Signal generators and waveform generators are used to test and align all types of transmitters and receivers, to measure frequency and to generate a signal, waveform or noise source.

Oscillators are devices that are used to generate repetitive signals.

Phase-locked loop (PLL) frequency synthesizers are electronic devices that produce frequencies coherent to a reference frequency

Voltage-to-frequency converters accept a voltage signal and convert its analog level to a signal with a corresponding frequency

Frequency-to-voltage converters accept a signal and convert its frequency to a corresponding analog voltage level

RF frequency multipliers are nonlinear devices that produce an output signal with a frequency that is larger than the frequency of a corresponding input signal by a predetermined factor

Frequency meters are instruments that provide analog outputs as frequencies that vary as a function of the applied input.