Impedance matching circuit

Details Impedance matching circuit Impedance matching circuit

H - Electricity

03

H

H03H 11/28 (2006.01) H03F 1/56 (2006.01)

Patent

CA 2164056

In a high frequency amplifying circuit, an impedance matching circuit has an impedance matching inductance, and a switching diode connected in parallel with the inductance. The diode is selectively opened or closed in accordance with the input level, thereby changing an impedance matching condition. When the input level is low, an amplified output is produced by impedance matching which is implemented by the inductance itself. When the input level increases up to a level nearly causing saturation to occur, the diode is opened and rendered conductive with the result that the impedance matching characteristic changes. As a result, a phase characteristic is prevented from being deteriorated by a changed in input level.

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