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Transimpedance Amplifier and Its Current-to-Voltage Method

A technology of transimpedance amplifiers and amplifiers, which can be applied to amplifiers, amplifiers controlled by light, amplifiers with only semiconductor devices, etc., and can solve the problems of the 100 gain limit of transimpedance amplifiers

Active Publication Date: 2016-04-13
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To summarize the above, based on the limited voltage margin, the gain of the transimpedance amplifier 100 is strictly limited, because when trying to increase the speed of the transimpedance amplifier 100, the voltage margin occupied by the load circuit 130 is proportional to the bias current Ib

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  • Transimpedance Amplifier and Its Current-to-Voltage Method

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Embodiment Construction

[0069] Different embodiments are given below to describe the content of the present invention in detail, and the drawings are used as auxiliary descriptions. Embodiments of the invention have been described in sufficient detail for one of ordinary skill to practice these or other embodiments. Different embodiments are not necessarily independent of each other, and some embodiments can be combined with one or more other embodiments to form new embodiments. Therefore, the following detailed description is not intended to limit the present invention.

[0070] Figure 2A It is a transimpedance amplifier 200A according to an embodiment of the present invention. The transimpedance amplifier 200A receives a current input at the first circuit node 201 and outputs a voltage output at the second circuit node 202 . The transimpedance amplifier 200A includes a common gate amplifier 220 . In one embodiment, the common gate amplifier 220 includes an NMOS (N-channel Metal Oxide Semicondu...

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Abstract

The invention discloses a transimpedance amplifier and its current conversion voltage method. The transimpedance amplifier comprises: a common gate amplifier to receive the first current from the first circuit node and output the second node; and coupled to the second node The load circuit includes a diode-connected MOS (Metal Oxygen Semiconductor Field Effect Transistor), and the transimpedance amplifier also includes a bias circuit to output a substantially constant current to the first circuit node.

Description

technical field [0001] The invention relates to a transimpedance amplifier and a current conversion voltage method thereof. Background technique [0002] Transimpedance amplifiers (TIA, transimpedance amplifiers) are widely used in optical communications. A transimpedance amplifier accepts a current-mode input signal and outputs a voltage-mode signal. Existing transimpedance amplifiers 100 such as figure 1 shown. The transimpedance amplifier 100 includes a bias circuit 110 including a current source 111 to generate a substantially constant current Ib flowing from the circuit node 101 to the circuit node VSS; a common gate amplifier 120 including an NMOS (shortforn-typemetal-oxidesemiconductorfieldeffecttransistor, NMOS type channel metal oxide semiconductor field effect transistor) 121, wherein the gate terminal is coupled to the bias voltage VB, the source terminal is coupled to the circuit node 101, and the drain terminal is coupled to the circuit node 102; and a load c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/08H03G3/20
CPCH03F3/082
Inventor 林嘉亮
Owner REALTEK SEMICON CORP