---
title: "Clock Data Recovery (CDR) Circuit"
industry: "Computer, Electronic and Optical Product Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:CLOCK_DATA_RECOVERY_CDR_CIRCUIT"
  data_integrity_hash: "d320eec874ec8291e93b989f81ced7fc"
  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_CIRCUIT"
  data_source_uri: "https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-circuit.md"
  official_resource_url: "https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-circuit"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "1.0-12.5 Gbps data rate, 0.5-2.0 Vpp input amplitude, -40 to 85°C ambient temperature"
    unit: "Gbps"
engineering_limits:
  max_safe_operating_point:
    value: 0.15
    unit: "UI"
    consequence: "Phase-locked loop (PLL) bandwidth reduction below 1 MHz due to charge pump current mismatch exceeding 5%, causing insufficient phase margin below 45° at 10 GHz operation"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Power supply noise exceeding 50 mVpp at 100 MHz"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "On-chip low-dropout regulator with 30 dB power supply rejection ratio at 100 MHz and dedicated analog ground plane"
  - node_2:
      trigger: "Temperature gradient of 15°C/mm across die"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Proportional-to-absolute-temperature (PTAT) bias current generation and symmetrical layout with thermal guard rings"
bom_nodes:
  phase-detector:
    type: "part"
    urn: "URN:CNFX:ME:PHASE_DETECTOR"
    interface_type: "physical-logic-coupled"
  voltage-controlled-oscillator-vco-or-digitally-controlled-oscillator-dco:
    type: "part"
    urn: "URN:CNFX:ME:VOLTAGE_CONTROLLED_OSCILLATOR_VCO_OR_DIGITALLY_CONTROLLED_OSCILLATOR_DCO"
    interface_type: "physical-logic-coupled"
  loop-filter:
    type: "component"
    urn: "URN:CNFX:ME:LOOP_FILTER"
    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-circuit.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "780705b980dfada8a6d15e303680c6e30971a343310763471dad0b09f636f825"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Clock Data Recovery (CDR) Circuit

## 1. Technical Definition
A circuit that extracts timing information from a data stream to synchronize the receiver's clock with the transmitter's clock.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **1.0-12.5 Gbps data rate, 0.5-2.0 Vpp input amplitude, -40 to 85°C ambient temperature**. Failure boundary: **Phase error exceeds 0.15 UI (Unit Interval), jitter tolerance falls below 0.3 UIpp, lock time exceeds 100 μs**, Mechanism: **Phase-locked loop (PLL) bandwidth reduction below 1 MHz due to charge pump current mismatch exceeding 5%, causing insufficient phase margin below 45° at 10 GHz operation**.

### 2.1 Analytical Physics Model
Governed by the **Joule Heating & Thermal Resistance**:

> **Primary Equation**: $P = I^2 R = \frac{V^2}{R}$  
> **Engineering Impact**: Governs heating element sizing for shrink tunnels/sealers.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| I | Current | Engineering Constant |
| R | Resistance | Engineering Constant |
| V | Voltage | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Power supply noise exceeding 50 mVpp at 100 MHz | 8 | Phase detector metastability causing bit error rate degradation above 10^-12 | On-chip low-dropout regulator with 30 dB power supply rejection ratio at 100 MHz and dedicated analog ground plane |
| Temperature gradient of 15°C/mm across die | 8 | Voltage-controlled oscillator frequency drift exceeding ±500 ppm | Proportional-to-absolute-temperature (PTAT) bias current generation and symmetrical layout with thermal guard rings |

## 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)`
- [Voltage-Controlled Oscillator (VCO) or Digitally Controlled Oscillator (DCO)](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/voltage-controlled-oscillator-vco-or-digitally-controlled-oscillator-dco.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Semiconductor Wafer Prober**, **Automatic Test Equipment (ATE)**, **Clean Room Environmental Control System**  
**Downstream Applications**: High-Speed Network Switches, Optical Transceivers, Data Center Server Motherboards  

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

### Q: What is the primary function of a Clock Data Recovery (CDR) circuit?
**A**: A CDR circuit extracts timing information from incoming data streams to synchronize the receiver's clock with the transmitter's clock, ensuring accurate data sampling and reducing bit errors in high-speed communication systems.

### Q: What are the key components in a typical CDR circuit BOM?
**A**: The essential components include a Phase Detector to compare input/output phases, a Loop Filter to smooth control signals, and a Voltage-Controlled Oscillator (VCO) or Digitally Controlled Oscillator (DCO) to generate the synchronized clock signal.

### Q: In which applications are CDR circuits most critical?
**A**: CDR circuits are vital in optical communication systems, high-speed data transmission (Ethernet, PCIe), serial communication interfaces, and any application requiring precise clock synchronization from embedded data streams without separate clock signals.

## 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) Circuit](https://cnfx.com/industry/computer-electronic-and-optical-product-manufacturing/product/clock-data-recovery-cdr-circuit)**

### 🌐 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_CIRCUIT | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: c96ae9ef
