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US 7,741,910 B2Granted
Capacitor gain-boost circuit
OwnerLouis Sze Wonginventor
Life of this patent
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Abstract
A circuit is disclosed that comprises a capacitor gain-boost circuit and an amplifier coupled to capacitor gain-boost circuit. A capacitor gain-boost circuit comprises of capacitor, gain-boost amplifier and biasing circuit. The gain-boost amplifier and capacitor provides optimum biasing operation and performance. Accordingly, through the use of capacitor gain-boost circuit, the supply voltage range and power consumption of an amplifier is optimized while the gain of amplifier is improved.
Claims11
A circuit comprising:
- a) capacitor gain-boost circuit;
- b) main amplifier coupled with the capacitor gain-boost circuit;
- c) the capacitor gain-boost circuit comprised of a capacitor, a gain-boost amplifier, a cascode transistor, and a biasing circuit, wherein the capacitor is connected between the source of the cascade transistor and the input of the gain-boost amplifier, wherein the output of the gain-boost amplifier is connected to the gate of the cascode transistor, wherein the biasing circuit producing a bias potential to the input of gain-boost amplifier;
- d) the cascode transistor of the capacitor gain-boost circuit is coupled to the main amplifier;
- e) wherein the capacitor gain-boost circuit comprises one or a plurality of capacitor gain-boost circuits.
2 more elements
A method of operating an amplifier circuit, the method comprising:
- boosting the gain of an amplifier by,
- a) coupling a drain of a cascode transistor to a current source circuit or other circuit, and coupling a source of the cascode transistor to a drain of an amplifier transistor;
- b) driving a gate of the cascode transistor by means of a gain-boost amplifier, in series with a single or a plurality of capacitors, and/or a single or a plurality of switches for the purpose of setting the operating point, wherein this accomplishes the function of increasing the output impedance of the amplifier circuit.
Dependencies are inferred from the claim text.