Amplification circuit with compensation for common-mode voltage fluctuation
AssigneeMediatek Inc.
InventorsYu-Hsin Lin, Fong-Wen Lee, Wen-Chieh Wang
Life of this patent
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Abstract
An amplification circuit with a common-mode voltage compensation circuit is shown. The common-mode voltage compensation circuit has a first compensation resistor coupled between an input terminal of a loop filter of the amplification circuit and a control node, and a second compensation resistor coupled between another input terminal of the loop filter and the control node. The control node is coupled to a power ground voltage when the two output signals of the amplification circuit are high, and it is coupled to a power supply voltage when the two output signals of the amplification circuit are low.
Claims13
An amplification circuit, comprising:
- a loop filter, a pulse-width modulation signal generator, a gate driver, a power driver, and a signal feedback circuit, configured to form a loop for signal amplification;
- and
- a common-mode voltage compensation circuit, providing a control node that is coupled to a first input terminal and a second input terminal of the loop filter,
- wherein:
- the power driver comprises:
- a first p-channel metal-oxide-silicon transistor, controlled by a first control signal generated by the gate driver to couple a first output terminal of the amplification circuit to a power supply voltage to pull up a first output signal of the amplification circuit;
- a first n-channel metal-oxide-silicon transistor, controlled by a second control signal generated by the gate driver to couple the first output terminal of the amplification circuit to a power ground voltage to pull down the first output signal of the amplification circuit;
- a second p-channel metal-oxide-silicon transistor, controlled by a third control signal generated by the gate driver to couple a second output terminal of the amplification circuit to the power supply voltage to pull up a second output signal of the amplification circuit;
- and
- a second n-channel metal-oxide-silicon transistor, controlled by a fourth control signal generated by the gate driver to couple the second output terminal of the amplification circuit to the power ground voltage to pull down the second output signal of the amplification circuit;
- and
- the common-mode voltage compensation circuit is controlled by the first control signal, the second control signal, the third control signal, and the fourth control signal, to couple the control node to a power ground voltage when both first output signal and a second output signal of the amplification circuit are high, and to couple the control node to a power supply voltage when both the first output signal and the second output signal of the amplification circuit are low.
Dependencies are inferred from the claim text.