Fast set low-power bias unit and method for single-end circuit
A technology of circuit and bias circuit, which is applied in the parts of amplifying devices, electrical components, low-noise amplifiers, etc., can solve the problems of slow turn-on time, increased cost, and poor RF performance, and achieve short turn-on time, Effect of eliminating up-conversion noise
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[0025] The proposed biasing device 300 and technique, as image 3 shown, can be implemented in a wide variety of single-ended circuits. A single-ended circuit such as an LNA (300) according to the present invention includes an input power matching circuit (310) and an output transistor (Q in ) of a bias circuit (305). Regenerative inductance (L e ) and load impedance (L o ) are coupled to the output transistors (Q i n) emitter and collector.
[0026] The bias circuit (305) is configured to cancel the output transistor (Q in ) base shot noise. The biasing circuit (305) according to the present invention also eliminates the biasing resistor (R x1 ) noise. Specifically, the bias circuit (305) includes a current reference source (I ref ) and emitter follower circuit (315), both connected to the current mirror circuit (Q 1 , Q 2 , R x2 ), the mirror circuit is connected to the bias resistor (R x1 ). The bias circuit (305) can be implemented in a wide variety of single...
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