Sense Electrodes: Capacitance Range 10 fF to 1 pF

Q: What is the main function of sense electrodes in gyroscopes?

Sense electrodes detect minute displacements of proof masses caused by Coriolis forces during rotation, converting mechanical motion into measurable electrical signals through capacitance changes.

Q: Why are sense electrodes arranged in differential pairs?

Differential electrode arrangements cancel common-mode noise and environmental disturbances (like temperature variations), improving signal-to-noise ratio and measurement accuracy.

Q: How do manufacturing tolerances affect sense electrode performance?

Sub-micron variations in electrode gap or alignment can cause capacitance mismatches up to 10%, leading to offset errors and reduced sensitivity that require electronic trimming or calibration.

Component Specifications

Definition

Sense electrodes are critical components in MEMS (Micro-Electro-Mechanical Systems) gyroscopes that function as capacitive plates to detect Coriolis-induced displacement. These electrodes are typically arranged in comb-drive configurations adjacent to proof masses, converting mechanical motion into measurable electrical signals through changes in capacitance. They operate in vacuum-sealed cavities to minimize damping and maximize sensitivity to rotational movement.

Working Principle

Sense electrodes work on the principle of capacitive sensing. When the gyroscope rotates, Coriolis forces cause proof masses to displace perpendicular to both the drive and rotation axes. This displacement changes the gap between stationary sense electrodes and moving structures, altering capacitance. Differential capacitance measurements between electrode pairs are then converted to voltage signals proportional to angular velocity through charge amplifiers or transimpedance circuits.

Materials

Typically made from doped polysilicon (resistivity: 0.001-0.02 Ω·cm) or single-crystal silicon with gold or aluminum metallization (thickness: 0.5-2 μm). Dielectric layers use silicon dioxide (SiO₂) or silicon nitride (Si₃N₄) with breakdown voltages >100 V/μm. Some high-performance versions use platinum-iridium alloys for enhanced stability.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Noise Floor	<0.01 °/s/√Hz
Sensitivity	5-20 mV/°/s
Gap Distance	1-5 μm
Electrode Area	100×100 μm² to 500×500 μm²
Capacitance Range	10 fF to 1 pF
Operating Voltage	1.8-5 V DC
Temperature Range	-40°C to +85°C
Resonant Frequency	10-40 kHz

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 16063-21, IEC 60747-14-1, MIL-STD-883

Parent Products

This component is used in the following industrial products

Gyroscope

A gyroscope is a motion sensor component used in computer, electronic, and optical product manufacturing.

View Product Details

Triaxial Gyroscope

The triaxial gyroscope is a component used in the manufacturing of computer, electronic, and optical products.

View Product Details

Gyroscopic Sensor

This gyroscopic sensor is a component used in computer, electronic, and optical product manufacturing.

View Product Details

Engineering Analysis

Risks & Mitigation

Capacitance drift due to temperature changes
Stiction causing permanent electrode contact
Charge accumulation leading to measurement errors
Mechanical fatigue from vibration
Contamination affecting dielectric properties

FMEA Triads

Trigger: Electrode stiction due to moisture or Van der Waals forces
Failure: Permanent adhesion between electrodes and proof mass
Mitigation: Apply anti-stiction coatings (SAMs), maintain cleanroom assembly, implement release hole designs

Trigger: Thermal expansion mismatch between materials
Failure: Capacitance drift exceeding 5% over temperature range
Mitigation: Use matched CTE materials, implement temperature compensation algorithms, design symmetric structures

Trigger: Electrostatic discharge during handling
Failure: Dielectric breakdown causing short circuits
Mitigation: Incorporate ESD protection diodes, follow proper handling procedures, use conductive packaging

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Gap uniformity: ±0.1 μm, Electrode alignment: ±0.2 μm, Surface roughness: <10 nm Ra

Test Method

Capacitance-voltage (C-V) measurements, Laser Doppler vibrometry for displacement verification, Thermal cycling tests (-40°C to +125°C), Vibration testing per MIL-STD-810

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

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Sense Electrodes

Manufacturer profiles associated with Sense Electrodes.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the main function of sense electrodes in gyroscopes?

Sense electrodes detect minute displacements of proof masses caused by Coriolis forces during rotation, converting mechanical motion into measurable electrical signals through capacitance changes.

Why are sense electrodes arranged in differential pairs?

Differential electrode arrangements cancel common-mode noise and environmental disturbances (like temperature variations), improving signal-to-noise ratio and measurement accuracy.

How do manufacturing tolerances affect sense electrode performance?

Sub-micron variations in electrode gap or alignment can cause capacitance mismatches up to 10%, leading to offset errors and reduced sensitivity that require electronic trimming or calibration.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sense Electrodes

Component Specifications

Parent Products

Gyroscope

Triaxial Gyroscope

Gyroscopic Sensor

Engineering Analysis

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Procurement Evaluation Criteria

Manufacturers of Sense Electrodes

Related Components

Frequently Asked Questions

What is the main function of sense electrodes in gyroscopes?

Why are sense electrodes arranged in differential pairs?

How do manufacturing tolerances affect sense electrode performance?

Data Basis

Request Manufacturing Insight for Sense Electrodes