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A single-ended input, differential output conversion circuit

A differential output and conversion circuit technology, applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, etc.

Active Publication Date: 2022-07-08
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the embodiments of the present invention is that MOSFET is voltage-driven (gate / source voltage), while BJT tube is current-driven (base current, and the base current is amplified), which leads to the previous implementation of CMOS technology. Part of the client-side / access-side electrical chip architecture cannot be directly transplanted to the SiGe BiCMOS process

Method used

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  • A single-ended input, differential output conversion circuit
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  • A single-ended input, differential output conversion circuit

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Embodiment 1

[0062] Embodiment 1 of the present invention provides a single-ended input, differential output conversion circuit, such as figure 2 As shown, including a low-pass filter, a voltage regulator and a fully differential amplifier, the three are cascaded in turn, specifically:

[0063] A low-pass filter, used to filter the input signal IN, and output its average signal IN_AVG;

[0064] The voltage regulator is used to convert the average signal IN_AVG of the input signal into a stable voltage signal Reg_OUT. At the same time, the output terminal Reg_OUT of the voltage regulator also outputs the driving current, which is used to provide the base current to the BJT tube (it can also ensure the normal operation of the BJT tube). work); wherein, the base current of the BJT tube is controlled at the level of uA;

[0065] A fully differential amplifier for converting the input signal IN and the regulator output signal Reg_OUT into a pair of differential output signals OUTP and OUTN. ...

Embodiment 2

[0090] like Figure 5 Shown is another novel single-ended input, differential output conversion circuit structure proposed by the present invention, including an adjustable low-pass filter, a monitoring low-pass filter, a comparator and a fully differential amplifier. The input signal IN is connected to the input terminal of the adjustable low-pass filter, the input terminal of the monitoring low-pass filter, and one input terminal INN of the fully differential amplifier at the same time; the output terminal IN_AVG of the adjustable low-pass filter is simultaneously connected to the fully differential amplifier. The other input terminal INP of the amplifier and one input terminal of the comparator, the output terminal IN_AVG_MON of the monitoring low-pass filter is connected to the other input terminal of the comparator; the output terminal of the comparator is connected to the control of the adjustable low-pass filter The terminal Vrescap is used to adjust the adjustable resi...

Embodiment 3

[0097] like Image 6 (a), it is figure 1 (b) Transient simulation results of the single-ended input, differential output conversion circuit shown. Among them, IN represents the input signal, IN_AVG represents the output signal of the low-pass filter, OUTP and OUTN represent the forward output signal and the reverse output signal respectively; the transient simulation time length is 10us; the swing of the input signal IN is 300mVpp, the rate is 25Gbps. from Image 6 (a) It can be seen that after about 0.5us, the circuit enters a stable state.

[0098] like Image 6 (b), it is Image 6 A partial enlarged view of the simulation results shown in (a), is Image 6 A partial enlarged view of the transient time period (9.995us to 10us) in (a). The upper dark solid line is the input signal IN, the upper light dashed line is the output signal IN_AVG of the low-pass filter, the lower dark solid line is the forward output signal OUTP, and the lower light dashed line is the inverted...

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Abstract

The invention relates to the field of semiconductor integrated circuit technology and optical communication technology, and provides a single-ended input and differential output conversion circuit. The low-pass filter is used to filter the input signal IN and output its average signal IN_AVG; the voltage stabilizer is used to convert the average signal IN_AVG of the input signal into a stable voltage signal Reg_OUT, and the output terminal of the voltage stabilizer Reg_OUT also outputs drive current to provide base current to the BJT. A fully differential amplifier for converting the input signal IN and the regulator output signal Reg_OUT into a pair of differential output signals OUTP and OUTN. The present invention solves the problem that the current circuit structure based on CMOS technology, such as TIA, which involves single-ended-to-differential conversion cannot be directly applied to SiGe BiCMOS technology.

Description

【Technical field】 [0001] The invention relates to the field of semiconductor integrated circuit technology and optical communication technology, in particular to a single-ended input and differential output conversion circuit. 【Background technique】 [0002] In the past 30 years, the wireless communication network has experienced 1G (telephone voice communication era), 2G (voice and SMS era), 3G (voice, SMS, network era), 4G (voice, SMS, network, video, e-commerce era) , the optical fiber access network has also realized the technological innovation from telephone line access (Kbps rate) to copper line access (Mbps rate) to optical fiber access (Gbps), increasing the bandwidth rate of home users from the initial Kbps to Gbps. With the popularization and application of broadband services such as e-commerce, 4K / 8K video, Internet of Things, and cloud computing, as well as unmanned intelligent driving, virtual reality (Virtual Reality, abbreviated as VR), artificial intelligen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0185
CPCH03K19/0185
Inventor 余长亮
Owner FENGHUO COMM SCI & TECH CO LTD