Operational amplifier and method for amplifying a signal with shared compensation components
First Claim
1. An operational amplifier circuit comprising:
- amplifier circuitry for amplifying a differential signal, wherein said amplifier circuitry is operable to generate a differential output signal;
a differential feedback network coupled to said amplifier circuitry and operable to provide differential feedback compensation therein, said differential feedback network comprising compensation elements; and
a common-mode feedback network coupled to said amplifier circuitry and operable to provide common-mode feedback compensation therein, said common-mode feedback network sharing said compensation elements of said differential feedback network.
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Accused Products
Abstract
An operational amplifier and a method for amplifying a signal. Embodiments provide a convenient and effective mechanism for reducing die area, design time and design verification time by sharing compensation components between the common-mode and differential feedback networks of the operational amplifier. As such, fewer compensation components are required, thereby reducing component die area. Additionally, given that the compensation components are shared between the common-mode and differential feedback networks, the feedback networks can be stabilized together with fewer compensation components to specify and verify, thereby reducing design and design verification time. Further, embodiments provide a compensation component coupling which does not couple directly to virtual ground, thereby reducing the noise of the operational amplifier.
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Citations
20 Claims
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1. An operational amplifier circuit comprising:
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amplifier circuitry for amplifying a differential signal, wherein said amplifier circuitry is operable to generate a differential output signal; a differential feedback network coupled to said amplifier circuitry and operable to provide differential feedback compensation therein, said differential feedback network comprising compensation elements; and a common-mode feedback network coupled to said amplifier circuitry and operable to provide common-mode feedback compensation therein, said common-mode feedback network sharing said compensation elements of said differential feedback network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An operational amplifier comprising:
- amplifier circuitry;
a common-mode feedback loop coupled to said amplifier circuitry and for controlling common-mode operation of said operational amplifier, said common-mode operation comprising an adjustment of an operating point of said operational amplifier; a differential feedback loop coupled to said amplifier circuitry and for controlling differential operation of said operational amplifier, said differential operation comprising an amplification of a differential signal input to said operational amplifier; and wherein said common-mode and differential feedback loops are coupled to at least one common compensation component operable to improve stability of both said common-mode and differential operation of said operational amplifier. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- amplifier circuitry;
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15. A method for amplifying a differential signal comprising:
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controlling differential operation of an operational amplifier using a differential feedback loop, said differential operation comprising an amplification of said differential signal input to said operational amplifier; controlling common-mode operation of said operational amplifier using a common-mode feedback loop, said common-mode operation comprising an adjustment of an operating point of said operational amplifier; and stabilizing said differential and common-mode operation of said operational amplifier using shared compensation components coupled to said differential and common-mode feedback loops. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification