KEY POWER AMPLIFIER Russian patent published in 2010 - IPC H03F3/193 

FIELD: radio engineering.

SUBSTANCE: key power amplifier comprises active key element, serial capacitor (C₁), parallel LC₂R-circuit with active load (R) and source of supply voltage (V_ds) with throttle (Th) for isolation of high-frequency circuits by supply. Inlet of active key element is inlet of device. Outlet of active key element is connected to serial capacitor C₁, which on one side through Th is connected to source V_ds on the other side is connected to common point of parallel LC₂R-circuit, which in its turn is outlet of device. Common point of active key element is connected to common bus of supply source and the second common point of LC₂R-circuit. At the outlet of active key element with serial C₁, impedance of loading circuit is realised at the main frequency and all its harmonics of the following type: Besides, values of main elements are determined from the following ratios:

where ω_s - angular frequency of input signal, Q_L - good quality of loaded filtering L_fC₂-circuit, - voltage of supply source, P - level of output signal capacity.

EFFECT: increased level of output capacity at maximum possible efficiency factor.

9 dwg, 1 ex