Variable gain amplifier device
AssigneeRealtek Semiconductor Corp.
InventorYi-Chun HSIEH
Life of this patent
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Abstract
A variable gain amplifier device includes a variable gain amplifier circuitry and a control voltage generating circuitry. The variable gain amplifier circuitry is configured to amplify input signals to generate output signals, wherein the variable gain amplifier circuitry includes a gain setting circuit that is configured to set a gain of the variable gain amplifier circuitry according to a control voltage. The control voltage generation circuitry is configured to simulate at least one circuit portion of the variable gain amplifier circuitry, in order to generate the control voltage according to the input signals and a setting voltage.
Claims16
A variable gain amplifier device comprising:
- a variable gain amplifier circuitry configured to amplify input signals to generate a plurality of output signals, wherein the variable gain amplifier circuitry comprises a gain setting circuit that is configured to set a gain of the variable gain amplifier circuitry according to a control voltage;
- and
- a control voltage generation circuitry configured to simulate at least one circuit portion of the variable gain amplifier circuitry, in order to generate the control voltage according to the input signals and a setting voltage.
A variable gain amplifier device comprising:
- a plurality of first transistors configured to generate a first output signal and a second output signal according to a first input signal and a second input signal;
- a second transistor coupled to the first transistors at a first node and a second node, wherein the second transistor is configured to receive a control voltage to set a gain;
- a third transistor configured to receive a first reference signal;
- a fourth transistor, wherein a first terminal of the fourth transistor is coupled to the third transistor;
- and
- an amplifier, wherein a first input terminal of the amplifier is configured to receive a second reference signal, a second input terminal of the amplifier is coupled to a second terminal of the fourth transistor, and an output terminal of the amplifier is coupled to a control terminal of the fourth transistor and configured to output the control voltage.
Dependencies are inferred from the claim text.