VRTS Boards

The Voltage Regulator Test Standard (VRTS) boards enable you to checkout new measurement methods with a well-known DUT before applying these measurements to your own design.


The circuit is a discrete BJT voltage regulator with a 7‐10V input and a 3.3V output. The BJT is controlled by a TL431 shunt regulator. C1 and R5 provide frequency compensation, R2 is the injection transformer terminating resistor and R3 and R4 are the output voltage sense divider.

Two different output capacitors can be selected using S1‐1 and S1‐2. One capacitor, an aluminum electrolytic capacitor provides excellent phase margin while the other results in approximately 40 degrees phase margin. A blue LED is powered by the output, providing a visual indication of power on and also a load of approximately 20mA. An additional 25mA of load current can be switched on or off using S1‐3.

For more information have a look at the VRTS 1.5 Manual and our Application Notes.

The VRTS3 demonstration board is a self-contained board designed to support a wide range of typical distributed system measurements. Input power is provided via a USB port using a typical USB-A to USB-B cable. No additional equipment is required for this board other than the measurement instruments.

The board contains the eight individual circuit sections identified below. These circuits are typical in most distributed systems providing an excellent test bed for demonstrating non-invasive, in-system measurement, optimization and troubleshooting techniques.

Circuit Sections:

  • 5 V USB input to 3.3 V / 2.8 MHz switching regulator
  • 2.5 V low noise voltage reference
  • 245 MHz Bandwidth unity gain opamp buffer
  • LD1086 voltage regulator 5 V USB input to 3.3 V output
  • 10 MHz and 125 MHz clocks
  • Short-Open-Load and 1 Ohm calibration ports
  • Parallel tantalum and ceramic capacitor on a small PCB plane 50 Ω microstrips with precision aberrations - one with a ground void

For more information feel free to download the VRTS3 product Manual.

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