Amplifier
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKoji Hashimoto, Yoshikuni Fujihashi, Hiroshi Takahashi, Kazuhiro Yahata
Life of this patent
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Abstract
The present invention relates to an amplifier comprising a first amplification circuit (1) formed of a first transistor (10) and a second amplification circuit (2) formed of a second transistor (11), wherein a first filter (3) having a desired pass-band and a desired attenuation band is connected between the output section of the foregoing first amplification circuit (1) and the input section of the foregoing second amplification circuit (2), thereby reducing noises in the output.
Claims29
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor,
- wherein the first filter is formed so as to have electrode patterns built in a dielectric of a relative dielectric constant exceeding 10 inclusive that is sandwiched between ground electrodes on the upper and bottom surfaces thereof, electrode patterns are formed over said ground electrode on the upper surface of said dielectric with a dielectric material of a relative dielectric constant not exceeding 10 placed in between and a first amplification circuit and a second amplification circuit are mounted on said electrode patterns.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor,
- wherein the first filter is formed so as to have electrode patterns built in a dielectric of a relative dielectric constant exceeding 10 inclusive that is sandwiched between ground electrodes on the upper and bottom surfaces thereof, electrode patterns are formed over said ground electrode on the upper surface of the dielectric with a dielectric material of a relative dielectric constant not exceeding 10 placed in between, a first amplification circuit and a second amplification circuit are mounted on said electrode patterns and also a part of terminal electrodes is formed over said ground electrode on the bottom surface of said dielectric with a dielectric material of a relative dielectric constant not exceeding 10 placed in between.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor;
- wherein the first filter is formed so as to have electrode patterns built in a dielectric sandwiched between ground electrodes on the upper and bottom surfaces thereof,
- wherein the first filter and amplification circuits are coupled by capacitance formed between opposing electrodes that have a dielectric material placed in between.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of the input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor, and further having a second filter, which has the same desired pass-band and desired attenuation band as said first filter has and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of the second transistor, directly connected to the output terminal of said second transistor,
- wherein the respective first and second filters are formed so as to have electrode patterns built in a dielectric of a relative dielectric constant exceeding 10 inclusive that is sandwiched between ground electrodes on the upper and bottom surfaces thereof, electrode patterns are formed over said ground electrode on the upper surface of said dielectric with a dielectric material of a relative dielectric constant not exceeding 10 placed in between and the first amplification circuit and second amplification circuit are mounted on the electrode patterns.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor,
- wherein the respective first and second filters are formed so as to have electrode patterns built in a dielectric of a relative dielectric constant exceeding 10 inclusive that is sandwiched between ground electrodes on the upper and bottom surfaces thereof, electrode patterns are formed over said ground electrode on the upper surface of said dielectric with a dielectric material of a relative dielectric constant not exceeding 10 placed in between, the first amplification circuit and second amplification circuit are mounted on said electrode patterns and also a part of terminal electrodes is formed over said ground electrode on the bottom surface of said dielectric with a dielectric material of a relative dielectric constant not exceeding 10 placed in between.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor,
- wherein the respective first filter and second filter are formed so as to have electrode patterns built in a dielectric sandwiched between ground electrodes on the upper and bottom surfaces thereof,
- wherein the respective first and second filters and amplification circuits are coupled by capacitance formed between opposing electrodes with a dielectric material placed in between.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor,
- wherein the respective first filter and second filter are formed so as to have electrode patterns built in a dielectric sandwiched between ground electrodes on the upper and bottom surfaces thereof,
- wherein a plurality of through holes or via holes connected to the upper side ground electrode and bottom side ground electrode are provided between the first filter and the second filter.
An amplifier having a first filter, which has a desired pass-band and a desired attenuation band and also has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of output impedance of a first transistor and the output impedance to a value between 1/2 to 2 times the real part of input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor,
- wherein the respective first filter and second filter are formed so as to have electrode patterns built in a dielectric sandwiched between ground electrodes on the upper and bottom surfaces thereof,
- wherein the first filter and second filter are formed of strip lines and the strip lines of the first filter are arranged to be perpendicular to the strip lines of the second filter in direction.
An amplifier having a first frequency variable filter, which has a desired pass-band and a desired attenuation band and has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a first transistor and also by adjusting the output impedance of a first filter to a value between 1/2 to 2 times the real part of the input impedance of a second transistor directly connected between the output terminal of the first transistor and the input terminal of the second transistor and having a frequency control voltage of a voltage controlled oscillator used as the control voltage of said frequency variable filter;
- wherein a computing circuit to compute a control voltage for the first frequency variable filter in accordance with a frequency control voltage of the voltage controlled oscillator is connected between the voltage controlled oscillator and the control voltage application terminal of the first frequency variable filter.
An amplifier having a first frequency variable filter, which has a desired pass-band and a desired attenuation band and has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a first transistor and also by adjusting the output impedance of a first filler to a value between 1/2 to 2 times the real part of the input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor and having a frequency control voltage of a voltage controlled oscillator used as the control voltage of said frequency variable filter,
- wherein resonators of the first frequency variable filter are formed inside of a multilayered substrate and a circuit section of the frequency variable filter and an amplification circuit are formed on the surface of the substrate, thereby integrating the whole assembly in one-piece.
An amplifier having a first frequency variable filter, which has a desired pass-band and a desired attenuation band and has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a first transistor and also by adjusting the output impedance of a first filter to a value between 1/2 to 2 times the real part of the input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor and further having a second frequency variable filter, which has the same desired pass-band and desired attenuation band as said first frequency variable filter has and has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a second transistor, directly connected to the output terminal of the second transistor and having a frequency control voltage of a voltage controlled oscillator used as the control voltage of said first and second frequency variable filters;
- wherein a computing circuit to compute a control voltage for the first and second-frequency variable filters in accordance with a frequency control voltage of the voltage controlled oscillator is connected between the voltage controlled oscillator and the control voltage application terminal of the respective first and second frequency variable filters.
An amplifier having a first frequency variable filter, which has a desired pass-band and a desired attenuation band and has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a first transistor and also by adjusting the output impedance of a first filter to a value between 1/2 to 2 times the real part of the input impedance of a second transistor, directly connected between the output terminal of the first transistor and the input terminal of the second transistor and further having a second frequency variable filter, which has the same desired pass-band and desired attenuation band as said first frequency variable filter has and has a difference between input impedance and output impedance by adjusting the input impedance to a value between 1/2 to 2 times the real part of the output impedance of a second transistor, directly connected to the output terminal of the second transistor and having a frequency control voltage of a voltage controlled oscillator used as the control voltage of said first and second frequency variable filters,
- wherein resonators of the first and second frequency variable filters are formed inside of a multilayered substrate and a circuit section of the respective first and second frequency variable filters and an amplification circuit are formed on the surface of the substrate, thereby integrating the whole assembly in one-piece.
Dependencies are inferred from the claim text.