Pulse Width Modulation (PWM) or Pulse Duration Modulation (PDM) is a technique of converting analog signals into rectangular waveforms. The width of the waveform varies in proportion with the ...

Using an innovative photonics topology, researchers developed an integrated microwave filter with ultra-wide dynamic range and low noise. How photonics can provide high-performance RF filtering. The ...

So you have an old tube-type transmitter as a backup. It ran perfectly when you last turned it on two years ago to substitute for your then-ailing solid-state main transmitter. Now you need it again.