveyor based on a wide linear range transconductor with common mode detection. The differential voltage current conveyor exhibits a wide dynamic input range of ±0.9V. It is used to realize an instrumentation amplifier, a multiple input single output filter, and a single input multiple output universal filter. PSPICE simulations of ...

This article presents a simple current-mode quadrature oscillator using a single Current Differencing Transconductance Amplifier (CDTA) as the active element. The oscillation condition and oscillation frequency can be electronically controlled. The circuit structure is very simple, consisting of merely one CDTA, one resistor and two capacitors. The proposed circuit is suitable for IC architectu...

Class-AB circuits, which are able to deal with currents which are orders of magnitude larger than their quiescent current, are good candidates for low-power analog design. This paper presents a new, simple, class-AB current-mirror, based on the Flipped Voltage Follower [1]. In the authors knowledge this is the first class-AB currentmirror which operates with a supply voltage smaller than two tr...

A 5Gb/s optical receiver front-end for optical interconnection is presented in this paper. A transimpedance amplifier (TIA), limiting amplifiers (LA), output buffer and a bias circuit are integrated in deep Nwell 0.18 m CMOS technology. As the input current amplitude is 30 A, the differential output voltage is achieved to be 124 mV. The linear gain is 78.8dB and consumes 200mW under 1.8V supply...

To proof low voltage techniques are valid in current conveyor design, Bulk driven and composite transistor (self cascode) techniques are used to get high performance results from CCII in low voltage supply. Conventional operational amplifier circuit from literature was our choice as core of the design. Our Focus with using low voltage techniques is study the frequency characteristics of a CCII ...

This paper presents a first of its kind canonic realization of active RC (ARC) sinusoidal oscillator with non-interactive/independent tuning laws, which simultaneously provides buffered quadrature voltage outputs and explicit quadrature current outputs. The proposed circuit is created using a new active building block, namely the Z-copy controlled-gain current differencing buffered amplifier (Z...