5results about How to "Large tuning range" patented technology

The invention discloses an adjustable MMIC band-pass filter based on a tap inductance technology. The adjustable MMIC band-pass filter comprises a radio frequency input end, a radio frequency output end, a low-pass filter circuit and an adjustable band-pass filter circuit, wherein the low-pass filter circuit and the adjustable band-pass filter circuit are connected between the radio frequency input end and the radio frequency output end in series; the low-pass filter circuit comprises first to third capacitors and an inductor; the adjustable band-pass filter circuit comprises a first network, a second network, a third network, a fourth network, a fifth adjustable capacitor and a sixth adjustable capacitor; one end of the inductor is connected with the radio frequency input end, and the other end of the inductor is coupled with the first network; the first network and the second network are coupled through a fifth adjustable capacitor, the second network and the third network are coupled through a tap inductor, the third network and the fourth network are coupled through a sixth adjustable capacitor, and the fourth network is connected with a radio frequency output end. Compact magnetic coupling is achieved through the tap inductance technology, insertion loss and the chip area are remarkably reduced, and meanwhile the wide tuning range and high harmonic suppression are achieved.

This invention discloses a reconfigurable multi-mode ring oscillator, relating to the field of radio frequency integrated circuit design technology. The reconfigurable multi-mode ring oscillator includes multiple delay units and a switching network. The switching network is used to dynamically reconfigure the connection topology of the multiple delay units to switch between three modes. In the first mode, the switching network connects all delay units end-to-end to form a 6-stage ring oscillator. In the second mode, the switching network divides the multiple delay units into two parallel 3-stage sub-loops, and the corresponding core nodes of the two 3-stage sub-loops are coupled to each other through the switching network. In the third mode, the switching network divides the multiple delay units into three parallel 2-stage sub-loops, and the corresponding core nodes of the three 2-stage sub-loops are coupled to each other through the switching network. This provides a novel ring oscillator structure that can increase the tuning range and effectively suppress noise.

This invention provides a wide-tunable single-mode emitting semiconductor laser, comprising: a semiconductor substrate, a first linear ridge waveguide forming a first coupling cavity, and a second linear ridge waveguide forming a second coupling cavity, wherein the first coupling cavity is separated from the second coupling cavity by a gap. The first and second coupling cavities respectively include p-contacts and n-contacts for allowing laser currents I1 and I2 to be injected into the first and second coupling cavities. The first and second coupling cavities respectively include a first heating resistor and a second heating resistor, which are used to heat the first and second coupling cavities respectively when heating currents H1 and H2 are applied to them. The heating resistors are provided for heating the semiconductor substrate of the semiconductor laser to regulate the base temperature of the chip (i.e., the semiconductor substrate). T .

This invention discloses a distributed LC resonant network Ku-band on-chip tunable low-pass filter. The filter includes an RF signal entering from port 1, flowing sequentially through five high-impedance microstrip lines. These five transmission lines are equivalent to five series inductors at high frequencies. At the nodes of adjacent microstrip lines, four high-impedance microstrip lines and four sets of capacitor switch arrays are connected in parallel. Each high-impedance microstrip line with a series capacitor switch array forms a parallel resonant circuit to ground. Two low-impedance open-circuit microstrip lines are connected in parallel at the input and output ports, respectively. The parasitic capacitance generated at high frequencies is used for impedance matching of the filter. The overall topology is equivalent to an eleventh-order Chebyshev low-pass filter. Compared to existing tunable on-chip low-pass filters, this invention's low-pass filter achieves adjustable cutoff frequency across the entire Ku-band, providing a wide tuning range while ensuring excellent overall performance such as high frequency selectivity, low loss, sufficient out-of-band rejection, and miniaturization.