Driver circuit arrangement for driving load and differential drive arrangement thereof
AssigneeShenzhen Goodix Technology Co., Ltd.
InventorsBernardus Henricus Krabbenborg, Lutsen Dooper, Han Martijn Schuurmans
Life of this patent
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Abstract
A driver circuit arrangement for driving a load and a differential drive arrangement thereof are provided. The driver circuit arrangement employs a dual feedback configuration with a feedback resistor and a current sensor feedback arrangement. The current sensor feedback arrangement provides a current feedback path from the amplifier output to the amplifier input, and has a current sensor resistor connected in an output current path of the driver circuit arrangement. A current feedback amplifier is present connected to the current sensor resistor and to the amplifier input.
Claims20
A driver circuit arrangement for driving a load, comprising
- an amplifier with an amplifier input and an amplifier output, wherein in operation an input signal is provided to the amplifier input, and the amplifier output is connected to the load, the load being a capacitive load, and
- a dual feedback configuration comprising a feedback resistor and a current sensor feedback arrangement,
- the feedback resistor being connected between the amplifier output and the amplifier input and providing a voltage feedback path,
- the current sensor feedback arrangement providing a current feedback path from the amplifier output to the amplifier input, and comprising:
- a current sensor resistor connected in an output current path of the driver circuit arrangement, and
- a current feedback amplifier with inputs connected to the current sensor resistor and an output connected to the amplifier input;
- the current sensor resistor has a resistor value equal to REXT/N, wherein REXT is an output impedance value associated with a predetermined signal transfer function of the driver circuit arrangement, and N is an amplification factor of the current feedback amplifier.
A driver circuit arrangement for driving a load, comprising
- an amplifier with an amplifier input and an amplifier output, wherein in operation an input signal is provided to the amplifier input, and the amplifier output is connected to the load, the load being a capacitive load, and
- a dual feedback configuration comprising a feedback resistor and a current sensor feedback arrangement,
- the feedback resistor being connected between the amplifier output and the amplifier input and providing a voltage feedback path,
- the current sensor feedback arrangement providing a current feedback path from the amplifier output to the amplifier input, and comprising:
- a current sensor resistor connected in an output current path of the driver circuit arrangement, and
- a current feedback amplifier with inputs connected to the current sensor resistor and an output connected to the amplifier input;
- the amplifier is a class-D amplifier having a high side power FET connected to the amplifier output and to a supply voltage via a high side current path and a low side power FET connected to the amplifier output and to a ground via a low side current path, the current sensor resistor of the current sensor feedback arrangement being provided in series between the load and the ground.
A driver circuit arrangement for driving a load, comprising
- an amplifier with an amplifier input and an amplifier output, wherein in operation an input signal is provided to the amplifier input, and the amplifier output is connected to the load, the load being a capacitive load, and
- a dual feedback configuration comprising a feedback resistor and a current sensor feedback arrangement,
- the feedback resistor being connected between the amplifier output and the amplifier input and providing a voltage feedback path,
- the current sensor feedback arrangement providing a current feedback path from the amplifier output to the amplifier input, and comprising:
- a current sensor resistor connected in an output current path of the driver circuit arrangement, and
- a current feedback amplifier with inputs connected to the current sensor resistor and an output connected to the amplifier input;
- the amplifier is a class-D amplifier having a high side power FET connected to the amplifier output and to a supply voltage via a high side current path and a low side power FET connected to the amplifier output and to a ground via a low side current path, wherein both the high side current path and the low side current path are provided with a current sensor feedback arrangement.
Dependencies are inferred from the claim text.