Continuous variable gain amplifier

A continuous variable gain amplifier, comprising an attenuator network, a boost network, a first amplifying network, and a second amplifying network, wherein:

• the attenuator network consists of resistors and is configured to adjust attenuation of the continuous variable gain amplifier;
• the boost network consists of resistors and is configured to adjust a gain of the continuous variable gain amplifier;
• and the attenuator network generates first differential output signals according to an input signal and sends the first differential output signals to the first amplifying network and the second amplifying network;
• the first amplifying network receives a first output of the first differential output signals sent by the attenuator network, and generates a first final output signal according to an externally input control voltage;
• the second amplifying network receives a second output of the first differential output signals sent by the attenuator network, and generates a second final output signal according to an externally input control voltage;
• the boost network receives the first final output signal output by the first amplifying network and the second final output signal output by the second amplifying network, generates second differential output signals, and sends a first output and a second output of the second differential output signals to the first amplifying network and the second amplifying network, respectively, wherein the first output and the second output of the second differential output signals are used by the first amplifying network and the second amplifying network to generate the first final output signal and the second final output signal, respectively;
• and
• during a gain status of the continuous variable gain amplifier, the attenuator network stops working, and the gain of the continuous variable gain amplifier is adjusted by the boost network, and during an attenuation status of the continuous variable gain amplifier, the boost network stops working, and the gain is adjusted by the attenuator network.