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Network analyzer evaluation of RF amplifier using Agilent B2961A/62A
Agilent B2961A/B2962A 6.5 Digit Low Noise Power Source

The Agilent B2961A/62A provides precise DC
voltage or current for RF amplifier S-parameter
measurements


RF device Evaluation Using the Agilent B2961A/62A as a precise bias source
To determine RF device performance, design and test engineers generally measure electrical The B2961A/62A's voltage source mode can be used to bias amplifiers. The applied bias cur
characteristics such as S-parameters, frequency bandwidth, distortion, etc. rent will be the difference between the source and device voltages divided by the value of the
Analyzers (network analyzers, spectrum analyzers, etc.) are commonly used to perform these mea- external bias resistor used.
surements. Since most RF devices do not have an on-chip bias circuit, in addition to an analyzer a In situations where characteristics over temperature or multiple bias current values need to be
voltage or current source is usually required to power and bias the device (in conjunction with a observed, it is more convenient to use the B2961A/62A's current source mode as opposed to
bias resistor). This document outlines how to perform MMIC RF amplifier S-parameter measure- its voltage source mode since the device voltage will vary depending on both temperature and
ments using the Agilent B2961A as the DC bias source. bias current
The Agilent B2961A/62A's internal feedback mechanisms enable it to source precise and stable
voltages and currents at their specified setting values despite varying load conditions. In addi
Advantages of the B2961A/62A Low Noise Power Source tion, users can easily switch between voltage and current sourcing without changing any cable
connections.
A revolutionary power supply for precision low-noise voltage and current sourcing


Superior 6.5 digit 100 nV/10 fA resolution

Wide 210 V/3 A (10.5 A pulse) bipolar range
Benefits