Ultra wide band transmitter based on circuit timing

Abstract

The invention discloses an ultra wide band transmitter based on circuit timing, comprising: a narrow pulse generator used for generating a narrow pulse envelope; a high-frequency annular voltage-controlled oscillator which is used for generating a carrier signal; and a charge pump phase-locked loop which is used for generating a system clock and a control voltage, wherein the pulse width of the narrow pulse generator and the oscillation frequency of the high-frequency annular voltage-controlled oscillator are both controlled by the control voltage of the charge pump phase-locked loop. According to the invention, the phase-locked loop can indirectly lock the oscillation frequency of the ring voltage-controlled oscillator outside the loop and the pulse width of the narrow pulse generator while locking the oscillation frequency of the voltage-controlled oscillator in the loop, so that the transmitter can effectively resist the influence caused by process deviation, power supply voltage change and the like, the robustness of the transmitter is greatly improved, and the stability of the frequency of the transmitted pulse waveform and the pulse width can be well maintained; and therefore, the ultra-wideband transmitter can accurately generate nanosecond or even picosecond-level pulses.

Description

technical field [0001] The invention relates to the field of integrated circuit design, in particular to the design of an ultra-wideband radio frequency transmitter. Background technique [0002] The pulse width of ultra-wideband signals is extremely narrow, and the duration is on the order of nanoseconds or even picoseconds. To generate accurate and controllable ultra-wideband transmission signals, there are high requirements for the design of ultra-wideband narrow pulse generators. In the early ultra-wideband communication, most of the ultra-wideband pulse signals without carrier were used, and some Gaussian high-order pulse generators based on step recovery diodes and high-order filters appeared in this stage. Later, in order to prevent the ultra-wideband transmission signal from interfering with other wireless signals in the frequency band, there was a higher requirement for the controllability of the working frequency of the ultra-wideband transmission signal. In order...

AI Technical Summary

Problems solved by technology

In this structure, in the circuit design of each module of the UWB transmitter based on local oscillator frequency conversion, the narrow pulse generator is generated through a series of digital circuit logic delays, due to factors such as power supply voltage, process deviation, and ambient temperature. The delay of digital gate circuits including NAND gates, inverters, etc. will change. Therefore, the pulse width output by the narrow pulse generator and the carrier frequency output by the high-frequency ring voltage-controlled oscillator that generates the carrier are prone to drift

In the application process, in order to meet the design requirements, it is necessary to continuously and dynamically adjust the control voltage of the voltage-controlled oscillator and the narrow pulse generator. This process is cumbersome and uncertain

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