I want to use the WM8978 chip to make a digital phone. During the test of the selected phone handle, I found a problem, that is, I can hear my own voice in the receiver. I searched for information and
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Do you know the formula for 1/4 wavelength radio frequency: wavelength (antenna) = (300/f) * 0.25 * 0.96? Does this F refer to a fixed frequency? Now my frequency is 925MHZ to 2175MHZ. How should I se
1. Use VNA to measure the series equivalent parameters L, R and C of the antenna; 2. Increase the sweep range to find an intersection; 3. Increase the filter capacitance and move the intersection up.
The automotive environment is very demanding for electronics: any circuit connected to the 12V supply must operate within the nominal voltage range of 9V to 16V, and other pressing issues include load