A Broadband Limiting Amplifier Circuit
A technology of limiting amplifiers and circuits, applied in amplifiers, improving amplifiers to expand bandwidth, improving amplifier input/output impedance, etc., can solve the problems of reducing circuit area and large area
Active Publication Date: 2021-06-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0009] Aiming at the above-mentioned problems that the traditional broadband limiting amplifier is difficult to apply in the low voltage domain and has a large area, the present invention proposes a broadband limiting amplifier circuit, which has a good effect of expanding the bandwidth and does not waste additional voltage margin , can work at low power supply voltage, and at the same time use the source follower connected in series with the resistor instead of the inductance device to provide a high frequency zero point, thus reducing the circuit area
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[0031] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment;
[0032] The broadband limiting amplifier circuit proposed by the present invention is a three-stage operational amplifier, such as image 3 As shown, the first-stage operational amplifier includes a first NMOS transistor M1, a second NMOS transistor M2, a first PMOS transistor M3, a second PMOS transistor M4, and a first current source I1. The gate of the first NMOS transistor M1 serves as a bandwidth limiter The positive input terminal of the amplitude amplifier circuit, its drain is connected to the drain of the second PMOS transistor M4, its source is connected to the source of the second NMOS transistor M2 and grounded after passing through the first current source I1; the second NMOS transistor M2 The gate serves as the negative input terminal of the broadband limiting amplifier circuit, and its drain is connected to the drain of the first PMOS tran...
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A broadband limiting amplifier circuit belongs to the technical field of analog integrated circuits. Including the first-stage operational amplifier, the second-stage operational amplifier and the third-stage operational amplifier, the first NMOS transistor and the second NMOS transistor in the first-stage operational amplifier are input pair tubes connected to the front-end small swing signal output, and the first PMOS transistor and the second PMOS tube are load tubes, and the differential output of the first-stage operational amplifier is respectively connected in series with the gate of the NMOS transistor of the source-follower structure in the second-stage operational amplifier through a polycrystalline resistor, and a high-frequency zero point is introduced into the signal path. The signal bandwidth is expanded, and the source follower reduces the output impedance, and the output pole is pushed to the high frequency; the third stage op amp amplifies the output signal of the previous stage op amp to a full-swing signal whose peak-to-peak value is equal to the power supply voltage. The present invention does not waste extra voltage margin while expanding the bandwidth, and can work in a low-voltage domain; and the present invention uses a source follower connected in series with resistors instead of an inductive device to provide a high-frequency zero point, thereby reducing circuit area and saving chip area ; The present invention can also superimpose other techniques for expanding the bandwidth.
Description
technical field [0001] The invention belongs to the technical field of analog integrated circuits and relates to a broadband limiting amplifier circuit, in particular to a broadband limiting amplifier circuit which does not use passive inductance and can be applied in a low voltage domain. Background technique [0002] The broadband limiting amplifier is usually used to amplify the input small swing signal to the full rail. For the broadband limiting amplifier, the most typical structure is the Cherry-Hopper amplifier, which is characterized by the use of local parallel negative feedback technology to improve the two The frequency response of the stage amplifier, the traditional Cherry-Hooper amplifier such as figure 1 As shown, the bandwidth is extended by introducing resistor negative feedback. However, the defect of this structure is also very obvious, the tail current flows through the feedback resistor R F and load resistor R D , consumes a large amount of voltage ma...
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IPC IPC(8): H03F1/42H03F1/56
CPCH03F1/42H03F1/565
Inventor 于奇王源胡远冰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA