A grounded constant current source employing a single oper-j; >; -2y, = &g i (2kk+ 1). (A9 ationd amplifier is discus&. It is shown that improved bandwidth and k k I reduced slew rate limitations are obtained with this: circuit. Similarly the second product can be shown to be given by I: INTR~DUCDON fi xj’ 1 2k+l ( > N!(N+ l)! Circuit 1 of Fig. 1 is a commonly used single OP AMP j=k+ 1 X,‘-Xk’ ...

In this paper the Darlington pair and internal circuit biasing technique is used for the enhancing the slew rate as well as gain and unity gain bandwidth. The proposed CMOS Op-Amp has been verified through Cadence Analog Design Environment with spectre simulator in the standard 45nm CMOS process. In this proposed circuit the gain stage is divided in two parts, first is modified gain stage and s...

The implementation of currentfeedback op-amps (CFB op-amps) relies on the use of a semiconductor process with complementary device structures for class AB operation of the input and output stages. Thus, CMOS technology is an obvious candidate. However, commercial CFB opamps are all realized in bipolar processes. In this paper we identify some of the problems related to the application of CMOS t...

Design of switched capacitor circuits in scaled CMOS technologies is becoming difficult because of low device intrinsic gain and reduced power supply voltage. To solve these problems, comparator-based switched-capacitor (CBSC) circuits and zero-crossing based circuits (ZCBC) were suggested as a possible solution to the op-amp based circuits. In this thesis, we explore zero-crossing based circui...

The impact of the settling behaviour of operational amplifiers (op-amps) used to implement switched-capacitor resonators on band-pass sigma-delta (BP) modulator performance is investigated. Behavioural simulations of a second-order BPmodulator are performed by means of numerical models which allow the designer to well-describe high-order dynamics occurring in real op-amp circuit implementa...

The commercial used the 555 single timer and 741 operational amplifiers (op-amp) were investigated under gamma-ray radiation of Co-60 source. maximum total doses 2 kGy 4 to irradiate. abnormal behavior in circuit frequency was observed, which decreased from 202 195 Hz at 744 Gy radiations. In op-amp circuit, output signal dropped 1.28 1.25 same dose. loss amplitude calculated about 2.3 % when d...