Capture Register (e.g., D Flip-Flops): Bit Width 8 to 32 bits

Q: What is the difference between a capture register and a regular register in TDC systems?

Capture registers are specifically designed for timing applications with optimized setup/hold times and minimal propagation delays, while regular registers are general-purpose storage elements. Capture registers in TDCs often include metastability hardening and are synchronized with high-precision clock domains.

Q: How does the capture register achieve picosecond resolution in TDCs?

Through a combination of high-speed clocking (multiple GHz), vernier delay lines, wave union techniques, and careful timing optimization of the flip-flop elements. The register captures the state of these timing circuits at the exact event moment.

Q: Can capture registers be used in other applications besides TDCs?

Yes, they are also used in digital oscilloscopes, time interval counters, laser ranging systems, and particle physics experiments where precise time stamping is required.

Component Specifications

Definition

A capture register, typically implemented using D flip-flops or latches, is a critical component in Time-to-Digital Converters (TDCs) that stores digital values representing the timing of input events. It operates by sampling the state of timing signals at specific clock edges, converting analog time intervals into discrete digital codes with resolution determined by the system's clock frequency and architecture. In TDC applications, these registers provide temporary storage for time measurements before further processing or readout.

Working Principle

The capture register works by using clocked D flip-flops to sample and hold the logic state of timing signals. When an event triggers the TDC, the register captures the current value of a high-speed counter or delay line output at the precise moment of the event. This frozen digital value represents the time stamp of the event relative to a reference clock. The register maintains this value until read by the system's control logic, enabling precise time interval measurements with resolutions down to picoseconds in advanced TDC implementations.

Materials

Semiconductor materials (typically silicon), with metal interconnects (copper or aluminum) and dielectric insulation. Manufactured using CMOS, BiCMOS, or specialized high-speed semiconductor processes.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bit Width	8 to 32 bits
Hold Time	< 30 ps
Resolution	1 ps to 100 ps
Setup Time	< 50 ps
Sampling Rate	Up to 10 GS/s
Operating Voltage	1.2V to 3.3V
Power Consumption	1-100 mW per channel
Propagation Delay	< 100 ps
Temperature Range	-40°C to +125°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

ISO 9001, IEC 60747, JEDEC JESD, MIL-STD-883

Parent Products

This component is used in the following industrial products

Time-to-Digital Converter (TDC)

An electronic circuit that converts a time interval between two events into a digital number.

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Engineering Analysis

Risks & Mitigation

Timing violations causing metastability
Clock skew affecting measurement accuracy
Power supply noise inducing jitter
Temperature variations altering propagation delays
Single-event upsets in radiation environments

FMEA Triads

Trigger: Clock signal integrity issues
Failure: Incorrect time capture due to setup/hold violations
Mitigation: Implement clock tree synthesis with balanced routing, use low-jitter clock sources, add timing margin in design

Trigger: Power supply fluctuations
Failure: Increased jitter and reduced timing resolution
Mitigation: Use dedicated voltage regulators, implement power supply filtering, design with low-power modes

Trigger: Temperature variations
Failure: Drift in propagation delays affecting calibration
Mitigation: Implement temperature compensation circuits, use materials with low thermal coefficients, include on-chip temperature sensors

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% of full-scale time measurement, ±2σ timing jitter specification

Test Method

IEEE Std 181-2011 (Transition Time), JESD65B (Timing Measurements), characterized using precision pulse generators and sampling oscilloscopes with <1 ps resolution

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

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Inspection readiness

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Manufacturers of Capture Register (e.g., D Flip-Flops)

Manufacturer profiles associated with Capture Register (e.g., D Flip-Flops).

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Frequently Asked Questions

What is the difference between a capture register and a regular register in TDC systems?