Quad switched gain circuit
Quadrature offset power amplifier
Quadrature output low noise transconductance amplifier...
Quasi-complementary class B IC output stage
Quasi-linear amplifier with feedback-controlled idling currents
Quiescent biasing of r-f power transistors for other than class
Quiescent current control for the output stage of an amplifier
Quiescent current setting for an amplifier circuit