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US 7,689,181 B2Granted
Circuit arrangement for regulating a DC signal component and mobile radio transmitter
AssigneeInfineon Technologies AG
InventorMichael Asam
Life of this patent
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Abstract
In a circuit arrangement for regulating a DC signal component of a signal that is input to a frequency mixer, the regulation comprises a detector which detects the DC component of the input signal. A comparator compares the DC component with a reference value, and drives an apparatus for influencing the DC component based on the comparison.
Claims20
A circuit arrangement for regulating a DC signal component, comprising:
- a modulator for frequency converting an influenced input signal received at an input of the modulator;
- a detector for detecting a DC component value of the influenced input signal and providing the detected DC component value at an output thereof;
- a comparator having a first input coupled to the output of the detector and configured to receive the detected DC component value thereat, a second input configured to receive a desired reference level, wherein the comparator is configured to generate a control signal at an output thereof as a function of a comparison between the detected DC component value and the reference level;
- and
- influence circuitry for influencing the DC component of an input signal as a function of the control signal received from the output of the comparator, thereby forming the influenced input signal at an output thereof,
- wherein the detector is connected between the output of the influence circuitry and the input of the modulator.
3 more elements
A mobile radio transmitter apparatus, comprising:
- a modulator for frequency converting an influenced input signal received at an input of the modulator;
- a detector for detecting a DC component value of the influenced input signal and providing the detected DC component value at an output thereof;
- a comparator having a first input coupled to the output of the detector and having a second input for receiving a desired reference level, wherein the comparator is configured to generate a control signal at an output thereof as a function of a comparison between the detected DC component value and the reference level;
- influence circuitry for influencing the DC component of an input signal as a function of the control signal received from the output of the comparator, thereby forming the influenced input signal at an output thereof,
- wherein the detector is connected between the influence circuitry and the modulator;
- and
- a baseband signal processing unit having an output for providing a useful signal as the input signal, the influence circuitry having a signal input connected to the output of the baseband signal processing unit.
4 more elements
Dependencies are inferred from the claim text.