Linearity adjusting circuit

Details Linearity adjusting circuit Linearity adjusting circuit

H - Electricity

04

N

350/48

H04N 5/20 (2006.01) H04N 5/38 (2006.01)

Patent

CA 1311553

- 19 - ABSTRACT OF THE DISCLOSURE A linearity correction circuit for television transmission operates at intermediate frequency to introduce appropriate pre-distortion into the amplitude envelope to compensate for non-linearity in the power amplifier stages. An array of parallel current sources (11), each of which is independently adjustable in response to the perceived requirement for pre-distortion over a corresponding amplitude band, to inject a current sufficient to introduce an appropriate differential voltage at the output. The circuit provides for the - independent correction of each amplitude band, so that it is capable of operation under microprocessor control in real time.

579632

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