Feedback Divider Component for PLL Frequency Synthesis

Product Specifications

Technical details and manufacturing context for Feedback Divider

Definition

The Feedback Divider is a critical electronic component embedded within frequency divider or multiplier circuits. Its primary function is to monitor the output frequency, divide it by a specific integer (N), and feed this divided signal back to the phase comparator or control logic. This feedback loop is essential for phase-locked loop (PLL) operation, enabling precise frequency synthesis, clock generation, and signal stabilization by comparing the feedback signal with a stable reference frequency. The component is typically implemented in silicon semiconductor technology, with copper interconnects and silicon dioxide insulation. It operates over an input frequency range of 10–6000 MHz, with a programmable division ratio from 1 to 256, resulting in an output frequency range of 0.039–6000 MHz. The supply voltage is 3.3–5 V, with a supply current of 5–20 mA (typical 10 mA at 3.3 V). Output power is -5 to 0 dBm into a 50-ohm load, and phase noise is -150 to -140 dBc/Hz at 100 kHz offset from a 1 GHz carrier. The operating temperature range is -40 to 85 °C, with input and output impedances matched to 50 ohms. The component is available in a QFN-24 package (5x5 mm, 0.5 mm pitch) and weighs 0.5–1.0 g. These values are directory reference ranges; for specific models, verify with the manufacturer. The Feedback Divider is used in applications such as frequency synthesizers, clock generators, and communication systems where precise frequency control is required. It is a part-level component, not a standalone product, and must be integrated into a larger circuit. For procurement, confirm the exact specifications and standards with the legal manufacturer or supplier.

Working Principle

The Feedback Divider operates by receiving the high-frequency output signal from the Voltage-Controlled Oscillator (VCO). It divides this frequency by a programmable integer value (N) using digital counters (e.g., flip-flops in a ripple counter or synchronous counter configuration). The resulting lower-frequency signal is then fed back to the phase detector. The phase detector compares this feedback signal's phase and frequency with a reference signal. Any difference generates an error voltage that adjusts the VCO, forcing the output frequency to be exactly N times the reference frequency, thus locking the system. The division ratio is set via external control bits, allowing flexibility in the output frequency. The component's input and output are matched to 50 ohms, and it operates over a wide frequency range, making it suitable for various PLL applications. The feedback loop ensures stability and precision, but the component must be used within its specified voltage, temperature, and frequency limits to avoid malfunction.

Common Materials

Silicon (Semiconductor), Copper (Interconnects), Silicon Dioxide (Insulation)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Input Frequency Range	10–6000 MHz	Wider range requires additional prescaler stages.
Division Ratio Range	1–256	Programmable via external control bits.
Output Frequency Range	0.039–6000 MHz	Depends on division ratio.
Supply Voltage	3.3–5 V	Outside range may cause malfunction.
Supply Current	5–20 mA	At 3.3 V, typical 10 mA.
Output Power	-5–0 dBm	Into 50 ohm load.
Phase Noise	-150–-140 dBc/Hz	At 100 kHz offset, 1 GHz carrier.
Operating Temperature Range	-40–85 °C	Extended temp versions available.
Input Impedance	50 Ω	Matched to 50 ohm system.
Output Impedance	50 Ω	Matched to 50 ohm system.
Package Type	QFN-24	5x5 mm, 0.5 mm pitch.
Weight	0.5–1.0 g	Including package.

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

Digital Counter
Performs the integer division operation on the input clock signal. Typically built from a cascade of flip-flops.

Material: Silicon (CMOS transistors)
Control Register Part
Stores the programmable division ratio (N) value, often set via a serial or parallel interface.

Material: Silicon (CMOS logic gates)
Input Buffer
Conditions the high-frequency input signal from the VCO to appropriate logic levels for the counter.

Material: Silicon (CMOS/BiCMOS transistors)
Output Driver
Buffers the divided low-frequency signal to drive the phase detector input.

Material: Silicon (CMOS transistors)

Applied To / Applications

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

Frequency Divider/Multiplier

View system integration details

Manufacturers of Feedback Divider

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Frequently Asked Questions

What is the primary function of a Feedback Divider?

The Feedback Divider samples the output frequency of a VCO, divides it by an integer N, and feeds the divided signal back to the phase detector in a PLL. This feedback loop stabilizes the output frequency to N times the reference frequency.

What are the typical input and output frequency ranges?

The input frequency range is 10–6000 MHz, and the output frequency range is 0.039–6000 MHz, depending on the division ratio (1–256). These are directory reference ranges; confirm with the manufacturer for specific models.

What is the operating temperature range?

The operating temperature range is -40 to 85 °C. Extended temperature versions may be available, but this must be verified with the supplier.

What package is available?

The component is available in a QFN-24 package with dimensions 5x5 mm and 0.5 mm pitch. The weight is 0.5–1.0 g including package. Confirm exact package details with the manufacturer.

Data Basis

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

Preliminary Technical Classification

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pressure:	Not applicable (electronic component)
other spec:	Frequency range: 10 MHz to 2.4 GHz, Power handling: -10 dBm to +20 dBm, Supply voltage: 3.3V ±10%
temperature:	-40°C to +85°C

Feedback Divider

Product Specifications

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