Trans-impedance amplifier

Abstract

The invention discloses a common-gate input type low-power-consumption trans-impedance amplifier and belongs to the field of integrated circuits. The amplifier is a differential input / output structure and comprises common-gate input levels, load levels and feedback levels. Radio frequency differential signals V<in+ / -> are input through the source ends of the common-gate input levels, are converted into signal currents, are further converted into voltage signals at the load levels and finally form output differential signals V<out+ / ->. The output voltage signals are sampled by the feedback levels and are fed back to the source ends of the common-gate input levels, thereby improving equivalent input transconductance. The common-gate input levels adopt capacitor cross-coupling modes, so that the equivalent input transconductance is further improved. According to the trans-impedance amplifier, the high-performance trans-impedance amplifier can be realized with relatively low power consumption.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a design technology of a transimpedance amplifier. Background technique [0002] Currently, software radio technology compatible with multiple protocols is becoming more and more important. Correspondingly, the research and development of broadband radio frequency transceiver technology has become increasingly urgent. For a long time in the past, circuit designers have been accustomed to using voltage signal variables to analyze and characterize the characteristics of circuits, which is a concept of circuit design technology based on voltage modulus. In recent years, the potential advantages of current-mode circuits in analog / mixed-signal processing are gradually being tapped, and rapidly promote the development of circuit design techniques based on current-mode operations. At present, many breakthroughs have been made in the research of circuits operating in current mode in ...

AI Technical Summary

Problems solved by technology

[0005] Combining the above two transimpedance amplifier structures, we can see that the op amp-based transimpedance amplifier has a large open-loop gain, but the bandwidth will be limited

The common-gate input structure is simple, but in order to reduce the input resistance, it means that the device must have a large size, or consume a large power consumption to obtain a high transconductance equivalently, which is necessary for high-performance integrated circuits. Avoided

Especially for the high bandwidth requirements of the baseband data rate, the circuit design requirements become more stringent

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