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US 8,412,136 B2Granted
Measuring load impedance of an amplifier driving a variable load
AssigneeTexas Instruments Incorporated
InventorsApu Sivadas, Gireesh Rajendran, Subhashish Mukherjee
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Abstract
According to an aspect of the present invention, the magnitude and phase angle of looking-in impedance driven by an amplifier are computed in digital domain during normal operation within a module containing the amplifier. In an embodiment, the computed magnitude and phase angle are used for impedance matching at a node driven by the amplifier. As a result, impedance matching may be obtained even in situations when the impedance changes during operation.
Claims20
A module comprising:
- an amplifier to receive an input signal and to generate a first amplified signal on a first path and a second amplified signal on a second path, said first path being characterized by a looking-in impedance driven by said amplifier;
- wherein each of said first amplified signal and said second amplified signal are amplified versions of said input signal;
- a load having a predetermined impedance coupled to said second path;
- and
- a computation block coupled to said first and second paths and configured to produce first and second digital values that respectively represent said first and second amplified signals, said computation block further configured to compute a magnitude and a phase angle of said looking-in impedance in digital domain based on a third digital value that represents said predetermined impedance and based on said first and second digital values.
2 more elements
An article of manufacture comprising:
- an amplifier to receive an input signal and to generate a first amplified signal on a first path and a second amplified signal on a second path;
- wherein each of said first amplified signal and said second amplified signal are amplified versions of said input signal, said first path being characterized by a looking-in impedance driven by said amplifier;
- a load having a predetermined impedance coupled to said second path;
- and
- a computation block coupled to said first and second paths and configured to produce first and second digital values that respectively represent said first and second amplified signals, said computation block further configured to compute a magnitude and a phase angle of said looking-in impedance in digital domain based on a third digital value that represents said predetermined impedance and based on said first and second digital values.
2 more elements
Dependencies are inferred from the claim text.