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US 2003/0117212 A1Published application
Circuits with dynamic biasing
AssigneeThe Trustees of Columbia University of the City of New York
InventorsNagendra Krishnapura, Yannis P. Tsividis
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Abstract
Techniques are provided for the implementation of dynamically biased circuits. In these circuits, bias currents are varied according to signal amplitude. Benefits include reduced power dissipation, reduced noise, and increased dynamic range. The techniques can be employed in various types of circuits such as, for example, amplifiers, log-domain circuits, and filters.
Claims16
An apparatus for processing a signal, comprising:
- a selected one of a class-AB circuit and a class-B circuit, the selected one having at least one input and at least one bias, the at least one input being adapted to receive at least one input signal, and the selected one being configured to process the at least one input signal to thereby generate at least one output signal related to the at least one input signal by an input-output characteristic having a crossover region which introduces distortion;
- and
- an amplitude detector configured to perform the operations of:
- receiving the at least one input signal,
- detecting at least one amplitude of the at least one input signal, and
- dynamically adjusting the at least one bias in accordance with the at least one amplitude, wherein the at least one bias controls a level of the at least one output signal such that the at least one output signal avoids the crossover region.
3 more elements
A method of processing a signal, comprising:
- receiving at least one input signal into a selected one of a class-AB circuit and a class-B circuit, the selected one having at least one bias;
- processing, by the selected one, the at least one input signal to thereby generate at least one output signal related to the at least one input signal by an input-output characteristic having a crossover region which introduces distortion;
- receiving, into an amplitude detector, the at least one input signal;
- detecting, by the amplitude detector, at least one amplitude of the at least one input signal;
- and
- dynamically adjusting, by the amplitude detector, the at least one bias in accordance with the at least one amplitude, wherein the at least one bias controls a level of the at least one output signal such that the at least one output signal avoids the crossover region.
3 more elements
Dependencies are inferred from the claim text.