Phase-Frequency Detector (PFD)

Product Specifications

Technical details and manufacturing context for Phase-Frequency Detector (PFD)

Definition

A Phase-Frequency Detector (PFD) is a critical component within a Phase-Locked Loop (PLL) frequency synthesizer, which is part of a Local Oscillator (LO) system. Its primary function is to compare a reference signal with a feedback signal from a Voltage-Controlled Oscillator (VCO). It detects both phase and frequency differences, producing an output (typically UP or DOWN pulses) that drives a charge pump and loop filter to adjust the VCO frequency until the two input signals are synchronized in phase and frequency. The PFD operates over a frequency range of 10–1000 MHz, with a supply voltage of 3.3–5.0 V, and consumes 10–50 mW at maximum frequency and supply voltage. It provides a phase detection range of -180° to 180° with an accuracy of ±1° at nominal conditions. The input signal level should be 0.8–2.0 Vpp, and the output logic level is CMOS compatible (0–3.3 V). The operating temperature range is -40°C to 85°C (IEC 60068-2-1), storage temperature range is -55°C to 125°C (IEC 60068-2-2), and relative humidity range is 5–95% RH non-condensing (IEC 60068-2-78). The typical package is QFN-16 (JEDEC MO-220), with a weight of 0.5–1.0 g depending on package variant. The PFD is fabricated on semiconductor (silicon) material. These parameters are directory reference ranges and must be confirmed for the specific model and application with the legal manufacturer or supplier. The PFD is essential for frequency synthesis in communication systems, where precise phase and frequency locking is required.

Working Principle

The PFD operates by receiving two periodic input signals: a reference signal and a feedback signal. It uses sequential logic (often implemented with D-type flip-flops) to generate two output signals. If the reference signal leads the feedback signal, an UP pulse is generated. If the feedback signal leads, a DOWN pulse is generated. The width of these pulses is proportional to the phase difference. When the frequencies differ, it generates a continuous stream of pulses to drive the frequency correction. The outputs are typically reset when both inputs are high, preventing a dead zone.

Common Materials

Semiconductor (Silicon)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Frequency Range	10–1000 MHz	Beyond this range, phase detection accuracy degrades.
Supply Voltage	3.3–5.0 V	Outside this range, internal logic may malfunction.
Power Consumption	10–50 mW	At maximum frequency and supply voltage.
Phase Detection Range	-180–180 deg	Full cycle coverage.
Phase Detection Accuracy	±1 deg	At nominal conditions.
Input Signal Level	0.8–2.0 Vpp	Below 0.8 Vpp may not trigger correctly.
Output Logic Level	0–3.3 V	CMOS compatible.
Operating Temperature Range	-40–85 °C	Extended range available on request.IEC 60068-2-1
Storage Temperature Range	-55–125 °C	Non-operating.IEC 60068-2-2
Relative Humidity	5–95 % RH	Non-condensing.IEC 60068-2-78
Package Type	QFN-16	Other packages available.JEDEC MO-220
Weight	0.5–1.0 g	Depends on package variant.

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

D-Type Flip-Flops
Core sequential logic elements that latch the state of the input signals to generate the UP and DOWN control signals.

Material: Semiconductor (Silicon)
AND Gate (Reset Logic) Part
Resets the flip-flops when both outputs are high, completing the comparison cycle and preventing a dead zone.

Material: Semiconductor (Silicon)
Output Drivers/Buffers Part
Amplify the logic-level UP/DOWN signals to drive the subsequent charge pump circuit effectively.

Material: Semiconductor (Silicon)

Applied To / Applications

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

Local Oscillator (LO) / Synthesizer

View system integration details

Manufacturers of Phase-Frequency Detector (PFD)

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Frequently Asked Questions

What is the operating frequency range of this PFD?

The directory reference range is 10–1000 MHz. However, you must verify the exact range for the specific model with the manufacturer, as performance may vary.

What supply voltage does the PFD require?

The reference supply voltage range is 3.3–5.0 V. Confirm the required voltage for your application with the supplier, as operation outside this range may cause malfunction.

What is the phase detection accuracy?

The phase detection accuracy is ±1° at nominal conditions. This value is a reference; actual accuracy depends on operating conditions and must be verified.

What standards are referenced for temperature and humidity?

The operating temperature range references IEC 60068-2-1, storage temperature references IEC 60068-2-2, and relative humidity references IEC 60068-2-78. These standards are for verification purposes and do not imply certification.

Data Basis

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

Preliminary Technical Classification

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voltage:	1.8V to 5.5V (supply voltage range)
frequency:	DC to 500 MHz (operating frequency range)
temperature:	-40°C to +125°C (typical industrial range)
phase offset:	±2π radians (full range detection)

Product Specifications

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