PLL

Group: Baseband > Demodulation

Phase locked loop.

Parameters

Sample rate

• Description: Sample rate of the input signal
• Automation reference: SampleRate
• Unit: Hz
• Type: real

Loop bandwidth

• Description: Bandwidth used for the loopfilter
• Automation reference: LoopBandwidth
• Unit: Hz
• Type: real

Pre-translation

• Description: Amount to translate the signal before phase locking. With a pre-translation of +4 Hz, a signal at +10 Hz would end up at +6 Hz after pre-translation.
• Automation reference: PreTranslation
• Unit: Hz
• Type: real

Output type

• Description: Type of the output from the PLL
• Automation reference: OutputType
• Type: enumeration

Identifier	Value	Description
Complex	Complex output	The original signal with the carrier removed.
Angle	Angle	Performs perfect phase demodulation. Resistant to amplitude variations.
Imaginary	Imaginary	Outputs the imaginary component which approximates the phase of the signal. Amplitude variations will be linearly coupled to this.
AngleBPSK	Fake BPSK (Angle)	Performs perfect phase demodulation. Resistant to amplitude variations. Output is formatted as complex data.

Invert output

• Description: Allows flipping the sign of the output
• Automation reference: InvertOutput
• Enablement: outputType in [Angle, Imaginary]
• Type: boolean

Lock threshold

• Description: Threshold value to use for the lock detector
• Automation reference: LockThreshold
• Type: real

Error detector

• Description: Error function used in the PLL
• Automation reference: ErrorDetector
• Type: enumeration

Identifier	Value	Description
Angle	Angle	Uses the angular error with atan2. Removes uncertainty for signals without any noise.
Imaginary	Imaginary	Uses the imaginary component of the output. Might be less precise but is resistant to amplitude modulation.

Measurements

Carrier offset

• Description: The instantaneous frequency of the detected carrier offset.
• Unit: Hz
• Automation reference: CarrierOffset
• Type: real

Lock indication

• Description: Estimate of how likely the PLL is to be locked on to a carrier
• Automation reference: LockIndication
• Type: real

Lock

• Description: True if the lock indicator is above the configured threshold
• Automation reference: Lock
• Type: boolean