Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.
How to use a circuit diagram template.
- 01Choose your GNSS module and reference circuit
Select a module that fits your accuracy, power, and form‑factor requirements. Start with one of the example circuits for a fast track to a proven design.
- 02Configure power supply and backup
Add a clean LDO regulator, decoupling capacitors, and optionally a backup battery to maintain the real‑time clock and ephemeris data during power loss.
- 03Design the antenna interface
For active antennas, include a bias‑tee circuit with an inductor and DC blocking capacitor. For passive antennas, ensure a 50 Ω impedance‑controlled trace and proper grounding.
- 04Add necessary peripherals and connections
Wire UART/I²C/SPI communication lines, status LEDs, and optional external flash or sensors. Include ESD protection on external connectors.
- 05Generate and refine your schematic
Use the generator below to convert your design into a clean, reusable schematic. Tweak component values, net labels, and layout notes directly in the browser.
Questions about circuit diagram templates
Do I need an active or passive antenna for my GNSS module?
An active antenna (with a built‑in LNA) is recommended for modules with no internal LNA or when the antenna trace exceeds 50 mm. If the module has a built‑in LNA and the antenna is placed very close, a passive antenna can work.
Why does my GNSS module need a backup battery?
A backup battery (often a small rechargeable coin cell or supercapacitor) powers the RTC and preserves satellite ephemeris data during short power interruptions, enabling a warm or hot start that acquires a fix within seconds.
How do I bias an active GNSS antenna through the RF trace?
Use a bias‑tee circuit: connect the antenna feed to the module’s RF input through a DC‑blocking capacitor (e.g., 100 pF). Feed DC bias voltage (often 3.3 V or adjustable) through an RF inductor (e.g., 27 nH) from the module’s VANT pin or a dedicated LDO.
What are the critical layout considerations for a GNSS circuit?
Keep the RF trace as short as possible, maintain 50 Ω impedance, avoid stubs, and place the antenna connector close to the module. Isolate the RF section from noisy digital traces and use a solid ground plane underneath.