Level converter with adjustable loss

Abstract

The invention provides an adjustable loss level converter, which belongs to the field of high-speed signal transceivers and comprises an input Gm network, a Gm control network and a tail current network. The input Gm network is used for converting a received input voltage signal into a current signal and outputting a first current; the Gm control network is used for adjusting the magnitude of the second current by controlling the voltage VCT, so that the equivalent transconductance value input into the Gm control network is changed, and the magnitude of the loss input into the Gm network is controlled; the tail current network is used for providing static working current. According to the invention, an additional level conversion circuit and an output impedance and common mode point stabilizing circuit can be omitted, the circuit stage number of the transceiver is simplified, and the cascade bandwidth is further improved.

Description

technical field [0001] The invention belongs to the field of high-speed signal transceivers, and more specifically relates to an adjustable loss level converter. Background technique [0002] With the rapid development of communication technology, the radio frequency transceiver components used in modern ultra-wideband communication systems will directly affect the speed, capacity, transmission distance and power consumption of the entire system, which puts forward the system structure and specific circuit design of the transceiver. new challenge. Traditional broadband transmitter circuits usually use Gilbert unit as the gain control circuit of the variable gain amplifier. Since the Gilbert unit needs to stack multiple transistors, its output common-mode point is high, so an additional common-mode level is required The conversion circuit is inserted between the variable gain amplifier and the output driver, which increases the complexity of the circuit structure. [0003] ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide an adjustable loss level shifter, aiming at solving the problem that the common mode point of the existing transceiver is high, and an additional level shifting circuit usually needs to be inserted into the variable gain amplifier and the output driver, which makes the circuit structure extremely complicated

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