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RF testing of Bluetooth devices
Nov 11, 2017

For Bluetooth devices, the RF part is one of the main tests.

Bluetooth radio  designs use a variety of system architectures, ranging from traditional  analog to IF-based systems to systems based on digital IQ modulator /  demodulator configurations,  regardless of the design configuration  used, the product development process must  solve the following problems:

· Global regulatory requirements
· Bluetooth certification
· Simple and efficient manufacturing test
· Good compatibility with other manufacturers' products

Here are some of the tests that apply to the RF part of a Bluetooth device:

Power:The output amplifier is an option, with this option undoubtedly boosting the output  power of a Class I (+20 dBm) output amplifier.

Frequency Error:All frequency measurements in the Bluetooth specification select short 4 microseconds  or 10 microsecond gating cycles, which can cause uncertainty in the  measurement results.

Frequency Drift: Drift measurements combine short, 10-bit neighbor data sets with longer drift results across the pulse. This error can occur if a sample-and-hold design is used in the transmitter design.

Inband Spectrum: The 20dB test confirms that the modulated and pulsed signals are indeed in the 1MHz band.

Out-band spectrum: Frequency  doubling is a technique commonly used to prevent RF from pulling back to the center frequency by coupling back to the VCO, eliminating the need  for secondary harmonics in the RF output path, especially when they may  compromise the relevant site, such as GPS with an L2 frequency of  1,222.7 MHz Receiver or cellular wireless device functionality.

Test receiver hopping: As mentioned,  all Bluetooth components use a simple local oscillator with a sideband  effect of less than 300 microseconds across the entire tuning range,  which is also inevitable when the device is operating in Bluetooth test  mode one effect.

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