Technical Notes




Frequency Response Measurements



The Frequency Response or Analog Network Analyzer can measure Magnitude and Phase which allows measurements for the following applications:


  • Filter characterization including Insertion loss, passband and stopband frequencies
  • Component characterization including impedance and resonant frequencies
  • Bode style plots for loop gain/feedback stability analysis of amplifiers, power supplies and control systems
  • Bandwidth of input and output stages


Graph of the Frequency Response of a 10.7 MHz Bandpass Filter

Graph: Frequency Response





Basic Setup:


Basic Setup

The analyzer has two input channels for ratioed, transfer function measurements.


To obtain a circuit's transfer function, the analyzer's source and channel A are connected to the circuit's input node while channel B is connected to the circuit's output node.


The source signal, which provides the stimulus for the circuit under test, can be injected into the circuit either directly or AC coupled using a transformer. The frequency sweeps can be either logarithmic (for Bode type plots) or linear.