TEST & MEASUREMENT ANALOG DEVICES
Bipolar Power Solutions for Precision Test and Measurement System
Alan Walsh, system applications engineer, Analog Devices, says that in order to ensure high accuracy, precision test and measurement systems require power supply solutions with low levels of ripple and radiated noise so as not to degrade the performance of high resolution converter signal chains.
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n these test and measurement applications, generating system supplies that are bipolar and/or isolated poses a challenge to system
designers in terms of board area, switching ripple,
Data acquisition systems and digital
multimeters require low noise supplies in order to deliver the performance of high resolution ADC signal chains without being corrupted by Source measure units and dc sources/power supplies have similar requirements for minimising spurious output ripple on high resolution DAC
There is also a trend toward a higher channel count in precision test and measurement In electrically isolated applications, these multichannel instruments have an increasing need for channel-to-channel isolation where This is driving solutions that require a smaller and smaller PCB footprint while maintaining solutions in these applications can result in larger than desired PCB footprints and/or poor power 5mV of ripple at 1MHz would need a combined power supply rejection ratio (PSRR) of 60dB or ADC to reduce the switching ripple seen at the
integration with μModule® devices and reducing radiated noise and switching ripple such as Silent Switcher® devices and high power Many precision test and measurement instruments such as source measure units or
power supplies require multiquadrant operation to source and measure both positive and both negative and positive supplies from a single positive supply input with low noise and in an
supply generation from a single positive input generate ±15V and ±5V and use positive and switching ripple as well as generate additional The power rail solutions shown here were designed using the system designer found in design tool is a complete power supply design tool programme
Figure 1: Power solution for a nonisolated bipolar supply system (±15V and ±5V) with low supply ripple 20 November 2024 Irish Manufacturing
to the required positive supply, and invert it to number of components needed to do this - we
www.irish-manufacturing.com
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