Radio frequency modulation output circuit and gain compensation amplifier thereof

Abstract

The invention provides a radio frequency modulation output circuit, comprising: a first frequency mixer, a first amplifying circuit, a second frequency mixer, a second amplifying circuit and an output circuit, wherein the first frequency mixer is used for receiving a first input signal and a first carrier signal, and generating a first radio frequency modulation signal after frequency mixing of the signals; the first amplifying circuit is connected with the first frequency mixer, and is used for generating a first amplifying signal after amplifying the first radio frequency modulation signal; the second frequency mixer is used for receiving a second input signal and a second carrier signal, and generating a second radio frequency modulation signal after frequency mixing of the signals; the second amplifying circuit is connected with the second frequency mixer, and is used for generating a second amplifying signal after amplifying the second radio frequency modulation signal; and the output circuit is connected with the first amplifying circuit and the second amplifying circuit, and is used for adding the first amplifying signal and the second amplifying signal together and outputting the signal after addition. By using the radio frequency modulation output circuit provided by the invention, the isolation and linearity of the circuit can be improved, thereby stable gain within the whole wide band range can be ensured.

Description

technical field [0001] The invention relates to a radio frequency modulation output circuit and a gain compensation amplifier thereof. Background technique [0002] Many communication and instrumentation systems, such as TV transmitters, ultra-wideband wireless systems or other similar application systems, work in a wide frequency range, which means that the matching frequency band is 50% or greater of the center frequency. In a radio frequency transceiver system working in a wide frequency range, due to the existence of various parasitic capacitances and inductances in circuits at all levels, the performance of the system will be affected as the frequency increases. Therefore, it is necessary to add some high-bandwidth and low-cost circuits in the system to improve the performance of the system in the entire broadband range. [0003] figure 1 Shows a structural block diagram of a television radio frequency modulation system working in a wide frequency range in the prior a...

AI Technical Summary

Problems solved by technology

Although the above circuit structure can increase the operating frequency band of the circuit, it still cannot meet the requirements of low cost, high linearity and high isolation of high-performance radio frequency television transmitters

Images