Transmitter drive circuit and method

Abstract

The present invention provides a drive circuit and method for a sending end, including: a calibration control unit that generates a calibration control signal that varies with the process, power supply voltage or temperature; a current calibration unit that generates a calibration current based on the calibration control signal; generates a bias based on the calibration current A bias voltage generation unit for the voltage; an output stage drive unit for amplifying the output signal based on the bias voltage; and an impedance matching unit for adjusting the output impedance based on the calibration control signal. Generate a calibration control signal; generate a calibration current based on the calibration control signal to obtain a bias voltage; amplify the signal to be output under the action of the bias voltage, and obtain a stable output signal through impedance matching. The present invention effectively reduces the current and resistance changes caused by process, power supply voltage and temperature changes, meets the requirements of the HDMI2.0 protocol for output voltage amplitude changes at the sending end, achieves better impedance matching effects, and effectively improves signal transmission quality .

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a sending end driving circuit and method. Background technique [0002] The driver is the key module of the sending end, which is located at the back end of the sending end. It is generally used in high-speed serial data interface circuits to send the parallel-to-serial conversion data at the sending end to the receiving end with a large driving capacity, and then can transmit data over long distances. [0003] The rapid development of the all-digital audio and video market continues to promote the high-definition multimedia interface (High Definition Multimedia Interface, HDMI) to the direction of high speed, high integration, low power consumption, and low cost. Therefore, more and more chips use low-cost and relatively Mature and reliable CMOS process design and implementation. HDMI can send audio and video signals at the same time, and is widely used in set-top boxes, DVD ...

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a driving circuit and method for the transmitting end, which is used to solve the problem of large fluctuations in the built-in impedance matching resistance of the HDMI2.0 driver circuit and relatively large fluctuations in the driver output current in the prior art major issues

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