A High-Gain Ultra-High Operating Speed ​​Amplifier Circuit

Abstract

The invention discloses a high gain ultra high working rate amplifier circuit. The high gain ultra high working rate amplifier circuit comprises a transconductance enhancement circuit used for increasing the gain, a resistance increasing technology circuit used for increasing the load resistance value, a cross coupling circuit used for expanding the bandwidth, a current mirror and a wake power supply; the internal devices are made up of nine transistors, two capacitors, two resistors, and two current sources definitely. According to the invention, the gain is increased through increasing the transconductance of the main amplifying tube by means of the transconductance enhancement technology made up of MOS devices, therefore, the bandwidth of the circuit is not affected; meanwhile, the gainis increased by paralleling an MOS tube on the load resistor through the resistance increasing technology, therefore, the voltage margin of the output signal is not reduced; and the effect of the stray capacitance between the gate and the drain of the MOS tube is eliminated by means of the cross coupling capacitance technology, therefore, the bandwidth is expanded, and the amplifier circuit withhigh gain and ultra high working rate is formed, which is simple in structure and very beneficial to integration.

Description

technical field [0001] The invention relates to a high-gain ultra-high working rate amplifier circuit, which belongs to the technical field of optical fiber communication integrated circuits. Background technique [0002] Optical fiber communication is a high-tech communication method that uses light waves as information carriers and optical fibers as transmission media. Compared with other communication methods, it has the advantages of wide frequency band, large capacity, low loss, anti-interference, anti-radiation, etc., and is widely used in modern network and multimedia communication. At the front end of the optical fiber is the optical receiving end, which is composed of optical detectors, preamplifiers, limiting amplifiers and clock recovery circuits. The role of the optical receiving end is to convert the received optical signal into an electrical signal through the photodetector, and through the preamplifier and limiting amplifier, the received weak signal is suffi...

AI Technical Summary

Problems solved by technology

[0006] the above figure 1 As shown in the application to increase the gain circuit, the cascode technology is to superimpose a layer of transistors in a single-stage circuit to increase the gain. This technology limits the swing of the output signal, and because the output resistance of the output node increases, the reduction The bandwidth of the circuit is reduced

[0007] the above figure 2 As shown in the application of the bandwidth expansion circuit, the passive inductor occupies a large area, which greatly increases the chip manufacturing cost, and for the high-gain multi-stage amplifier circuit or multi-channel parallel optical transceiver circuit, due to the chip area, The number of passive inductors cannot be increased without limit

[0008] The circuits disclosed in the Chinese invention patents "Low Power Consumption Bandwidth Multiplication Operational Amplifier Realized by MOS Devices" (201110061084.6) and "A Gain-Boosted Operational Transconductance Amplifier" (201510631301.9) are both gain-boosting circuits composed of operational amplifiers , its shortcomings are: the bandwidth is not high, and the comprehensive performance of the circuit cannot meet the technical requirements of the amplifier required by modern optical fiber communication.

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