Second order trans-resistance amplifier
A technology of transimpedance amplifiers and resistors, applied in the field of second-order transimpedance amplifiers, can solve the problems that the order of the post-stage filter cannot be alleviated, and the power consumption of the system cannot be reduced, so as to alleviate the pressure of the order, increase the frequency selection characteristics, and increase the power consumption of the system. Effect of large roll-off coefficient
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[0014] The present invention will be further explained below in conjunction with the accompanying drawings.
[0015] Such as figure 1 As shown, the present invention provides a second-order transimpedance amplifier, including a first-stage circuit 1, a second-stage circuit 2 and a capacitive coupling circuit 3, and the first-stage circuit 1 and the second-stage circuit 2 are performed by the capacitive coupling circuit 3. connection, the first stage circuit 1 and the second stage circuit 2 are symmetrical circuit structures. Both the first-stage circuit 1 and the second-stage circuit 2 use the low-impedance nodes of the super source follower to construct a virtual point, and at the same time use the differential pair to construct an AC virtual point, and isolate the first-stage circuit 1 and the second-stage circuit through a capacitive coupling circuit 3 2 DC operating point to achieve second-order filtering.
[0016]Wherein, the first stage circuit 1 includes PMOS transist...
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