AND Gate (Reset Logic): Power Consumption < 10 mW

Q: What is the purpose of the AND Gate in PFD reset logic?

The AND Gate ensures that the PFD only resets when both UP and DOWN signals are active, creating a controlled dead zone that prevents false triggering and maintains linear phase detection characteristics.

Q: How does the AND Gate affect PLL performance?

Proper AND Gate implementation eliminates dead zones in the PFD transfer function, reduces phase noise, and improves PLL lock time and stability by ensuring precise reset timing.

Q: Can different logic families be used for the AND Gate in PFD?

Yes, but CMOS is preferred for low power consumption and good noise immunity. TTL can be used but may require level shifting. The choice affects propagation delay and power characteristics.

Component Specifications

Definition

The AND Gate (Reset Logic) is a critical digital logic component within Phase-Frequency Detector (PFD) circuits, specifically designed to implement the reset function. It receives multiple input signals (typically from the PFD's UP and DOWN outputs) and generates a reset pulse only when all input conditions are simultaneously satisfied. This ensures precise timing synchronization between phase and frequency comparisons, preventing false resets and maintaining stable PLL (Phase-Locked Loop) operation.

Working Principle

The AND Gate operates on Boolean logic principles where the output is HIGH (logic 1) only when all inputs are HIGH simultaneously. In PFD applications, it monitors the UP and DOWN signals from the phase comparator. When both signals become active (indicating a phase difference has been detected and processed), the AND gate outputs a reset pulse that clears the PFD's internal state, allowing it to begin the next comparison cycle. A deliberate delay is normally inserted in this reset path so that both outputs stay active briefly on every cycle, which removes the dead zone - the non-linear region near zero phase error that would otherwise cause jitter - and keeps the PFD linear.

Materials

Semiconductor materials (typically silicon), with CMOS or TTL technology implementations. Package materials include ceramic or plastic encapsulation with gold or copper lead frames.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Package Type	SOIC-14, TSSOP-14
Supply Voltage	3.3V or 5V
Power Consumption	< 10 mW
Propagation Delay	1-5 ns
Input Logic Levels	CMOS/TTL compatible
Operating Temperature	-40°C to +85°C

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

Standards

IEC 60747, JEDEC JESD78

Parent Products

This component is used in the following industrial products

Phase-Frequency Detector (PFD)

A circuit that compares the phase and frequency of two input signals and generates an output signal proportional to their difference.

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Engineering Analysis

Risks & Mitigation

Timing violations causing PLL instability
Signal propagation delays affecting reset accuracy
Power supply noise inducing false resets
ESD damage during handling

FMEA Triads

Trigger: Excessive propagation delay
Failure: Missed reset pulses causing PFD deadlock
Mitigation: Use high-speed logic families with verified timing margins

Trigger: Input signal skew
Failure: Premature or delayed resets affecting PLL lock
Mitigation: Implement matched delay paths and proper PCB layout techniques

Trigger: Power supply fluctuations
Failure: False reset triggering
Mitigation: Add decoupling capacitors and voltage regulation

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5 ns propagation delay tolerance, ±5% voltage threshold variation

Test Method

JEDEC JESD78 latch-up test, IEC 61000-4-2 ESD test, functional testing with pulse generators and oscilloscopes

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

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Manufacturing capability

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Inspection readiness

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Manufacturers of AND Gate (Reset Logic)

Manufacturer profiles associated with AND Gate (Reset Logic).

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Frequently Asked Questions

What is the purpose of the AND Gate in PFD reset logic?