Power Supply Rejection Ratio Measurement
PSRR for Opamp and Voltage References
PSRR is an important parameter to measure for Opamps and voltage references. PSRR is a significant performance concern as even small amounts of high frequency ripple voltage at the input can significantly degrade the output precision of voltage reference and impact downstream circuitry. The output of the Opamp is not only a function of the inputs, but also of the power supply.
The test setup uses the J2120A to add a signal/noise onto the power supply voltage. The attenuation (Vout/Vin ratio) is then measured by the VNA. The J2102B is usually needed to address ground loop issues.
The PSRR of Voltage Regulators
Products
Articles & Documents
Analog Output Signal Modulated by VRMs
Masashi Nogawa’s latest article examines how the output noise signal of RF or analog electronic components is affected by disturbances in their power supply…
How to Test PSRR, PSNR and PSMR for Sensitive Applications, Including Optical Transceivers
Click here to download the paper Presented by: Steven M. Sandler, Managing Director, Picotest Originally presented on October 5, 2022 during EDI CON Online…
Picotest Bundle Supports Tektronix, Keysight, Siglent, and Rohde & Schwarz Scope FRA Features – Bode Plots and PSRR Testing
We have an FRA Bundle of signal injectors that enables Bode plots and PSRR (power supply rejection ratio) measurements for Keysight, Tektronix, Siglent, and…
Picotest Expands Line of PSRR Line Injectors Adding Inductor and Input Impedance Testing
We have released a new line injector for PSRR (power supply rejection ratio), DC-biased inductor, and DC-DC converter input impedance testing. The J2121A is…
Techniques for accurate PSRR measurements
By John Rice, System Engineer, Texas Instruments and Steve Sandler, Managing Director, Picotest IntroductionIn theory, measuring the power-supply-rejection ratio (PSRR) is relatively simple. A…
Measuring Op Amp PSRR
In this article we detail the process of measuring a key performance characteristic of operational amplifiers (Op Amps), power supply rejection ratio or “PSRR”,…
Measuring the PSRR of Voltage References
In this article we detail the process of measuring a key performance characteristic of voltage references, power supply rejection ratio or “PSRR”, using the…
Step-by-Step Guide to Measuring PSRR Using a Network Analyzer and the Line Injector
This application note shows how the Power Supply Rejection Ratio, or PSRR, of a linear voltage regulator (LM317) can be measured using the Picotest…