Power amplifier module with distortion compensation
AssigneeKoninklijke Philips Electronics N.V.
InventorMarius Gerardus Jacobus Versteegen
Life of this patent
Estimating the term…
Abstract
The invention relates to a power amplifier module comprising a first amplifier 2 having a first front-end 4 and a first backend amplifier stage 5 and a second amplifier 3 having a second front-end 6 and a second backend amplifier stage 7, the first amplifier and the second amplifier being arranged in a Bridge Tied Load (BTL) configuration with feedback over the load, characterized in that the first and the second backend amplifier stages having point symmetrical transfer functions with respect to the origin, the input current i1 of the first backend amplifier stage being substantially equal to the input current i2 of the second backend amplifier stage.
Claims10
A power amplifier module comprising a first amplifier (2) having a first front-end (4) and a first backend amplifier stage (5) and a second amplifier (3) having a second front-end (6) and a second backend amplifier stage (7), the first amplifier and the second amplifier being arranged in a Bridge Tied Load (BTL) configuration with feedback over the load, characterized in that the first and the second backend amplifier stages having point symmetrical transfer functions with respect to the origin, the input current (i1) of the first backend amplifier stage being substantially equal to the input current (i2) of the second backend amplifier stage, wherein at least the first front-end amplifier stage comprises a voltage controlled current source (10), an output terminal (11) of the voltage controlled current source supplying the input current (i1) for the first backend amplifier stage and the output terminal (13) of the voltage controlled current source being connected to an input terminal (20) of the second backend amplifier stage.
A power amplifier module comprising a first amplifier (2) having a first front-end (4) and a first backend amplifier stage (5) and a second amplifier (3) having a second front-end (6) and a second backend amplifier stage (7), the first amplifier and the second amplifier being arranged in a Bridge Tied Load (BTL) configuration with feedback over the load, characterized in that the first and the second backend amplifier stages having point symmetrical transfer functions with respect to the origin, the input current (i1) of the first backend amplifier stage being substantially equal to the input current (i2) of the second backend amplifier stage, comprising an input arrangement for supplying an input signal current (Iin) over the non-inverting and inverting input terminals (16, 17) of the second front-end amplifier stage.
A power amplifier module comprising a first single ended amplifier (2) having a first front end (4) and a first backend amplifier stage (5) and a second single ended amplifier (3) having a second front end (6) and a second backend amplifier stage (7), the first and the second amplifiers being arranged in a Bridge Tied Load (BTL) configuration, characterized in that the first and the second backend amplifier stages having point symmetrical transfer functions with respect to the origin, the input current (i1) of the first backend amplifier stage being substantially equal to the input current (i2) of the second backend amplifier stage that has been provided from a summing node fed by inverted input current that has been doubled.
A power amplifier module comprising a first amplifier (2) having a first front-end (4) and a first backend amplifier stage (5) and a second amplifier (3) having a second front-end (6) and a second backend amplifier stage (7), the first amplifier and the second amplifier being arranged in a Bridge Tied Load (BTL) configuration with feedback over the load, characterized in that the first and the second backend amplifier stages having point symmetrical transfer functions with respect to the origin, the input current (i1) of the first backend amplifier stage being substantially equal to the input current (i2) of the second backend amplifier stage, the first and the second backend amplifier stages each comprising an output capacitor (Cm2) interposed between transistors that are in a cascode configuration.
A method for creating a power amplifier module comprising:
- providing a first amplifier (2) having a first front-end (4) and a first backend amplifier stage (5);
- providing a second amplifier (3) having a second front-end (6) and a second backend amplifier stage (7), wherein the first amplifier and the second amplifier are arranged in a Bridge Tied Load (BTL) configuration with feedback over the load, wherein at least the first front-end amplifier stage comprises a voltage controlled current source (10);
- supplying, from an output terminal (11) of the voltage controlled current source, the input current (i1) for the first backend amplifier stage;
- and
- connecting the output terminal (13) of the voltage controlled current source to an input terminal (20) of the second backend amplifier stage,
- wherein the first and the second backend amplifier stages have point symmetrical transfer functions with respect to the origin, the input current (i1) of the first backend amplifier stage being substantially equal to the input current (i2) of the second backend amplifier stage.
Dependencies are inferred from the claim text.