A low noise amplifier with automatically Q-tuned notch filter
A low noise amplifier with automatically Q-tuned notch filter is proposed. The automatic Q tuning is achieved by an analog-digital mixed circuit, in which the successive approximation register algorithm is used to search for the appropriate current value through the resonator so that the losses of the resonator are perfectly cancelled to get a deep notch.
low noise amplifier image rejection filter automatic-q tuning