Patent ID: 8502605
Filing Date: 2013-08-06
Classification: H03F

Abstract:
1. An acoustic pseudo-triode characteristic push-pull amplification device comprising: first and second current-driving sources that respectively output signals responding to a common input signal, and have electric characteristics that are complementary with each other; a first pseudo-triode characteristic amplification unit that receives a signal from the first current-driving source; and a second pseudo-triode characteristic amplification unit that receives a signal from the second current-driving source and has an electric characteristic complementary with that of the first pseudo-triode characteristic amplification unit, wherein each of the first and second pseudo-triode characteristic amplification units includes, a semiconductor element that has a first electrode, a second electrode, and a control electrode, where a current flowing between the first electrode and the second electrode varies depending on a signal applied to the control electrode; an acoustic load terminal that is provided in a path drawn from the first electrode and is connected to an acoustic load which is interposed between the acoustic load terminal and a ground conductor; and a second electrode side resistor that is provided between the second electrode and a reference voltage terminal; wherein the first pseudo-triode characteristic amplification unit comprises: a first input terminal that leads a signal from the first current-driving source to the control electrode in the first pseudo-triode characteristic amplification unit; and an input side resistor that is provided between the first electrode and the first input terminal in the first pseudo-triode characteristic amplification unit, wherein the second pseudo-triode characteristic amplification unit comprises: a second input terminal that leads a signal from the second current-driving source to the control electrode in the second pseudo-triode characteristic amplification unit; and an input side resistor that is provided between the first electrode and the second input terminal in the second pseudo-triode characteristic amplification unit, wherein DC voltages having different polarities are respectively applied between the reference voltage terminal of the first pseudo-triode characteristic amplification unit and the ground conductor, and between the reference voltage terminal of the second pseudo-triode characteristic amplification unit and the ground conductor, wherein the acoustic load terminal of the first pseudo-triode characteristic amplification unit and the acoustic load terminal of the second pseudo-triode characteristic amplification unit are connected in common, and a common acoustic load is connected to the first and second pseudo-triode characteristic amplification units, wherein the first current driving source has a current-driving semiconductor element that allows a current varying depending on the input signal to flow through the first input terminal with signal source impedance greater than input impedance of the first input terminal, and wherein the second current driving source has a current-driving semiconductor element that allows a current varying depending on the input signal to flow through the second input terminal with signal source impedance greater than input impedance of the second input terminal.