Power supply rejection ratio

Engineering ratios

In electronic systems, power supply rejection ratio (PSRR), also supply-voltage rejection ratio (kSVR; SVR), is a term widely used to describe the capability of an electronic circuit to suppress any power supply variations to its output signal. In the specifications of operational amplifiers, the PSRR is defined as the ratio of the change in supply voltage to the equivalent (differential) output voltage it produces, often expressed in decibels. An ideal op-amp would have infinite PSRR, as the device should have no change to the output voltage with any changes to the power supply voltage. The output voltage will depend on the feedback circuit, as is the case of regular input offset voltages. But testing is not confined to DC (zero frequency); often an operational amplifier will also have its PSRR given at various frequencies (in which case the ratio is one of RMS amplitudes of sinewaves present at a power supply compared with the output, with gain taken into account). Unwanted oscillation, including motorboating, can occur when an amplifying stage is too sensitive to signals fed via the power supply from a later power amplifier stage. Some manufacturers specify PSRR in terms of the offset voltage it causes at the amplifiers inputs; others specify it in terms of the output; there is no industry standard for this issue. The following formula assumes it is specified in terms of input: where is the voltage gain. For example: an amplifier with a PSRR of 100 dB in a circuit to give 40 dB closed-loop gain would allow about 1 millivolt of power supply ripple to be superimposed on the output for every 1 volt of ripple in the supply. This is because . And since that's 60 dB of rejection, the sign is negative so: Note: * The PSRR doesn't necessarily have the same poles as A(s), the open-loop gain of the op-amp, but generally tends to also worsen with increasing frequency (e.g. http://focus.ti.com/lit/ds/symlink/opa2277.pdf). * For amplifiers with both positive and negative power supplies (with respect to earth, as op-amps often have), the PSRR for each supply voltage may be separately specified (sometimes written: PSRR+ and PSRR−), but normally the PSRR is tested with opposite polarity signals applied to both supply rails at the same time (otherwise the common-mode rejection ratio (CMRR) will affect the measurement of the PSRR). * For voltage regulators the PSRR is occasionally quoted (confusingly; to refer to output voltage change ratios), but often the concept is transferred to other terms relating changes in output voltage to input: Ripple rejection (RR) for low frequencies, line transient response for high frequencies, and line regulation for DC. (Wikipedia).

Physics 40 Resistivity and Resistance (6 of 32)

Visit http://ilectureonline.com for more math and science lectures! Ohms, wiring, resistors and resistance; all these topics will be explained in detail in this eight part lecture series. Next video in Resistivity and Resistance series can be seen at: http://youtu.be/V3cbPIxHpeU

From playlist PHYSICS 40 RESISTIVITY AND RESISTANCE

Physics 40 Resistivity and Resistance (7 of 32)

From playlist PHYSICS 40 RESISTIVITY AND RESISTANCE

Resistors in Electric Circuits (10 of 16) Combination Resistors No. 2

Shows how to determine the voltages, resistances and currents for a circuit containing two resistors in series resistors that are in parallel with one other resistor. In a series circuit, the current is only able to flow through a single path. In a series circuit, the current is the same

From playlist DC Circuits; Resistors in Series and Parallel

Physics 40 Resistivity and Resistance (11 of 32) Power Dissipation with Changing Currents

Visit http://ilectureonline.com for more math and science lectures! In this video I will find the power dissipation with changing current of a resistor.

From playlist PHYSICS 40 RESISTIVITY AND RESISTANCE

Radius and interval of convergence of a power series, using ratio test, ex#5

Radius and interval of convergence of a power series, radius of convergence of a power series, interval of convergence of a power series, convergence set of a power series, ratio test for power series, find R and I of a power series with ratio test, power series radius of convergence

From playlist Power Series Review (Nagle's Sect8.2)

Physics 40 Resistivity and Resistance (22 of 33) V=? Between 2 pts on a Conductor with Current

Visit http://ilectureonline.com for more math and science lectures! In this video I will find the potential between any 2 points on a conductor carrying a current.

From playlist PHYSICS 40 RESISTIVITY AND RESISTANCE

Resistors in Electric Circuits (1 of 16) Series vs. Parallel

Describes the rules governing the voltage, resistance and current for parallel circuits and series circuits. In a series circuit, the current is only able to flow through a single path. In a series circuit, the current is the same throughout the entire circuit. The voltage in a series ci

From playlist DC Circuits; Resistors in Series and Parallel

EEVBlog #1119 - Designing a 1kV Isolated Oscilloscope

Bart Schroder from Cleverscope talks about the challenges in designing the world's highest performance isolated oscilloscope. Measurement demo on a 500V MOSFET H-Bridge and how to accurately probe it. Then a teardown and walk through of the design of the new CS448 1kV 4CH 200MHz 14bit iso

From playlist Product Reviews & Teardowns

9. More Compensation

MIT Electronic Feedback Systems (1985) View the complete course: http://ocw.mit.edu/RES6-010S13 Instructor: James K. Roberge License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu

From playlist MIT Electronic Feedback Systems (1985)

Marcelo Pereyra: Bayesian inference and mathematical imaging - Lecture 4: mixture...

