Receiver circuit and gain controlling method thereof
AssigneeMontage Technology (Shanghai) Co., Ltd.
InventorShunfang Wu
Life of this patent
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Abstract
There is disclosed a receiver circuit and a method for controlling gain in a receiver circuit. The receiver circuit includes a first amplifying stage, a mixer, a filter and a second amplifying stage. The receiver circuit further includes a first feedback loop coupled to the first amplifying stage and configured to generate a first gain control signal for controlling the first signal gain according to a first amplified signal, wherein the first feedback loop operates to maintain the strength of the first amplified signal at a first threshold. The receiver circuit further includes a threshold controller coupled to the first feedback loop, wherein the threshold controller is configured to generate a first threshold control signal for adjusting the first threshold.
Claims29
A receiver circuit, comprising:
- a first amplifying stage having a first signal gain, the first amplifying stage being configured to receive an input signal and generate a first amplified signal;
- a mixer for converting the frequency of the first amplified signal;
- a filter for filtering the converted first amplified signal;
- a second amplifying stage having a second signal gain, the second amplifying stage being configured to receive the filtered first amplified signal and generate a second amplified signal;
- a first feedback loop coupled to the first amplifying stage and being configured to generate a first gain control signal for controlling the first signal gain according to the first amplified signal, wherein the first feedback loop operates to maintain the strength of the first amplified signal at a first threshold;
- and
- a threshold controller coupled to the first feedback loop, the threshold controller being configured to generate a first threshold control signal for adjusting the first threshold.
A receiver circuit, comprising:
- a first amplifying stage having one or more variable gain amplifiers, the first amplifying circuit being configured to receive an input signal and amplify the input signal;
- a mixer configured to convert the frequency of the amplified signal amplified by the first amplifying stage;
- a filter configured to filter the converted signal;
- a second amplifying stage having one or more variable gain amplifiers, the second amplifying stage being configured to amplify the filtered signal;
- one or more feedback loops, wherein each feedback loop is coupled to one or more of the one or more variable gain amplifiers of the first and second amplifying stages, and configured to generate a gain control signal for controlling the variable gain amplifiers coupled thereto according to an output signal outputted at a last amplifier of the one or more variable gain amplifiers coupled thereto, and wherein each feedback loop operates to maintain the strength of the output signal at a predetermined threshold;
- and
- a threshold controller coupled to at least one of the one or more feedback loops and configured to generate a threshold control signal to adjust the predetermined threshold.
A method, performed by a receiver circuit, for controlling gain in the receiver circuit, comprising:
- amplifying an input signal with a first signal gain to generate a first amplified signal, wherein the first signal gain is controlled to maintain the strength of the first amplified signal at a first threshold;
- converting the frequency of the first amplified signal;
- filtering the converted first amplified signal;
- amplifying the filtered first amplified signal with a second signal gain to generate a second amplified signal, wherein the second signal gain is controlled to maintain the strength of the second amplified signal at a second threshold;
- and
- adjusting the first threshold and/or the second threshold to improve the SNDR of the second amplified signal.
Dependencies are inferred from the claim text.