Ultra-wide band transmitter and design method thereof

Abstract

The invention relates to an ultra wide band transmitter and a design method thereof. The transmitter uses current as a carrier of signals, adopts a zero intermediate frequency structure, and consists of modules such as an IQ two-path current top-shaped digital-to-analog converter with high sampling rate, an IQ two-path current type low-pass reconstruction filter, an IQ two-path current type upperfrequency mixer, a controllable gain radio-frequency amplifier, and the like. The digital-to-analog converter converts signals from a digital baseband into corresponding current signals, then analog baseband signals are reconstructed from the current signals by the low-pass filter, and the signals directly are sent to the current type frequency mixer to finish modulation and upper frequency mixing and finally are amplified by the radio-frequency amplifier and transmitted to the outside by antennas; the transmitter simplifies the structure and is beneficial for improving the linearity degree of the system and reducing the power consumption. The transmitter is designed by adopting an on-chip integrated digital-to-analog converter, and has great advantage in low voltage and high frequency design owning to the collaborative design among the modules.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuit design, and in particular relates to a transmitter applied to multiband orthogonal frequency-division multiplexing (MB-OFDM UWB) and a design method thereof. Background technique [0002] With the continuous growth of people's demand for various data exchanges (for example: data exchange between mobile phones, MP3 / 4, digital cameras, etc. and computers), wired data exchange has shown its own limitations: various Conversion sockets, a large number of connections and plugging operations, etc., all bring a lot of inconvenience to wired data transmission. With the progress of integrated circuit manufacturing process and the development of communication technology, high-speed wireless data transmission becomes possible. In recent years, various wireless data transmission and communication technologies have been greatly developed, such as 3G, IEEE802.11a / b / g, WiMax and UWB, and other w...

AI Technical Summary

Problems solved by technology

[0002] With the continuous growth of people's demand for various data exchanges (for example: data exchange between mobile phones, MP3 / 4, digital cameras, etc. and computers), wired data exchange has shown its own limitations: various Conversion sockets, a large number of connections and plugging operations, etc., all of which have brought a lot of inconvenience to wired data transmission

[0005] There are many defects in the voltage mode transmitter: on the one hand, because the carrier of the signal of the voltage mode transmitter is voltage, and the output of the general high-speed digital-to-analog converter is a current signal, so it is necessary to add a resistance to the output of the DAC. Convert current signal to voltage signal

That is, the linearity of the voltage-mode transmitter is then limited by the V2I unit

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