Bayesian inference and mathematical imaging - Part 4: mixture, random fields and hierarchical models Abstract: This course presents an overview of modern Bayesian strategies for solving imaging inverse problems. We will start by introducing the Bayesian statistical decision theory framewo

From playlist Probability and Statistics

Physics - E&M: Ch 41.3 Ohm's Law & Resistor Circuit Understood (11 of 27) Power of a Resistor

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain that a resistor or multiple resistors in a circuit actually consumes energy. The resistor(s) take electrical energy and convert it to heat, in other words, they consumes power. When a battery

From playlist PHYSICS 41.3 OHM'S LAW AND RESISTORS UNDERSTOOD

EEVblog #476 - Opamp Offset Voltage Measurement

Dave investigates an issue with the input offset voltage on the Analog Devices AD8628 zero-drift chopper opamp. The answer will be presented in the next video. All EEVblog Opamp related videos are here: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf Forum Topic:

From playlist Opamps - Tutorials & Practicals

Resistors in Electric Circuit (11 of 16), Equivalent Resistance for Series Resistors

Explains how to calculate the equivalent resistance for resistors in series. In a series circuit, the current is only able to flow through a single path. In a series circuit, the current is the same throughout the entire circuit. The voltage in a series circuit is divided across each of th

From playlist DC Circuits; Resistors in Series and Parallel

Mod-01 Lec-12 Thermodynamics of Compressors

Jet Aircraft Propulsion by Prof. Bhaskar Roy and Prof. A. M. Pradeep, Department of Aerospace Engineering, IIT Bombay. For more details on NPTEL visit http://nptel.iitm.ac.in

From playlist IIT Bombay: Aerospace - Jet Aircraft Propulsion (CosmoLearning Aerospace Engineering)

EEVblog #363 - Gold Phone Teardown

What's inside a Telstra CT4 "Gold Phone" Payphone? And how do electronic coin validators work? Forum Topic: http://www.eevblog.com/forum/blog-specific/eevblog-363-gold-phone-teardown/ EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore

From playlist Electronics Teardowns

EEVblog 1415 - Reverse Engineering the DP10007 Differential Probe

Reverse engineering the Micsig DP10007 high voltage differential probe. Turning the PCB into a schematic. Reverse enginering how-to for the Rigol oscilloscope: https://www.youtube.com/watch?v=lJVrTV_BeGg DIY light box for PCB photography: https://www.youtube.com/watch?v=6ZH2KeplSrs Foru

From playlist Reverse Engineering

EEVblog #972 - Operating Chips Outside Their Spec

Dave tests the AD8436 True RMS converter chips inside the 121GW multimeter to see if it works well below it's voltage rail specification. Bonus thermal testing in the chamber. http://www.analog.com/media/en/technical-documentation/data-sheets/AD8436.pdf Forum: http://www.eevblog.com/forum/

From playlist Hacking / Experiments

EEVblog #324 - DC-DC Converter Testing - USB Supply Part 4

Forum Topic: http://www.eevblog.com/forum/blog-specific/eevblog-324-dc-dc-converter-testing-usb-supply-part-4/ Some quick testing of a 2W DC-DC converter. EEVblog Main Web Site: http://www.eevblog.com EEVblog Amazon Store: http://astore.amazon.com/eevblogstore-20 Donations: http://www.ee

From playlist USB Power Supply Design

Electrical Engineering: Ch 12 AC Power (33 of 58) What is the Power Factor?

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what is power factor. We know that when the current leads the voltage means the phase angle less than 0 then the power factor ls leading, and when the voltage leads the current means the phase

From playlist ELECTRICAL ENGINEERING 12 AC POWER

EEVblog #222 - Lab Power Supply Design - Part 2

PART 1 is HERE: http://www.youtube.com/watch?v=CIGjActDeoM Part 2 of Dave's Open Hardware constant current linear regulated lab power supply design. An in-depth look at the LT3080 datasheet, the LM334 current source, and a few more circuit tweaks before it's ready to build in the next epi

From playlist Power Supply Design

Power supply rejection ratio

Related pages