CMOS instrument amplifier based on current feedback
An instrumentation amplifier and current feedback technology, which is applied to DC-coupled DC amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers, etc., can solve the problem of circuit CMRR reduction and other problems, and achieve improved common-mode rejection ratio and low power consumption , The effect of fewer circuit branches
Inactive Publication Date: 2017-07-04
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
This structure sets the gain through the capacitance ratio, and uses MOS pseudo-resistor technology to suppress the DC signal. However, in this structure, the mismatch of the input passive components caused by the process error will reduce the CMRR of the circuit.
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[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0019] The CMOS instrumentation amplifier provided by the present invention makes the gain of the amplifier determined by the resistance ratio through the current feedback mode; the capacitive coupling structure is discarded, the influence of input capacitance mismatch is eliminated, and the common mode rejection ratio of the amplifier is greatly improved. The problem of DC signal suppression caused by the input capacitor is removed, and a separate feedback loop is added in practical applications to solve it.
[0020] The CMOS instrumentation amplifier provided by the present invention can be a...
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The invention discloses a CMOS instrument amplifier based on current feedback. The CMOS instrument amplifier comprises a PMOS tube M1, a PMOS tube tube M6, a first current mirror, a second current mirror, an NMOS tube M2, an NMOS tube M3, an NMOS tube M4, an NMOS tube M5, a capacitor Cc1, a capacitor Cc2, a resistor R1, a resistor R2, a current source I1, a current source I2, a current source I3, a current source I4, a current source IC1 and a current source IC2; and the first current mirror comprises a PMOS tube M7 and a PMOS tube M8, and the second current mirror comprises a PMOS tube M9 and a PMOS tube M10. By adoption of the CMOS instrument amplifier disclosed by the invention, no input coupling capacitor is used, thereby eliminating the influence caused by the mismatch of the input coupling capacitor and improving the common mode rejection ratio of the amplifier; as a fully differential structure is adopted, the common mode rejection ratio is further improved; and the circuit branches are few, thereby realizing low power consumption.
Description
Technical field [0001] The invention belongs to the field of analog integrated circuits, and more specifically, relates to a CMOS instrumentation amplifier based on current feedback. Background technique [0002] Human-machine interface technology is a hot research field at the moment. People hope that by analyzing the laws and characteristics of bioelectric signals, they can recognize people's intentions and turn thoughts into actions. In terms of medical treatment, recording and analyzing bioelectrical signals can also provide a certain diagnostic basis for clinical medication. [0003] Accurate collection of bioelectric signals is the basis of man-machine interface technology. Bioelectric signals are typical low-frequency and weak-amplitude electric signals, and are easily interfered by external noise during the collection process. In order to achieve multi-electrode, wearable, and implantable applications, the signal acquisition circuit must have sufficiently low power consu...
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IPC IPC(8): H03F1/02H03F3/45
CPCH03F1/0211H03F3/45641H03F2203/45014H03F2203/45031H03F2203/45084H03F2203/45156H03F2203/45201
Inventor 邹志革徐博汪少卿雷鑑铭邹雪城
Owner HUAZHONG UNIV OF SCI & TECH