Transmitter for high frequency signals
First Claim
1. A transmitter for high frequency signals, said transmitter comprisingtwo parallel signal branches, each including a phase modulator (PM1, PM2) and an amplifier (V1, V2);
- a dividing network (WE) including means for dividing a received signal into received signal components (S1, S2) fed to the respective signal branches to form output signals (S11, S22) and means for periodically exchanging an assignment of said signal components (S1, S2) to the respective parallel signal branches at a predetermined cycle frequency (fc);
a combining device (KB) for combining the output signals (S11, S22) from both of said two parallel signal branches into a sum signal (SS); and
means (HD, PS) for detecting amplitude modulation of the sum signal (SS) generated by periodic exchange of said signal components (S1, S2) and for changing a phase of said signal components in at least one of the signal branches according to the amplitude modulation so as to minimize said amplitude modulation.
1 Assignment
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Accused Products
Abstract
The transmitter is built according to the LINC principle and has two parallel signal branches, each of which includes an amplifier (V1, V2) and a phase modulator (PM1, PM2). A dividing network (WE) is provided which divides the received signal (DI) between both signal branches and a combining device (KB) which adds the output signals (S11, S22) of both signal branches to form a sum signal (SS). In order to control the phase error in both signal branches the dividing network (WE) is designed so that the assignment of the received signal components (S1, S2) in both signal branches is periodically exchanged at a predetermined cycle frequency (fc). The amplitude modulation of the sum signal (SS) generated by the cyclic exchange of the input signal components (S1,S2) is detected and the phase depending on it in at least one of the signal branches is changed so that amplitude modulation is minimized.
92 Citations
7 Claims
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1. A transmitter for high frequency signals, said transmitter comprising
two parallel signal branches, each including a phase modulator (PM1, PM2) and an amplifier (V1, V2); -
a dividing network (WE) including means for dividing a received signal into received signal components (S1, S2) fed to the respective signal branches to form output signals (S11, S22) and means for periodically exchanging an assignment of said signal components (S1, S2) to the respective parallel signal branches at a predetermined cycle frequency (fc); a combining device (KB) for combining the output signals (S11, S22) from both of said two parallel signal branches into a sum signal (SS); and means (HD, PS) for detecting amplitude modulation of the sum signal (SS) generated by periodic exchange of said signal components (S1, S2) and for changing a phase of said signal components in at least one of the signal branches according to the amplitude modulation so as to minimize said amplitude modulation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification