Current signal detection circuit, TIA circuit and optical signal receiving front end
A current signal detection and current signal technology, applied in the direction of improving amplifiers to reduce temperature/power voltage changes, electrical components, DC-coupled DC amplifiers, etc., can solve problems such as malfunctioning, TIA circuit instability, and current detection technology that cannot be linear Accurately reflect the size of the input current signal and other issues, to achieve the effect of solving nonlinear and unstable problems and improving the overall solution
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Embodiment 1
[0046] Embodiment 1 provides a current signal detection circuit, such as figure 2 shown, including: current sense resistor ( figure 2 R in det21 ), current mirror resistor ( figure 2 R in det22 ), the first mean detector ( figure 2 The Average Detector21 in), the second average detector ( figure 2 The Average Detector 22), the first voltage regulator ( figure 2 Regulator21 in), the second regulator ( figure 2 Regulator 22 in), the first PMOS tube ( figure 2 PM21 in ).
[0047] Input current signal I IN While connecting the current sense resistor R det21 and the left port of the first mean detector (this node is V RL ); the current sense resistor R det21 The right port of is connected to the left port of the second mean value detector (this node is V RR ); the right port of the first mean value detector (node V RL_AVG ) is connected to the input (IN) of the first voltage regulator; the right port (node V RR_AVG ) is connected to the input terminal (IN) of the ...
Embodiment 2
[0066] Based on the current signal detection circuit provided in Embodiment 1, Embodiment 2 provides a TIA circuit, see Figure 6 , including: current signal detection circuit ( Figure 6 Current Detector in), TIA module ( Figure 6 TIA Circuit in).
[0067] Wherein, the function of the current signal detection circuit is to detect the input current I in real time IN size, and output the corresponding detection current I MON_OUT , provided to the TIA module to complete the gain control operation.
[0068] The function of the TIA module is to first input the current signal I IN The single-ended voltage signal is converted, and then the single-ended voltage signal is converted into a differential voltage signal, and the differential voltage signal is amplified to the order of hundreds of mV and output as a differential port (OUTP, OUTN). The TIA module is also based on the detected current signal I MON_OUT Adjust the transimpedance gain.
[0069] That is, I in the present...
Embodiment 3
[0072] Based on the current signal detection circuit provided in Embodiment 1, Embodiment 3 provides an optical signal receiving front end, such as Figure 6 shown, including: photodetector ( Figure 6 PD in), the current signal detection circuit ( Figure 6 Current Detector in), TIA module ( Figure 6 TIA Circuit in).
[0073] Wherein, the function of the photodetector is to convert the input light signal into the input current signal I IN .
[0074] The function of the current signal detection circuit is to detect the input current I in real time IN size, and output the corresponding detection current I MON_OUT , provided to the TIA module to complete the gain control operation.
[0075] The function of the TIA module is to input the current signal I IN Convert the voltage signal, and convert this single-ended voltage signal into a differential voltage signal, and at the same time, amplify the differential voltage signal to the order of hundreds of mV and output it in...
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