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US 7,889,010 B2Granted
Compensation circuit
AssigneesVimicro Corporation, Wuxi Vimicro Corporation
InventorZhao Wang
Life of this patent
Estimating the term…
Abstract
An improved compensation circuit with loop compensation is disclosed. The compensation circuit can get an equivalent large capacitance by amplifying a small capacitor. Hence, the compensation circuit can get a good compensation effect with a minimum chip area, hence lower cost.
Claims10
A compensation circuit comprising:
- a first transconductance amplifier having an inverse input, a non-inverse input and an output;
- a first resistor having one terminal coupled to the output of the first transconductance amplifier;
- a capacitor connected with the first resistor in series, one terminal of the capacitor coupled to the inverse input of the first transconductance amplifier;
- a second resistor connected between the first resistor and the capacitor in series;
- a second transconductance amplifier having an inverse input, a non-inverse input and an output, the inverse input of the second transconductance amplifier coupled to the output of the second transconductance amplifier, the output of the second transconductance amplifier coupled to an intermediate node between the first resistor and the second resistor, and the non-inverse input of the second transconductance amplifier coupled to an intermediate node between the capacitor and the second resistor.
2 more elements
A compensation circuit, comprising:
- a first transconductance amplifier having an inverse input, a non-inverse input and an output;
- a first resistor having one terminal coupled to the output of the first transconductance amplifier;
- a second resistor connected with the first resistor in series, one terminal coupled to the inverse input of the first transconductance amplifier;
- a capacitor connected between the first resistor and the second resistor in series;
- a second transconductance amplifier having an inverse input, a non-inverse input and an output, the inverse input of the second transconductance amplifier coupled to the output of the second transconductance amplifier, the output of the second transconductance amplifier coupled to an intermediate node between the second resistor and the capacitor, and the non-inverse input of the second transconductance amplifier coupled to the inverse input of the first transconductance amplifier.
2 more elements
Dependencies are inferred from the claim text.