Nonlinear distortion detecting circuit and nonlinear distortion

Details Nonlinear distortion detecting circuit and nonlinear distortion Nonlinear distortion detecting circuit and nonlinear distortion

1997-02-12

1999-06-01

Bost, Dwayne D.

Telecommunications

Transmitter

Having harmonic radiation suppression

455115, 455126, 455127, 375297, H04B 104

Patent

active

059096420

ABSTRACT:
An input unit enters two reference signals having respective different frequencies at a stage preceding a power amplifier. The reference signals are delivered through a predistortion circuit to a power amplifier, and supplied from a predetermined section of the power amplifier. The signals from the power amplifier contain a third-order intermodulation distortion component. Based on the signals from the power amplifier, an extracting unit extracts a frequency component having a frequency which is twice the difference between the frequencies of said two reference signals. A detecting unit detects the extracted frequency component thereby to output a DC voltage. Since the extracted frequency component is correlated to the third-order intermodulation distortion component, the DC voltage represents the magnitude of the third-order inter-modulation distortion component.

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patent: 5712593 (1998-01-01), Buer et al.
patent: 5745006 (1998-04-01), Budnik et al.
patent: 5748678 (1998-05-01), Valentine et al.

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