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US 2003/0112060 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.
Claims10
A combined filter, comprising:
- a first filter having:
- a first filter configuration,
- a first bias input for receiving a first bias,
- a first input for receiving a first input signal, and
- a first output for providing a first output signal;
- a second filter having:
- a second filter configuration,
- a second bias input for receiving a second bias,
- a second input for receiving a second input signal, and
- a second output for providing a second output signal, the second filter configuration matching the first filter configuration, the first bias and the second bias being adjusted in accordance with at least one amplitude of at least one of the first input signal and the second input signal, and the first bias and the second bias being adjusted to be approximately equal;
- and
- a combined filter output configured to provide a combined output signal comprising a difference of the first output signal and the second output signal.
9 more elements
A method of processing a signal, comprising:
- receiving a first input signal into a first filter having a first filter configuration and a first bias;
- using the first filter to generate a first output signal;
- receiving a second input signal into a second filter having a second filter configuration and a second bias, the second filter configuration matching the first filter configuration, the first bias and the second bias being adjusted in accordance with at least one amplitude of at least one of the first input signal and the second input signal, and the first bias and the second bias being adjusted to be approximately equal;
- using the second filter to generate a second output signal;
- and
- providing a combined output signal comprising a difference of the first output signal and the second output signal.
3 more elements
Dependencies are inferred from the claim text.