Realtek Semiconductor Inc.

Yang Chang

Chia-jun Chang

Ka-Un Chan

Chia-Jun Chang

Kuan-Yu Shih

Chia-Yi Lee

The present invention discloses a variable gain amplifier circuit having linearity compensation mechanism is provided. A lower amplification transistor of a lower branch of an amplification circuit is controlled by an AC input signal. Upper amplification transistors of an upper branch generate an AC output signal at an amplification output terminal. An amplification control circuit controls the turn-on and turn-off of the upper amplification transistor according to an amplification control voltage. An inductor is electrically coupled between a power supply terminal and the amplification output terminal. In a gain adjustment circuit, each of adjustment control circuits controls the turn-on and turn-off of each of adjustment transistors according to a adjustment control voltage. A first voltage adjustment circuit adjusts an impedance of each of the adjustment transistors to further adjust an AC cross voltage relation between the lower amplification transistor and the upper amplification transistors.

Variable gain amplifier circuit and method having linearity compensation mechanism

An inductor device includes a first inductor, a second inductor, and at least one switch circuit. The second inductor is arranged to enclose the first inductor, and use a topmost layer metal to resist external interference for the first inductor. The at least one switch circuit is coupled to the second inductor, and is arranged to receive at least one control voltage, wherein the at least one control voltage is arranged to adjust conduction degree of the at least one switch circuit.

Inductor device that can resist external interference and adjust inductance value and quality factor of inductor

An amplifier device includes a regulator circuit, a first voltage converting circuit, a first control circuit, and an amplifier circuit. The regulator circuit is configured to output a first driving voltage. The first voltage converting circuit is coupled to the regulator circuit, and is configured to output one of the first driving voltage and at least one first voltages related to the first driving voltage, as a first operating voltage. The first control circuit is coupled to the first voltage converting circuit through a first node, and is configured to receive the first operating voltage and generate a first operating signal according to the first operating voltage and a first control signal. The amplifier circuit is coupled to the first control circuit and the regulator circuit, and is configured to receive the first driving voltage, and is controlled by the first operating signal to generate an output voltage.

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Hsinchu, Taiwan

Yang Chang