RSSI circuit used for transimpedance amplifier
A technology of transimpedance amplifier and operational amplifier, applied in amplifiers, differential amplifiers, amplifiers controlled by light, etc., can solve the problem that the transimpedance amplifier TIA cannot accurately monitor the photodiode current signal and so on.
Active Publication Date: 2017-07-07
FENGHUO COMM SCI & TECH CO LTD
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to solve the problem that the existing transimpedance amplifier TIA cannot accurately monitor the current signal converted by the photodiode
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Embodiment Construction
[0023] The present invention provides a circuit for indicating the strength of the received signal when the receiving end of the optical module performs photoelectric conversion, that is, the RSSI circuit, which has the following characteristics:
[0024] 1. Using pure CMOS (Complementary Metal Oxide Semiconductor) technology to integrate in the transimpedance amplifier TIA, the cost is low and the integration is high;
[0025] 2. A special circuit design is adopted to realize high-precision current mirroring, which can accurately mirror the DC signal in the current signal converted by the photodiode, and control the deviation of the current indication within 0.3%, which is convenient for optical modules. manufacturer's application.
[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0027] An embodiment of the present invention provides an RSSI circuit for a transimpedance amplifier, such ...
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The invention discloses an RSSI circuit used for a transimpedance amplifier. The RSSI circuit is integrated in the transimpedance amplifier and comprises first and second voltage follower, wherein the first voltage follower comprises a first operational amplifier and a first PMOS tube; the second voltage follower comprises a second operational amplifier, a resistor R and second, third and fourth PMOS tubes; the voltage of a drain of the third PMOS tube is the same as the voltage of an inverted input end of the second operational amplifier; the voltage of the inverted input end of the second operational amplifier and the voltage of the drain of the first PMOS tube are locked to reference voltage as power supply voltage of a photodiode; grids of the first and third PMOS tubes are connected and sources of the first and third PMOS tubes are connected to a power supply; and after accurate mirroring is carried out on a DC signal in a current signal converted by the photodiode through the RSSI circuit, the DC signal is output from the drain of the third PMOS tube. The RSSI circuit has lower cost and high integration level, and the accurate mirroring output can be carried out on the direct current converted by the photodiode to be convenient for application of an optical module manufacturer.
Description
technical field [0001] The invention relates to the field of analog integrated circuit design, in particular to an RSSI (signal strength indication) circuit for a transimpedance amplifier. Background technique [0002] In an optical communication system, in order to ensure the reliability of optical signal transmission and reception, analog quantities such as received optical power, transmitted optical power, and bias current of the optical module need to be monitored. By monitoring the received optical power, the intensity of the received optical signal can meet the receiving requirements, avoiding bit errors caused by too large or too small optical power, and even affecting the life of the receiving optical module. [0003] Transimpedance amplifier (TIA) is the main chip of the optical receiving front end in the field of optical communication. Its function is to amplify the weak current signal (AC signal) converted by the photodiode to a suitable voltage range. Considerin...
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IPC IPC(8): H03F3/08H03F3/45
CPCH03F3/082H03F3/087H03F3/45475
Inventor 程妮
Owner FENGHUO COMM SCI & TECH CO LTD