FIELD: push-pull power amplifiers. SUBSTANCE: amplifier that has two power amplifiers 1, balancing transformer 3, connecting cable 6, and change- over subband harmonic filters 8 uses low-frequency filter whose cutoff frequency is higher than operating frequency of power amplifier 1. First capacitor 2 of low-frequency filter is installed at input of balancing transformer 3. Series inductance coil 4 and capacitor 5 of low-frequency filter connected in parallel with connecting cable input are inserted in non- balanced circuit between balancing transformer 3 and connecting cable 6. EFFECT: improved efficiency and linearity. 1 dwg
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