Article

Power supply rejection ratio in operational transconductance amplifiers

Dept. of Electr. Eng., Katholieke Univ. Leuven, Heverlee
IEEE Transactions on Circuits and Systems 10/1990; 37(9):1077 - 1084. DOI: 10.1109/31.57596
Source: IEEE Xplore

ABSTRACT

The power supply rejection ratio (PSRR) of operational amplifiers
is analyzed. An analyzing technique based on cuts in subcircuits is
presented. The technique allows hand calculation of the PSRR of any
circuit. It is shown that the PSRR of the single-stage operational
amplifier (OTA) is one order of magnitude better than the commonly used
Miller OTA. The analyses are compared with hand calculations and SPICE
level-2 simulations on a realized improved Miller OTA structure

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    • "The subtractor can be easily implemented using two NMOS transistors illustrated in Fig.3. Using a two-stage miller amplifier [4], the contribution of supply noise at V 2 would be small compared to the supply noise at diode MN1, thus v 2 (the gate voltage at MN2) = 0. The output of subtractor stage is given by (via resistance division) "
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    ABSTRACT: This paper presents a novel two-stage low dropout regulator (LDO) that minimizes output noise via a pre-regulator stage and achieves high power supply rejection via a simple subtractor circuit in the power driver stage. The LDO is fabricated with a standard 0.35mum CMOS process and occupies 0.26 mm<sub>2</sub> and 0.39mm<sub>2</sub> for single and dual output respectively. Measurement showed PSR is 60dB at 10kHz and integrated noise is 21.2uVrms ranging from 1kHz to 100kHz
    Full-text · Conference Paper · Oct 2005
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    • "BUNDANT literature exists on the measurement and/or simulation of the frequency-dependent operational amplifiers (opamp) characteristics such as the open loop gain ([1]–[6]), the common mode gain or common mode rejection ratio ([1], [7]–[9]), and the power supply gains , or power supply rejection ratios , ([10], [11]). In all cases, single-sine measurements and/or simulations are performed to obtain the operational amplifier characteristics. "
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    ABSTRACT: Using specially designed broadband periodic random excitation signals, the open loop, the common mode, and the power supply gains of operational amplifiers are measured and modeled. The proposed modeling technique: 1) takes into account the measurement uncertainty and the nonlinear distortions, 2) gives information about possible unmodeled dynamics, 3) detects, quantifies, and classifies the nonlinear distortions, and 4) provides opamp parameters (time constants, gain-bandwidth product, etc.) with confidence bounds. The approach is suitable for the experimental characterization of operational amplifiers (see [23]) as well as the fast evaluation of new operational amplifiers designs using network simulators (see Part I). Part I describes the modeling approach and illustrates the theory on simulations.
    Preview · Article · Jul 2004 · IEEE Transactions on Instrumentation and Measurement
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    • "BUNDANT literature exists on the measurement and/or simulation of the frequency-dependent operational amplifiers (opamp) characteristics such as the open loop gain ([1]–[6]), the common mode gain or common mode rejection ratio ([1], [7]–[9]), and the power supply gains , or power supply rejection ratios , ([10], [11]). In all cases, single-sine measurements and/or simulations are performed to obtain the operational amplifier characteristics. "

    Preview · Article · Jan 2004
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