High frequency tuning amplifier for buffer
AssigneeAlps Electric Co., Ltd.
InventorsKazuhiro Nakano, Hiroki Noumi
Life of this patent
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Abstract
The high frequency tuning amplifier for buffer has a tuning circuit consisting of a serial circuit of the first and second inductors connected between the output of transistor amplifying stage and the power source, a first capacitor connected in parallel to the serial circuit of first and second inductors, a serial circuit of the second and third capacitors connected in parallel to the second inductor and a switching element to which a band switch voltage is supplied, connected between the connecting point of the second and third capacitors and the reference voltage point. The tuning circuit is tuned to the high band frequency when the switching element is turned ON and to the low band frequency when the switching element is turned OFF.
Claims4
A high frequency tuning amplifier for buffer comprising a tuning circuit including:
- a first serial circuit of a first and a second inductors connected between an output of a transistor amplifying stage and a power source;
- a first capacitor connected in parallel to said first serial circuit of first and second inductors;
- a second serial circuit of second and third capacitors connected in parallel with the second inductor;
- and a switching element connected between said connecting point of the second and third capacitors and a reference voltage point to receive supply of a band switch voltage, wherein said tuning circuit is tuned to a high band frequency when said switching element is turned ON and tuned to a low band frequency when said switching element is turned OFF.
Dependencies are inferred from the claim text.