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A versatile three-stage operational amplifier with Second-stage Bypass Compensation scheme (SBC) is proposed. At high frequencies, the second stage is bypassed using a capacitive feed-forward path, reducing the amplifier to a two-stage one. Unity closed-loop gain stability is then ensured using a conventional two-stage compensation technique. Two single-ended topologies and one fully differential...
An ultra-low power, low-noise, high power supply rejection (PSR) op-ampless regulator is presented in this paper. It uses a native composite power transistor plus a sandwich on-chip native capacitor in the pre-regulator to enhance broadband high PSR performance. Besides, a pseudo-resistor based low-pass filter is used to reduce the Brokaw's voltage regulator circuit noise. Realized using GlobalFoundries...
An improved dynamic-biased CMOS operational amplifier for biomedical circuits is presented in this paper. The proposed ultra-low power operational amplifier comprises a weak-inversion biased differential input stage, a pseudo class-AB output stage and a multi-phase master bias dynamic biasing circuit. Using GLOBALFOUNDRIES 0.18 μm CMOS process, the proposed amplifier, without dyamic biasing circuit,...
A micropower high-gain, low-noise differential difference amplifier (DDA) is presented in this paper. The new circuit incorporates the gate-bulk driven transistor pairs for input stage transconductance enhancement; the very high gain folded telescopic cascode structure that permits small headroom operation; and the replica tracking bias that sustains the circuit performance against variations of process,...
A new micropower high power-supply-rejection (PSR) regulator, on the basis of op-amp-less architectural design, is presented in this paper. The proposed regulator is based on the embodiment of the Brokaw bandgap regulator circuit in an additional feedback control loop so as to achieve high efficiency in terms of referenced PSR bandwidth per current. The measured PSR performance without any filtering...
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