Self-balancing bridge circuit for millimeter wave power meter
A bridge circuit and power meter technology, which is applied in the direction of electric power measurement by thermal method, AC/DC measurement bridge, etc., to achieve the effect of convenient parameter adjustment
Pending Publication Date: 2020-12-11
NAT INST OF METROLOGY CHINA
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[0005] The purpose of the present invention is aimed at the existing self-balancing bridge circuit for millimeter-wave power meters, and the present invention solves the closed-loop control problem of the power meter connected to the side thermal thermistor power sensor for millimeter-wave power meters self-balancing bridge circuit
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[0013] The following is a clear and complete description of the technical solutions of the various embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0014] Such as figure 1 As shown, the present invention includes a reference resistor Rt900 and a thermistor 102, including a comparison module, the reference resistor Rt900 and the thermistor 102 are respectively connected to the comparison module, and the thermistor 102 is arranged on the millimeter wave power meter chip It is used to detect the operating temperature of the chip, and the comparison module includes a first operational amplifier U101, a first diode D101, a first triode Q101, a second operational amplifier...
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The invention discloses a self-balancing bridge circuit for a millimeter wave power meter. The circuit comprises a reference resistor, a thermistor, and a comparison module. The reference resistor andthe thermistor are connected with the comparison module, and the thermistor is disposed on a millimeter-wave power meter chip and is used for detecting a working temperature of the chip. The comparison module comprises a first operational amplifier, a first diode, a first triode, a second operational amplifier, a second diode and a second triode, the reference resistor and the thermistor are connected through four wires, two wires are used for providing a loop current, and the other two wires are used for measuring a voltage at two ends of the resistor. Therefore, an influence caused by leadresistance is reduced to be negligible, parameters are convenient to adjust, a balance speed is changed only by changing a capacitance, and other capacitance and inductance do not need to be adjusted.
Description
technical field [0001] The invention belongs to the technical field of electric bridge circuits, and relates to a self-balancing electric bridge circuit for a millimeter wave power meter. Background technique [0002] With the widespread application of mmWave technology, the need for accurate measurement of mmWave power becomes more urgent. Millimeter wave power measurement technology can be mainly divided into two types: diode detection and calorimetry. The detector-type power meter can quickly measure the millimeter-wave power, but limited by its working principle, it cannot be accurately calibrated by the calorimetric reference. [0003] The thermistor in the sensor of the calorimetric millimeter-wave power meter does not directly absorb the millimeter-wave power. The absorbing material on the chip absorbs the millimeter-wave, causing the temperature of the chip to rise, and the resistance of the thermistor on the circuit layer will change accordingly. Change, this type...
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Login to View More IPC IPC(8): G01R17/10G01R21/02
CPCG01R17/10G01R21/02
Inventor 袁文泽丁晟谷若晨崔孝海吴昭春赵巍刘潇蒙丁建新
Owner NAT INST OF METROLOGY CHINA