Circuit arrangement comprising a Cartesian amplifier

Details Circuit arrangement comprising a Cartesian amplifier Circuit arrangement comprising a Cartesian amplifier

1997-06-26

1999-11-02

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

With feedback of modulated output signal

455119, H01Q 1112

Patent

active

059786620

ABSTRACT:
A circuit having a Cartesian amplifier is disclosed. The Cartesian amplifier includes a re-combining stage which re-combines an input signal from a signal source with a correction signal to output a result signal. A first mixer mixes the result signal with a first oscillating signal from a local oscillator. A power amplifier amplifies the mixed signal and a coupler couples part of the amplified signal to form an outcoupling signal. A feedback path has a second mixer for forming the correction signal by mixing the outcoupling signal with a second oscillating signal from the local oscillator. An envelope curve detector detects the envelope of the amplified signal to produce an envelope signal, and a phase adjustor adjusts the phase of the first or second oscillating signal. A control circuit is provided to control the phase errors in a phase locked loop of the Cartesian amplifier and to minimized the envelope signal. The control circuit receives the envelop signal and has an adjustment output for providing an adjusting signal to the phase adjustor. The control circuit further has a modulation output to produce a measuring oscillation signal. A modulation stage modulates the phase position of one of the oscillating signals with the measuring oscillation signal.

REFERENCES:
patent: 5802451 (1998-09-01), Adachi et al.

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