MULTI-STAGE AMPLIFIER
First Claim
1. A controller for controlling the supply of a regulated output voltage based on an input voltage, the controller comprising:
- an input node configured to receive the input voltage;
an output node configured to be coupled to the regulated output voltage; and
an error amplifier coupled between the input node and the output node, the error amplifier including an integrator configured to provide a first passband for a first difference signal, a differentiator configured to provide a second passband for a second difference signal, and a combiner circuit that combines outputs of the integrator and the differentiator, wherein at least one of the integrator, the differentiator and the combiner include an operational transconductance amplifier.
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Abstract
In an embodiment, an amplifier includes first, second, and third stages, and a feedback network. The first stage has a first passband and is configured to generate a first output signal in response to first and second input signals, and the second stage has a second passband that is higher in frequency than the first passband and is configured to generate a second output signal in response to third and fourth input signals. The third stage has a first input node coupled to receive the first output signal, a second input node coupled to receive the second output signal, and an output node. And the feedback network is coupled between the second input node and the output node of the third stage. For example, where the first, second, and third stages are respective operational-transconductance-amplifier stages, such an amplifier may be suitable for low-power applications.
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Citations
13 Claims
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1. A controller for controlling the supply of a regulated output voltage based on an input voltage, the controller comprising:
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an input node configured to receive the input voltage; an output node configured to be coupled to the regulated output voltage; and an error amplifier coupled between the input node and the output node, the error amplifier including an integrator configured to provide a first passband for a first difference signal, a differentiator configured to provide a second passband for a second difference signal, and a combiner circuit that combines outputs of the integrator and the differentiator, wherein at least one of the integrator, the differentiator and the combiner include an operational transconductance amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for controlling the supply of a regulated output voltage based on an input voltage, the method comprising:
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receiving the input voltage; receiving a signal related to the regulated output voltage; low-pass filtering a first difference signal to produce a first output, the first difference signal being generated based on the signal related to the regulated output voltage; high-pass filtering a second difference signal to produce a second output; and combining the first and second outputs to produce a compensation signal, wherein the compensation signal is used to control the supply of the regulated output voltage.
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Specification