Power amplifier circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsSatoshi GOTO, Yuri HONDA, Yoshiki KOGUSHI
Life of this patent
Estimating the term…
Abstract
A power amplifier circuit includes a differential amplifier circuit configured to amplify a radio-frequency signal, a transformer disposed on an output side with respect to the differential amplifier circuit and including a primary winding and a secondary winding, and a dispersion circuit coupled to a midpoint of the primary winding of the transformer and configured to operate as an adjustment circuit. The dispersion circuit is configured to adjust, based on a supply voltage controlled in accordance with the envelope of the radio-frequency signal, a bias (bias current or bias voltage) to be supplied to the differential amplifier circuit.
Claims16
A power amplifier circuit comprising:
- a first amplifier circuit and a second amplifier circuit connected in series with each other, and configured to amplify an input radio-frequency signal;
- a transformer on an output side of the second amplifier circuit, the transformer comprising a primary winding and a secondary winding;
- and
- an adjustment circuit coupled to a midpoint of the primary winding of the transformer, the adjustment circuit being configured to adjust a bias supplied to the first amplifier circuit or the second amplifier circuit based on a supply voltage,
- wherein the supply voltage is supplied to the midpoint of the primary winding of the transformer and is controlled in accordance with an envelope of the input radio-frequency signal.
A power amplifier circuit comprising:
- a first differential amplifier circuit and a second differential amplifier circuit connected in series with each other, and configured to amplify an input radio-frequency signal;
- a transformer on an output side of the first differential amplifier circuit and on an input side of the second differential amplifier circuit, the transformer comprising a primary winding and a secondary winding;
- and
- an adjustment circuit coupled to a midpoint of the primary winding of the transformer, the adjustment circuit being configured to adjust a bias supplied to the first differential amplifier circuit or the second differential amplifier circuit based on a supply voltage,
- wherein the supply voltage is supplied to the midpoint of the primary winding of the transformer and is controlled in accordance with an envelope of the input radio-frequency signal.
Dependencies are inferred from the claim text.