Circuit arrangement and method for compensating for abrupt signal level changes in amplification devices
First Claim
1. A circuit arrangement, comprising:
- first and second adjustable amplification devices, wherein a signal output of the first amplification device is coupled to a signal input of the second amplification device, and wherein the first amplification device comprises a digital control amplifier having a control input, and the second amplification device has a control input for controlling a gain thereof;
a control unit coupled to the control inputs of the first and second amplification devices, and configured to provide control signals thereto such that a change in the gain of the second amplification device in one direction is effected by a change in gain in the first amplification device in the opposite direction; and
a level detection device connected to the signal output of the first amplification device, and configured to perform a level comparison of the signal output with an upper and a lower limit value, and output a comparison signal at an output thereof, and provide the comparison signal to the control circuit.
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Accused Products
Abstract
A circuit arrangement includes two adjustable amplification devices where the signal output of the first amplification device is connected to the signal input of the second amplification device. The first amplification device has a digital input for controlling its gain and the second amplification device has an input for controlling its gain. The input for gain control in the second amplification device is connected to the input for controlling the gain of the first amplification device via a means such that a change in the gain of the second amplification device in one direction is effected by a change in gain, brought about by means of the control, in the first amplification device in the opposite direction such that the total gain remains essentially the same.
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Citations
13 Claims
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1. A circuit arrangement, comprising:
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first and second adjustable amplification devices, wherein a signal output of the first amplification device is coupled to a signal input of the second amplification device, and wherein the first amplification device comprises a digital control amplifier having a control input, and the second amplification device has a control input for controlling a gain thereof; a control unit coupled to the control inputs of the first and second amplification devices, and configured to provide control signals thereto such that a change in the gain of the second amplification device in one direction is effected by a change in gain in the first amplification device in the opposite direction; and a level detection device connected to the signal output of the first amplification device, and configured to perform a level comparison of the signal output with an upper and a lower limit value, and output a comparison signal at an output thereof, and provide the comparison signal to the control circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A receiver circuit, comprising:
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a digital control adjustable amplifier configured to receive an analog input signal and generate a first amplified signal based on a digitally adjustable gain associated therewith; a frequency converter device configured to receive the first amplified signal and generate a frequency converted signal; an analog control adjustable amplifier configured to receive the frequency converted signal and generate a second amplified signal based on an analog adjustable gain associated therewith; and a control unit configured to evaluate signal conditions of the receiver circuit and generate first and second control signals for the digital control adjustable amplifier and the analog control adjustable amplifier in response thereto, respectively, wherein the first control signal dictates a change in gain of the digital control adjustable amplifier in a first gain direction, and the second control signal dictates a change in gain of the analog control adjustable amplifier in a second, opposite direction, wherein the control unit comprises; a level detector circuit configured to evaluate the first amplified signal or the frequency converted signal and generate an evaluation result signal in response thereto; and a control circuit configured to receive the evaluate result signal and generate the first and second control signals in response thereto. - View Dependent Claims (9, 10, 11, 12)
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13. A method for compensating for abrupt signal level changes in an amplification device, comprising:
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applying a first digital actuating signal to a control input of a first digital control amplifier; converting the first digital actuating signal into a second analog actuating signal, which is applied to a control input of a second amplification device; wherein a change in the actuating signal at the control input of the first amplification device alters a gain thereof and prompts a change in a gain in the opposite direction at the input of the second amplification device such that the total gain of the two amplification devices remains essentially the same; and comparing a level of the output signal from one or both amplification devices with an upper limit, a lower limit, or both, and altering the first and second actuating signals in response thereto.
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Specification