High frequency amplifier
AssigneeMitsubishi Electric Corporation
InventorYoshinobu Sasaki
Life of this patent
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Abstract
An amplifier (T1) amplifies an input signal. A harmonic matching circuit (3) is connected to an output end of the amplifier (T1) via a first wire (W1). The harmonic matching circuit (3) includes a first inductor (L1) connected to the first wire (W1), a first capacitor (C1) connected in series to the first inductor (L1), a second inductor (L2) connected in parallel with the first inductor (L1), and a second capacitor (C2) connected in series to the second inductor (L2). The first inductor (L1) and the second inductor (L2) form a subtractive-polarity coupler which presents mutual inductance having subtractive polarity.
Claims12
A high frequency amplifier comprising:
- an amplifier amplifying an input signal;
- and
- a harmonic matching circuit connected to an output end of the amplifier via a first wire,
- wherein the harmonic matching circuit includes a first inductor connected to the first wire, a first capacitor connected in series to the first inductor, a second inductor connected in parallel with the first inductor, and a second capacitor connected in series to the second inductor, and
- the first inductor and the second inductor form a subtractive-polarity coupler which presents mutual inductance having subtractive polarity,
- wherein
- impedance for the harmonic matching circuit viewed from the output end of the amplifier is open-circuited for a fundamental harmonic, short-circuited for a second harmonic and open-circuited for a third harmonic of the input terminal, and the high frequency amplifier performs class F operation.
A high frequency amplifier comprising:
- an amplifier amplifying an input signal;
- and
- a harmonic matching circuit connected to an output end of the amplifier via a first wire,
- wherein the harmonic matching circuit includes a first inductor connected to the first wire, a first capacitor connected in series to the first inductor, a second inductor connected in parallel with the first inductor, and a second capacitor connected in series to the second inductor, and
- the first inductor and the second inductor form a subtractive-polarity coupler which presents mutual inductance having subtractive polarity,
- wherein impedance for the harmonic matching circuit viewed from the output end of the amplifier is open-circuit for a second harmonic and short-circuit for a third harmonic of the input terminal, and the high frequency amplifier performs inverse class F operation.
Dependencies are inferred from the claim text.