Phase-Locked Loop (PLL) Circuit

Product Specifications

Technical details and manufacturing context for Phase-Locked Loop (PLL) Circuit

Definition

A Phase-Locked Loop (PLL) Circuit is a critical component within a Clock Generator system, used to synchronize the phase and frequency of an output oscillator signal with a reference input signal. This synchronization enables precise clock generation, frequency synthesis, and signal recovery in electronic devices. The PLL operates by comparing the phase of a voltage-controlled oscillator (VCO) output with the input reference signal using a phase detector. Any phase difference generates an error voltage that is filtered and applied to the VCO, adjusting its frequency until the output phase locks to the reference phase, achieving synchronization.

Typical parameters for industrial-grade PLL ICs include a supply voltage range of 3.3–5.0 V DC, an input frequency range of 1–100 MHz, and an output frequency range of 1–200 MHz (extendable with dividers). Phase noise is typically -100 to -80 dBc/Hz at 10 kHz offset, and lock time ranges from 1 to 10 ms. The operating temperature range is -40 to 85 °C, with supply current between 5 and 50 mA. Output levels are CMOS or TTL compatible (0–3.3 V), and common packages include SOIC-8. ESD rating is 2–4 kV (HBM) per IEC 61340-3-1.

These values are directory reference ranges and must be confirmed for the specific model and application. The PLL is fabricated on semiconductor (silicon) material. It is used in applications requiring stable frequency synthesis, clock recovery, and phase alignment. When selecting a PLL, consider the required frequency ranges, phase noise performance, lock time, and environmental conditions. Verify all specifications with the legal manufacturer or supplier, as actual performance may vary. The PLL is a component, not a standalone system, and its operation depends on external components such as loop filters and dividers.

Working Principle

The PLL circuit compares the phase of a voltage-controlled oscillator (VCO) output with an input reference signal using a phase detector. Any phase difference generates an error voltage that is filtered and applied to the VCO, adjusting its frequency until the output phase locks to the reference phase, achieving synchronization. The loop filter determines the dynamic response, and the VCO frequency is controlled by the error voltage. Once locked, the output frequency is a multiple of the reference frequency, depending on the divider settings. The lock time is the time to achieve phase lock after a frequency change, typically 1–10 ms for industrial PLLs.

Common Materials

Semiconductor (Silicon)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	3.3–5.0 V DC	Operating range for typical PLL ICs
Input Frequency Range	1–100 MHz	Depends on PLL type and application
Output Frequency Range	1–200 MHz	Can be extended with dividers
Phase Noise	-100–-80 dBc/Hz @ 10 kHz offset	Lower is better for signal purity
Lock Time	1–10 ms	Time to achieve phase lock after frequency change
Operating Temperature Range	-40–85 °C	Industrial grade; extended ranges available
Supply Current	5–50 mA	Depends on output frequency and load
Output Level	0–3.3 V	CMOS or TTL compatible
Package Type	SOIC-8	Other packages available on request
ESD Rating	2–4 kV (HBM)	Human body modelIEC 61340-3-1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Phase Detector
Compares the phase difference between the reference input and the feedback signal, generating an error voltage proportional to the phase difference.

Material: semiconductor
Loop Filter Part
Filters the error voltage from the phase detector to remove high-frequency components and noise, providing a stable control voltage to the VCO.

Material: passive components (resistors, capacitors)
Voltage-Controlled Oscillator (VCO)
Generates the output signal whose frequency is controlled by the voltage from the loop filter.

Material: semiconductor
Frequency Divider
Divides the VCO output frequency to match the reference frequency, enabling frequency multiplication and synthesis (often part of the feedback path).

Material: semiconductor

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Clock Generator

View system integration details

Tracking Generator

View system integration details

Manufacturers of Phase-Locked Loop (PLL) Circuit

Manufacturer profiles associated with Phase-Locked Loop (PLL) Circuit.

Sourcing Phase-Locked Loop (PLL) Circuit from China?

Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.

Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Frequently Asked Questions

What is the typical supply voltage range for a PLL circuit?

The typical supply voltage range for industrial PLL ICs is 3.3–5.0 V DC. However, always check the datasheet of the specific model, as some devices may have different requirements.

How does a PLL achieve phase lock?

A PLL uses a phase detector to compare the phase of the VCO output with the reference input. The resulting error voltage is filtered and applied to the VCO, adjusting its frequency until the phase difference is minimized, achieving lock.

What is the lock time of a typical PLL?

Lock time is the time required to achieve phase lock after a frequency change. For typical industrial PLLs, this ranges from 1 to 10 ms, but it depends on the loop filter design and the frequency step.

What standards apply to PLL ESD ratings?

The ESD rating for PLLs is often specified per the human body model (HBM) and may reference standards such as IEC 61340-3-1. The typical range is 2–4 kV, but verify the specific model's compliance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Buyer enquiry

Request manufacturing insight for Phase-Locked Loop (PLL) Circuit

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes: Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here: We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman: CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim: A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

voltage:	1.8V to 5.5V (supply voltage range)
frequency:	1 MHz to 3 GHz (operating frequency range)
phase noise:	-100 dBc/Hz at 1 MHz offset (typical specification)
temperature:	-40°C to +125°C (typical industrial range)

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards