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US 2003/0112059 A1Published application
Circuits with dynamic biasing
AssigneeThe Trustees of Columbia University in 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.
Claims26
An apparatus for processing a signal, comprising a filter having:
- at least one input;
- and
- first and second biases, wherein the at least one input comprises first and second inputs, the first input being adapted to receive a first input signal and a first bias signal related to an amplitude of at least one of the first input signal and a second input signal, the first bias signal being for controlling the first bias, the second input being adapted to receive the second input signal and a second bias signal, the second bias signal being for controlling the second bias, the second bias signal being approximately equal to the first bias signal, and the filter being configured to filter a difference of the first and second input signals, thereby generating a filter output signal.
A method of processing a signal, comprising:
- receiving a first input signal into a filter having first and second biases;
- receiving a second input signal into the filter;
- receiving, into the filter, a first bias signal related to an amplitude of at least one of the first and second input signals, the first bias signal being for controlling the first bias;
- receiving, into the filter, a second bias signal, the second bias signal being for controlling the second bias, and the second bias signal being approximately equal to the first bias signal;
- and
- filtering a difference of the first and second input signals, thereby generating a filter output signal.
3 more elements
Dependencies are inferred from the claim text.