---
title: "Clock Data Recovery (CDR) Unit"
industry: "Computer, Electronic and Optical Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CLOCK_DATA_RECOVERY_CDR_UNIT"
  data_integrity_hash: "9652b6dad36c1d874c03a699577988cd"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:CLOCK_DATA_RECOVERY_CDR_UNIT"
  data_source_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-unit.md"
  official_resource_url: "https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-unit"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0.5-10 Gbps data rate, 1-1000 ppm frequency offset tolerance, -40°C to 85°C ambient temperature"
    unit: "Gbps"
engineering_limits:
  max_safe_operating_point:
    value: 1000
    unit: "ppm"
    consequence: "Phase detector dead zone causing metastability, voltage-controlled oscillator (VCO) gain nonlinearity beyond 500 MHz/V, charge pump current mismatch exceeding 5%"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Power supply noise with &gt;50 mVpp ripple at 100 kHz-10 MHz"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "On-chip low-dropout regulator with 30 dB power supply rejection ratio (PSRR) at 1 MHz"
  - node_2:
      trigger: "Temperature gradient &gt;10°C/mm across die causing 0.3 ps/K VCO frequency drift"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Distributed VCO architecture with 5-point thermal sensors and 0.1%/°C compensation loop"
bom_nodes:
  phase-detector:
    type: "part"
    urn: "URN:CNFX:ME:PHASE_DETECTOR"
    interface_type: "physical-logic-coupled"
  loop-filter:
    type: "part"
    urn: "URN:CNFX:ME:LOOP_FILTER"
    interface_type: "physical-logic-coupled"
  voltage-controlled-oscillator-vco:
    type: "part"
    urn: "URN:CNFX:ME:VOLTAGE_CONTROLLED_OSCILLATOR_VCO"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING (EU DIRECTIVE 2014/35/EU LOW VOLTAGE DIRECTIVE)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-unit.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "b17bc61b05c2a5a68165ae38b6ec71a27341000e9b95e0e2b33d2642b39e79b1"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Clock Data Recovery (CDR) Unit

## 1. Technical Definition
Electronic circuit that extracts timing information from data streams to synchronize receiver with transmitter.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0.5-10 Gbps data rate, 1-1000 ppm frequency offset tolerance, -40°C to 85°C ambient temperature**. Failure boundary: **Phase-locked loop (PLL) loses lock at &gt;1000 ppm frequency offset, jitter tolerance exceeds 0.15 UI peak-to-peak, supply voltage drops below 0.9V nominal**, Mechanism: **Phase detector dead zone causing metastability, voltage-controlled oscillator (VCO) gain nonlinearity beyond 500 MHz/V, charge pump current mismatch exceeding 5%**.

### 2.1 Analytical Physics Model
Governed by the **Rayleigh Resolution Criterion**:

> **Primary Equation**: $d = \frac{0.61 \lambda}{NA}$  
> **Engineering Impact**: Defines the theoretical limit of machine vision systems.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| \lambda | Wavelength | Engineering Constant |
| NA | Numerical Aperture | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Power supply noise with &gt;50 mVpp ripple at 100 kHz-10 MHz | 8 | Increased bit error rate (BER) from 10^-12 to 10^-6 due to jitter amplification | On-chip low-dropout regulator with 30 dB power supply rejection ratio (PSRR) at 1 MHz |
| Temperature gradient &gt;10°C/mm across die causing 0.3 ps/K VCO frequency drift | 8 | Clock-data misalignment exceeding 0.25 UI causing synchronization loss | Distributed VCO architecture with 5-point thermal sensors and 0.1%/°C compensation loop |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | Gbps | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Phase Detector](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/phase-detector.md) `(Standalone System)`
- [Loop Filter](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/loop-filter.md) `(Standalone System)`
- [Voltage-Controlled Oscillator (VCO)](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/voltage-controlled-oscillator-vco.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Signal Generator**, **Oscilloscope**, **Network Analyzer**  
**Downstream Applications**: High-Speed Network Switches, Optical Transceivers, Data Center Servers  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the primary function of a Clock Data Recovery (CDR) unit?
**A**: The CDR unit extracts timing information from incoming data streams to synchronize the receiver's clock with the transmitter's clock, ensuring accurate data recovery and minimizing errors in communication systems.

### Q: What are the key components in a CDR unit's Bill of Materials (BOM)?
**A**: The essential components include a Phase Detector to compare input signal phases, a Loop Filter to smooth the phase error signal, and a Voltage-Controlled Oscillator (VCO) to adjust the clock frequency based on the filtered signal.

### Q: How does a CDR unit benefit computer and optical product manufacturing?
**A**: It enables high-speed data transmission with reduced jitter and bit errors, critical for applications like fiber-optic networks, data centers, and electronic devices, improving reliability and performance in optical and electronic systems.

## 6. Manufacturing Compliance
- ISO 9001:2015 QUALITY MANAGEMENT SYSTEMS
- CE MARKING (EU DIRECTIVE 2014/35/EU LOW VOLTAGE DIRECTIVE)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Clock Data Recovery (CDR) Unit](https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-unit)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: CLOCK_DATA_RECOVERY_CDR_UNIT | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 08873a19
