SWITCHING POWER AMPLIFIER Russian patent published in 2007 - IPC H03F3/193 

FIELD: radio engineering, possible use in high efficiency radio transmitters, operating in ranges of frequencies up to UHF range.

SUBSTANCE: switching power amplifier contains active key element, serial inductance (L₁), dividing capacitor (C_bl), parallel L₂CR-contour with active load (R) and powering voltage supply (V_ds) with throttle for power-wise decoupling of high frequency circuits. Active key element input is the input of device. Output is connected to serial L₁, which, on one side through the throttle is connected to V_ds, and on other side, - through C_bl is connected to common point of parallel L₂CR-contour, which point in its turn is the output of device. Common point of active key element is connected to common bus V_ds and to second common point of L₂CR-contour. Values of main elements of device are determined from following expressions: R=((1+π²/4)/2)V_ds ²/P, L₁=(2/π(1+π²/4))R/ω_s, C=((π²/4-1)π/4+1/Q_L)/(Rω_s), L₂=Q_LR/ω_s, where ω_s - angular frequency of input signal, Q_L - quality of loaded contour, V_ds - power supply voltage, P - power level of output signal. Amplifier realizes mode of operation in "E" class, when it is possible to produce efficiency which is theoretically equal to 100%.

EFFECT: increased output power level at maximal possible efficiency.

6 dwg