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US 7,742,091 B2Granted
Flexy-power amplifier: a new amplifier with built-in power management
AssigneeAptina Imaging Corporation
InventorGiuseppe Rossi
Life of this patent
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Abstract
A voltage amplifier is provided. The voltage amplifier includes an amplifier stage to amplify an input signal. A bias current generator supplies a bias current to the amplifier stage. The bias current generator is controllable in response to a frame rate signal that is representative of a video frame rate. A compensation network stabilizes a loop response of the voltage amplifier. The compensation network is controllable in response to the frame rate signal.
Claims20
A voltage amplifier, comprising:
- an amplifier stage to amplify an input signal;
- and
- a bias current generator to supply a bias current to the amplifier stage, the bias current generator controllable in response to a frame rate signal, the frame rate signal being representative of a video frame rate,
- wherein a loop response of the voltage amplifier is stabilized in response to the frame rate signal.
1 more element
A voltage amplifier having a controlled output comprising:
- a first stage to amplify an input signal;
- a second stage coupled to an output of the first stage to generate the controlled output;
- a first bias current generator to supply a first bias current to the first stage, the first bias current generator controllable in response to a frame rate signal;
- and
- a second bias current generator to supply a second bias current to the second stage, the second bias current generator controllable in response to the frame rate signal,
- wherein a loop response of the voltage amplifier is stabilized in response to the frame rate signal.
3 more elements
A method of generating a driver voltage for a CMOS imager, comprising:
- providing an amplifier;
- determining a video frame rate of the CMOS imager;
- in the amplifier, generating the driver voltage as a function of an input voltage;
- and
- controlling a bias current of the amplifier as a function of the video frame rate such that at a lower frame rate the bias current is reduced,
- wherein at a lower frame rate a bandwidth of the amplifier is reduced as a function of the video frame rate.
3 more elements
Dependencies are inferred from the claim text.