The loop gain could be adaptively adjusted according to the frequency discriminator
The Design of Phase Domain Maximum Likelihood Frequency Estimator and Its Frequency Discriminator
His topics include simulating the PLL linear operational mode, phase noise and other spurious interferers, carrier recovery applications and acquisition, interfacing the frequency discriminator
to the PLL, and frequency synthesis applications.
Each IFM receiver incorporates a digital frequency discriminator
, which provides digital encoding of wide band RF input signal frequency data for pulsed or continuous-wave signals.
An input signal from the dynamic selector is divided in a divider (1) between a frequency discriminator
(2) and second filter (3).
In order to assess the proposed architecture, a prototype of the proposed six-port-based delay-line frequency discriminator
has been fabricated.
The oscillator phase noise is characterized in the free running mode using a test bench based on a frequency discriminator
.  A cross-correlation technique is used that allows a phase noise floor of -125 dBc/Hz at 10 kHz offset from a 10 GHz carrier  to be achieved.
A series of next-generation digital frequency discriminator
(DFD) and pulse frequency discriminator
receivers illustrate the direction of recent innovation.
Figure 5 illustrates the operation of this threshold estimator in a production 3.8- to 8.2-GHz digital frequency discriminator
The monotonic digital amplitude quantizer (MDAQ) provides a serial stream (one sample every 25 ns) of RF amplitude digital data to the standard video processor (SVP) and a limited RF input to the digital frequency discriminator
Attendees will see a digital frequency discriminator
at Northern Scientific Laboratory's booth.
Existing MTI radars have used this approach for years with analog feedback circuits that include an open-loop frequency discriminator
. The performance inaccuracies of these open-loop AFC circuits limit the clutter-rejection capabilities severely.