The invention provides a bandgap reference voltage production circuit. The circuit comprises a first polar type transistor, a second polar type transistor, a MOS tube, a first to a fourth resistors; an offset voltage correction circuit comprises a second operational amplifier, a first capacitor, a second capacitor, a first to a fourth switches; a first end of the second switch is connected with asecond node through a first switch, and a second end thereof is connected with a third node; a third switch is connected between the second node and a second input end of the second operational amplifier; the fourth switch is connected between the third node and a first input end of the second operational amplifier; the first input end of the second operational amplifier is grounded through the first capacitor, the second input end thereof is grounded through the second capacitor, and the output end thereof is connected with a control end of the MOS tube; a first input end and a second input end of the operational amplifier are connected with the second end and the first end of the second switch, and the output end thereof is connected with the control end of the MOS tube. Compared with the prior art, the offset voltage correction circuit is added in the production circuit so as to correct the input offset voltage.

Bandgap reference voltage production circuit

The invention discloses an ultra-wideband microstrip band-pass filter. The band-pass filter comprises a low-pass filter which is formed through the cascade connection of three H-shaped defected micro-strip structures. A quarter-wavelength terminal short-circuit resonator is added respectively to micro-strip lines at the input and output ports of the low-pass filter. According to the invention, the relative bandwidth of the band-pass filter is 116%, and the -20dB high frequency stop-band of the band-pass filter is up to 7 GHz. Compared with other technical schemes in the prior art, corresponding data are much wider, while the size is smaller than those of other existing technical schemes. The ultra-wideband microstrip band-pass filter has the advantages of good overall performance, compact structure, small insertion loss, wide stop-band and the like. The ultra-wideband microstrip band-pass filter is very suitable for the design of high-density monolithic microwave integrated circuits.

Ultra-wideband microstrip band-pass filter

The invention discloses a millimeter wave power amplifier circuit comprising an interstage power division matching circuit used for dividing at least one amplified output power to acquire multiple output signals, and outputting the multiple output signals to the next stage of power amplification structure, wherein the interstage power division matching circuit comprises a microstrip line on whicha groove wire is formed. It can be known from the above content, according to the technical scheme provided by the invention, the groove wire is formed on the microstrip line of the interstage power division matching unit, and the slow-wave effect of the groove wire is used, so that under the same frequency, compared with the existing microstrip line, the microstrip line can be greatly reduced inlength, reduced in loss of the microstrip line while reduced in machining cost of the wafer, so that the current size can be reduced, and the parasitic effect appeared due to the bending of the microstrip line is avoided.

Millimeter wave power amplifier circuit

The invention relates to a method for numerical control of an output voltage of a low-voltage device The low-voltage device is provided with a body function module, a trimming circuit module and an operational amplification module; the body function module and the trimming circuit module are connected to the input end of the operational amplification module for operation The method comprises thestep that a digital adjustment variable delta trim is added into the trimming circuit module Furthermore, a digital compensation adjustment variable delta trim_offset is also added into the trimmingcircuit module According to the method for adjusting the output voltage of the low-voltage device by adding the digital adjustment variable into the low-voltage device, under the condition that thefunction of trimming the output voltage of the low-voltage device is achieved, more analog control circuits do not need to be added, and therefore, the layout size of a chip can still be achieved in asmall size space

Method for numerical control of output voltage of low-voltage device

The invention discloses a high-precision correcting circuit for a band-gap reference voltage source. The circuit includes an operational amplifier, a capacitor, a PMOS tube and a trimming circuit. The opposite phase end of the operational amplifier is connected with reference voltage VBG generated by the band-gap reference voltage source, the in-phase end of the operational amplifier is connected with a first terminal Vf of the trimming circuit, and the output end of the operational amplifier is connected with a first terminal of the capacitor and a grid electrode of the PMOS tube; a source electrode of the PMOS tube is connected with an electric source VDD, a drain electrode of the PMOS tube is connected with a second terminal of the capacitor and a second terminal Vtop of the trimming circuit, a third terminal V1.2 of the trimming circuit is output voltage after correcting, and a fourth terminal Vbottom of the trimming circuit is connected with the ground. According to the high-precision correcting circuit for the band-gap reference voltage source, a snubber circuit in the band-gap reference voltage source is integrated with the correcting circuit, errors caused by influences of process corners, imbalance, temperature and other factors in the reference voltage can be corrected, the influences caused by fine adjustment on the temperature features of the reference voltage can be eliminated and the load carrying capacity of the output voltage is improved. By adopting a digital trimming mode, the high-precision correcting circuit has the advantages of being flexible in correcting, high in precision, low in power consumption and small in area.

High-precision correcting circuit for band-gap reference voltage source

The utility model discloses an ultra -wideband micro -strip bandpass filter, band pass filter includes and cascades the low pass filter who constitutes by 3 H shape defect microstrip structure, the short circuit syntonizer of in addition quarter -wave termination respectively on low pass filter input, output port's microstrip line again. The utility model discloses a relative bandwidth has reached116%, 20dB high frequency stop band reaches 7GHz, and is wide more a lot of than the corresponding data of other prior art schemes, and the size is little than other also, advantages such as it can be good to have the wholeness, compact structure, insertion loss is little, the stop band is wide, the especially adapted design that is used for high density monolithic microwave integrated circuit.

Wang Bin

Papers

High-precision correcting circuit for band-gap reference voltage source

Ultra -wideband micro -strip bandpass filter

Ultra-wideband microstrip band-pass filter