To make a delay circuit small in size and low in loss.
In the feedforward amplifier having a distortion detecting circuit, which is provided with a main amplifier signal path having a main amplifier and a linear signal path having a delay circuit, for detecting the non-linear distortion component of the main amplifier and a distortion removing circuit, which is provided with a main amplifier output path having a delay circuit and a distortion injection path having an auxiliary amplifier, for canceling the non-linear distortion component generated in the main amplifier by amplifying a non-linear distortion component detected by the distortion detecting circuit by the auxiliary amplifier and afterwards injecting the component to the output of the main amplifier again, the delay circuit of the main amplifier output path is composed of a waveguide delay circuit forming a higher harmonic wave suppression filter by providing the inductance of serial loading and the capacitance of parallel loading over multiple stages.
| JPS61248606 | HIGH FREQUENCY POWER AMPLIFIER |
| JPH0623058 | [Name of invention] Coaxial high-frequency amplifier |
| JP4252009 | High frequency amplifier |
NAKAYAMA MASATOSHI
SUEMATSU KENJI
TAKAGI SUNAO
Next Patent: ACOUSTIC SYSTEM